Basilar part of occipital bone

Basilar part of occipital bone - Factbites
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Topic: Basilar part of occipital bone

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	Neck
		At the base of the occipital bone, at the basilar parts, the occipital bone is attached to the sphenoid bone.
		The large opening, or foramen magnum, in the occipital bone can be seen in the inferior view of the skull, and allows the nerves of the upper spinal cord to pass through the skull between the brain and the rest of the spinal cord.
		The teeth are mounted in the maxillary bone and the mandible, and are brought together for chewing by the hinge-like motion of the mandible (the lower jawbone).
	www.american.edu /adonahue/k10neck.htm (1586 words)

	Articulations of the Vertebral Column with the Cranium - Wikimd
		It is fixed, below, to the posterior surface of the body of the axis, and, expanding as it ascends, is attached to the basilar groove of the occipital bone, in front of the foramen magnum, where it blends with the cranial dura mater.
		307)]]—The alar ligaments are strong, rounded cords, which arise one on either side of the upper part of the odontoid process, and, passing obliquely upward and lateralward, are inserted into the rough depressions on the medial sides of the condyles of the occipital bone.
		[[Articulation of the Atlas with the Occipital Bone (articulatio atlantoöccipitalis)]]—The articulation between the atlas and the occipital bone consists of a pair of condyloid joints.
	www.wikimd.org /index.php?title=Articulations_of_the_Vertebral_Column_with_the_Cranium&printable=yes (783 words)

	Bones
		Located at the base of skull, Anterior to basilar part of Occipital Bone and back of the Ethmoid Bone.
		Meckle's Cave, a shallow fossa at the apex of petrous bone, for the Trigeminal Ganglion (Gasserian Ganglion).
		Frontal, Parietal (2), Temporal (2), Occipital, Sphenoid, Ethmoid, Maxilla (2), Zygomatic, Mandible, Lacrimal (2), Nasal (2), Palatine, Vomer, Palatine (2), Hyoid, and Inferior Nasal Conchae (2).
	www.uic.edu /depts/mcam/specialties/radiology/mafee (424 words)

	Sphenoid bone - Wikipedia, the free encyclopedia
		The sphenoid bone (os sphenoidale) is a bone situated at the base of the skull in front of the temporals and basilar part of the occipital.
		Medial to this is a triangular, serrated surface, for articulation with the frontal bone; this surface is continuous medially with the sharp edge, which forms the lower boundary of the superior orbital fissure, and laterally with the serrated margin for articulation with the zygomatic bone.
		By the twenty-fifth year the sphenoid and occipital are completely fused.
	en.wikipedia.org /wiki/Sphenoid_bone (2763 words)

	Occipital bone - Wikipedia, the free encyclopedia
		The occipital, like the other cranial the outer and inner tables, between which is the cancellous tissue or diploë; the bone is especially thick at the ridges, protuberances, condyles, and anterior part of the basilar part; in the inferior fossæ it is thin, semitransparent, and destitute of diploë.
		In the upper part of the internal occipital crest, a small depression is sometimes distinguishable; it is termed the vermian fossa since it is occupied by part of the vermis of the cerebellum.
		From this protuberance the upper division of the cruciate eminence runs to the superior angle of the bone, and on one side of it (generally the right) is a deep groove, the sagittal sulcus, which lodges the hinder part of the superior sagittal sinus; to the margins of this sulcus the falx cerebri is attached.
	en.wikipedia.org /wiki/Occipital_bone (2763 words)

	CATHOLIC ENCYCLOPEDIA: Human Race
		At the base of the skull measurements can be taken of the angle formed by the plane of the occipital foramen with the German horizontal plane, and of the angle formed by this German plane with the surface between the occipital foramen and the spheno-basilar joint.
		On this line Schwalbe traced the frontal angle (that between the tangent of the frontal bone at the glabella and the glabella-inion line), the bregman angle (bregma-glabella-inion); the lambda angle (lambda-inion-glabella); the opisthion angle (glabella-inion- opisthion; the opisthion is the posterior border of the occipital foramen).
		In the comparison of crania, especially of the ratios of angles, it is necessary to place the skull in a definite position.
	www.newadvent.org /cathen/12620b.htm (2763 words)

