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Topic: Ethmoid bone

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	II. Osteology. 5a. 6. Ethmoid bone. Gray, Henry. 1918. Anatomy of the Human Body.
		The ethmoid bone is exceedingly light and spongy, and cubical in shape; it is situated at the anterior part of the base of the cranium, between the two orbits, at the roof of the nose, and contributes to each of these cavities.
		The anterior border articulates with the spine of the frontal bone and the crest of the nasal bones.
		In the disarticulated bone many of these cells are opened into, but when the bones are articulated, they are closed in at every part, except where they open into the nasal cavity.
	www.bartleby.com /107/36.html (1277 words)

	NationMaster - Encyclopedia: Ethmoid
		The vomer bone is one of the unpaired facial bones of the skull.
		The ethmoid bone is a bone in the skull that separates the nasal cavity from the brain.
		The ethmoid bone is very delicate and is easily injured by a sharp upward blow to the nose, such as a person might suffer by striking an automobile dashboard in a collision.
	www.nationmaster.com /encyclopedia/Ethmoid (2142 words)

	Ethmoid bone - Biocrawler (Site not responding. Last check: )
		The ethmoid bone (os ethmoidale) is a bone in the skull that separates the nasal cavity from the brain.
		The ethmoid bone (os ethmoidale) is exceedingly light and spongy, and cubical in shape; it is situated at the anterior part of the base of the cranium, between the two orbits, at the roof of the nose, and contributes to each of these cavities.
		The ethmoid articulates with fifteen bones: four of the cranium—the frontal, the sphenoid, and the two sphenoidal conchæ; and eleven of the face—the two nasals, two maxillæ, two lacrimals, two palatines, two inferior nasal conchæ, and the vomer.
	www.biocrawler.com /encyclopedia/Ethmoid_bone (1247 words)

	Palaeos Vertebrates > Bones> Braincase > Ethnoid Region > The Ethmoid
		In general, it may be best to consider the ethmoid as containing three "bones": (a) the paired lateral ethmoids (presumably derived largely from the nasal capsules) and (b) the mesethmoid (presumably derived largely from the fused anterior ends of the trabeculae).
		The cribiform plate of the ethmoid is apparently a linguistic redundancy, since both terms refer to the sieve-like nature of the braincase at the roof of the nasal cavity.
		This manifestation of the ethmoid has received considerable attention since John Ruben and co-workers argued that turbinals (to pick one of the three names by which these structures are known), or their functional equivalents, are more or less indispensable for endothermic animals.
	www.palaeos.com /Vertebrates/Bones/Braincase/Ethmoid.html (2120 words)

	Cranial Fossae
		Posterior border of the lesser wing of the sphenoid and the anterior margin of the chiasmatic groove.
		The superior orbital fissure is bounded superiorly by the lesser wing, inferiorly by the greater wing, medially by the body of the sphenoid, and laterally by the orbital portion of the frontal bone