	Occipital bone - Wikipedia, the free encyclopedia
		The occipital, like the other cranial the outer and inner tables, between which is the cancellous tissue or diploë; the bone is especially thick at the ridges, protuberances, condyles, and anterior part of the basilar part; in the inferior fossæ it is thin, semitransparent, and destitute of diploë.
		The occipital bone, a bone situated at the back and lower part of the cranium, is trapezoid in shape and curved on itself.
		The superior angle of the occipital bone articulates with the occipital angles of the parietal bones and, in the fetal skull, corresponds in position with the posterior fontanelle.
	en.wikipedia.org /wiki/Occipital_bone (489 words)

	CHAPTER 42: THE SKULL AND HYOID BONE
		The basilar part and foramen magnum represent the body and vertebral foramen, respectively; the squamous part, with its external occipital protuberance and crest, perhaps represents the laminae and spinous process; and the condyles and jugular processes are in series with the articular and transverse processes, respectively.
		The groove between the petrous part of the temporal bone and the greater wing of the sphenoid bone is occupied in vivo by the cartilaginous part of the auditory tube.
		42-19 The" sphenoidal ridge" is the posterior border of the lesser wing of the sphenoid bone.
	www.dartmouth.edu /~humananatomy/part_8/chapter_42.html (6728 words)

	AANS.org Education and Meetings AANS Scientific Journals Neurosurgical Focus
		In six patients with basilar invagination the medulla oblongata was herniated, all three occipital enchondral parts (the basiocciput, exocciput, and supraocciput) were significantly smaller than in the control group, and the volume ratio was significantly larger than that in the Chiari group without basilar invagination.
		Basilar invagination is associated with a more severe downward herniation of the hindbrain due to the more severely underdeveloped occipital enchondrium, which further exacerbates overcrowding of the posterior cranial fossa.
		Of the six patients with basilar invagination, four in whom the sphenooccipital synchondrosis was identified on MR imaging had a significantly short basiocciput (Fig.
	www.aans.org /education/journal/neurosurgical/nov96/1-5-p1.asp (3812 words)

	Pathogenesis of Chiari malformation
		In the Chiari group (with and without basilar invagination), two embryogenic parts of the occipital bone (the exocciput and supraocciput) were significantly shorter than in the control group (Fig.
		The mean length of the basisphenoidal part in the Chiari group was 18.5 mm versus 20.6 mm in the control group; the mean length of the basioccipital portion in the Chiari group was 24.4 mm versus 28.1 mm in the control group and was even shorter in patients with basilar invagination at 20.8 mm (Fig.
		Basilar invagination is associated with a more severe downward herniation of the hindbrain due to the more severely underdeveloped occipital enchondrium, which further exacerbates overcrowding of the posterior cranial fossa.
	www.c3.hu /~mavideg/jns/1-5-p1.html (3812 words)

	Bioline International Official Site (site up-dated regularly)
		The exposure of the joint in cases with basilar invagination was significantly difficult as it was rostrally located in relationship to the occipital bone.
		Reduction of the atlantoaxial dislocation and of basilar invagination and stabilization of the region was achieved by placement of bone graft and metal spacers within the joint and direct inter-articular plate and screw method of atlantoaxial fixation.
		[13],[14],[15],[16],[17] Basilar invagination is commonly associated with atlantoaxial dislocation and the complex results in a significant degree of neck pain and myelopathy adding considerably to the disability secondary to affection of other joints.
	www.bioline.org.br /request?ni04111 (2582 words)

	Dorlands Medical Dictionary
		spheno-occipita´lis sphenooccipital fissure: the fissure between the basilar part of the occipital bone and the body of the sphenoid bone; called also basilar or occipitosphenoidal fissure.
		sphenopetro´sa [TA] sphenopetrosal fissure: a fissure in the floor of the middle cranial fossa between the posterior edge of the greater wing of the sphenoid bone and the petrous part of the temporal bone; called also angular or petrosphenoidal fissure.
		media´na ante´rior medul´lae oblonga´tae [TA] anterior median fissure of medulla oblongata: the longitudinal fissure in the median plane of the anterior aspect of the medulla oblongata, continuous with the anterior median fissure of the spinal cord; it separates the pyramids and is partially obliterated below by their decussation.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_f_08zPzhtm (4162 words)

	Bioline International Official Site (site up-dated regularly)
		Longus capitis extends from the inferior surface of the basilar occipital bone and clivus to its attachment on the transverse processes of the third to sixth cervical vertebrae.
		Muscular anatomy [Figure - 4]: The muscles involved with the C1-C2 complex on the anterior aspect are the recti capitis anterior and lateralis, both stretching from the anterior aspect of the transverse process of C1 respectively, to the inferior surface of the basilar occipital bone.
		The microsurgical anatomy of the vertebral artery was evaluated along its course from the C3 transverse process to its entrance into the spinal canal at the C0-C1 level with particular attention to its relationship with the bony structures.
	www.bioline.org.br /request?ni04055 (4162 words)

	Gray, Henry. 1918. Anatomy of the Human Body. Page 181
		Behind the basilar portion of the occipital bone is the foramen magnum, bounded laterally by the occipital condyles, the medial sides of which are rough for the attachment of the alar ligaments.
		The foramen magnum transmits the medulla oblongata and its membranes, the accessory nerves, the vertebral arteries, the anterior and posterior spinal arteries, and the ligaments connecting the occipital bone with the axis.
		Lateral to the stylomastoid foramen, between the tympanic part and the mastoid process, is the tympanomastoid fissure, for the auricular branch of the vagus.
	www.bartleby.com /107/pages/page181.html (569 words)

	Bones
		Located at the base of skull, Anterior to basilar part of Occipital Bone and back of the Ethmoid Bone.
		Frontal, Parietal (2), Temporal (2), Occipital, Sphenoid, Ethmoid, Maxilla (2), Zygomatic, Mandible, Lacrimal (2), Nasal (2), Palatine, Vomer, Palatine (2), Hyoid, and Inferior Nasal Conchae (2).
		Zygomaticofacial Foramen connects by means of a canal through the bone to the Zygomaticoorbital Foramen
	www.uic.edu /depts/mcam/specialties/radiology/mafee (424 words)

	II. Osteology. 5c. The Exterior of the Skull. Gray, Henry. 1918. Anatomy of the Human Body.
		Behind the basilar portion of the occipital bone is the foramen magnum, bounded laterally by the occipital condyles, the medial sides of which are rough for the attachment of the alar ligaments.
		The foramen magnum transmits the medulla oblongata and its membranes, the accessory nerves, the vertebral arteries, the anterior and posterior spinal arteries, and the ligaments connecting the occipital bone with the axis.
		The skull as a whole may be viewed from different points, and the views so obtained are termed the normæ of the skull; thus, it may be examined from above (norma verticalis), from below (norma basalis), from the side (norma lateralis), from behind (norma occipitalis), or from the front (norma frontalis).
	www.bartleby.com /107/46.html (424 words)

	IV. Myology. 5d. The Anterior Vertebral Muscles. Gray, Henry. 1918. Anatomy of the Human Body.
		It arises from the anterior surface of the lateral mass of the atlas, and from the root of its transverse process, and passing obliquely upward and medialward, is inserted into the inferior surface of the basilar part of the occipital bone immediately in front of the foramen magnum.
		The Rectus capitis lateralis, a short, flat muscle, arises from the upper surface of the transverse process of the atlas, and is inserted into the under surface of the jugular process of the occipital bone.
		The inferior oblique portion, the smallest part of the muscle, arises from the front of the bodies of the first two or three thoracic vertebræ; and, ascending obliquely in a lateral direction, is inserted into the anterior tubercles of the transverse processes of the fifth and sixth cervical vertebræ.
	www.bartleby.com /107/113.html (424 words)

	Temporal bone - Wikipedia, the free encyclopedia
		The apex, rough and uneven, is received into the angular interval between the posterior border of the great wing of the sphenoid and the basilar part of the occipital; it presents the anterior or internal orifice of the carotid canal, and forms the postero-lateral boundary of the foramen lacerum.
		The position and size of this foramen are very variable; it is not always present; sometimes it is situated in the occipital bone, or in the suture between the temporal and the occipital.
		The anterior surface forms the posterior part of the middle fossa of the base of the skull, and is continuous with the inner surface of the squamous portion, to which it is united by the petrosquamous suture, remains of which are distinct even at a late period of life.
	en.wikipedia.org /wiki/Temporal_bone (424 words)

	Gray's Anatomy - The Hind-brain or Rhombencephalon - Yahoo! Reference
		Its anterior surface is separated from the basilar part of the occipital bone and the upper part of the odontoid process by the membranes of the brain and the occipitoaxial ligaments.
		These two fissures divide the closed part of the medulla oblongata into symmetrical halves, each presenting elongated eminences which, on surface view, are continuous with the funiculi of the medulla spinalis.
		Similarly, the accessory, vagus, and glossopharyngeal nerves correspond with the posterior nerve roots, and are attached to the bottom of a sulcus named the postero-lateral sulcus.
	messenger.yahooligans.com /reference/gray/187.html (424 words)

	Figure 1: A Supplement to Descartes and the Pineal Gland
		Basilar part of the occipital bone (with the fossa for medulla oblongata).
		Tentorium cerebelli (with confluence of sinuses and opened great cerebral vein of Galen).
	plato.stanford.edu /entries/pineal-gland/figure1.html (63 words)

	II. Osteology. 5c. The Exterior of the Skull. Gray, Henry. 1918. Anatomy of the Human Body.
		Behind the nasal cavities is the basilar portion of the occipital bone, presenting near its center the pharyngeal tubercle for the attachment of the fibrous raphé of the pharynx, with depressions on either side for the insertions of the Rectus capitis anterior and Longus capitis.
		The zygomatic arch is formed by the zygomatic process of the temporal and the temporal process of the zygomatic, the two being united by an oblique suture; the tendon of the Temporalis passes medial to the arch to gain insertion into the coronoid process of the mandible.
		The lateral pterygoid plate is broad; its lateral surface forms the medial boundary of the infratemporal fossa, and affords attachment to the Pterygoideus externus.
	www.bartleby.com /107/46.html (4273 words)

	II. Osteology. 5a. The Cranial Bones. 1. The Occipital Bone. Gray, Henry. 1918. Anatomy of the Human Body.
		The curved, expanded plate behind the foramen magnum is named the squama; the thick, somewhat quadrilateral piece in front of the foramen is called the basilar part, whilst on either side of the foramen is the lateral portion.
		From the external occipital protuberance a ridge or crest, the median nuchal line, often faintly marked, descends to the foramen magnum, and affords attachment to the ligamentum nuchæ; running from the middle of this line across either half of the nuchal plane is the inferior nuchal line.
		The lower division of the cruciate eminence is prominent, and is named the internal occipital crest; it bifurcates near the foramen magnum and gives attachment to the falx cerebelli; in the attached margin of this falx is the occipital sinus, which is sometimes duplicated.
	www.bartleby.com /107/31.html (1850 words)

	II. Osteology. 5a. The Cranial Bones. 1. The Occipital Bone. Gray, Henry. 1918. Anatomy of the Human Body.
		The curved, expanded plate behind the foramen magnum is named the squama; the thick, somewhat quadrilateral piece in front of the foramen is called the basilar part, whilst on either side of the foramen is the lateral portion.
		That part of the squama which lies above the highest nuchal lines is named the planum occipitale, and is covered by the Occipitalis muscle; that below, termed the planum nuchale, is rough and irregular for the attachment of several muscles.
		From the external occipital protuberance a ridge or crest, the median nuchal line, often faintly marked, descends to the foramen magnum, and affords attachment to the ligamentum nuchæ; running from the middle of this line across either half of the nuchal plane is the inferior nuchal line.
	www.bartleby.com /107/31.html (1850 words)

	Is syringomyelia pathology or a natural protective phenomenon? Goel A J Postgrad Med
		Currently the well-accepted premise is that Chiari malformation and related pathological events could be primarily attributable to maldevelopment of the occipital bone and overcrowding of the normally developed cerebellum within a smaller posterior cranial fossa.
		Basilar invagination and the associated basal maldevelopment and the resultant reduction in the posterior cranial fossa volume are the primary events in pathology.
		We observed that although the dimensions of the foramen magnum were large, and in the majority of cases larger than normally found, the volume of its contents and probably the longstanding ‘pulsatile’ compression of the structures at the foramen magnum resulted in the neurological symptoms.
	www.jpgmonline.com /article.asp?issn=0022-3859;year=2001;volume=47;issue=2;spage=87;epage=8;aulast=Goel (1176 words)

	The Pharynx - WikiMD
		The fibers curve backward to be inserted into the median raphÃ©, being also prolonged by means of an aponeurosis to the pharyngeal spine on the basilar part of the occipital bone.
		On its lateral wall is the pharyngeal ostium of the auditory tube somewhat triangular in shape, and bounded behind by a firm prominence, the torus or cushion caused by the medial end of the cartilage of the tube which elevates the mucous membrane.
		The interval between the upper border of the muscle and the base of the skull is closed by the pharyngeal aponeurosis, and is known as the sinus of Morgagni The Stylopharyngeus (Fig.
	www.wikimd.org /index.php?title=The_Pharynx (1176 words)

	VII. The Veins. 3b. 5. The Sinuses of the Dura Mater. Gray, Henry. 1918. Anatomy of the Human Body.
		571) consists of several interlacing venous channels between the layers of the dura mater over the basilar part of the occipital bone, and serves to connect the two inferior petrosal sinuses.
		Dura mater and its processes exposed by removing part of the right half of the skull, and the brain.
		The sinuses of the dura mater are venous channels which drain the blood from the brain; they are devoid of valves, and are situated between the two layers of the dura mater and lined by endothelium continuous with that which lines the veins.
	www.bartleby.com /107/171.html (1806 words)

	Gray's Anatomy - The Hind-brain or Rhombencephalon - Yahoo! Reference
		Its anterior surface is separated from the basilar part of the occipital bone and the upper part of the odontoid process by the membranes of the brain and the occipitoaxial ligaments.
		The hind-brain or rhombencephalon occupies the posterior fossa of the cranial cavity and lies below a fold of dura mater, the tentorium cerebelli.
		Gray's Anatomy - The Hind-brain or Rhombencephalon - Yahoo!
	www.unipeak.com /gethtml.php?_u_r_l_=aHR0cDovL2VkdWNhdGlvbi55YWhvby5jb206ODAvcmVmZXJlbmNlL2dyYXkvMTg3Lmh0bWw= (10283 words)

	Bioline International Official Site (site up-dated regularly)
		Muscular anatomy [Figure - 4]: The muscles involved with the C1-C2 complex on the anterior aspect are the recti capitis anterior and lateralis, both stretching from the anterior aspect of the transverse process of C1 respectively, to the inferior surface of the basilar occipital bone.
		The microsurgical anatomy of the vertebral artery was evaluated along its course from the C3 transverse process to its entrance into the spinal canal at the C0-C1 level with particular attention to its relationship with the bony structures.
		The anatomy of the vertebral artery in the region of the craniovertebral junction is significantly different from the relatively straightforward course in the transverse foramina of C6 to C3 vertebrae.
	www.bioline.org.br /request?ni04055 (3893 words)

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Topic: Basilar part of occipital bone

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In the News (Thu 24 Dec 09)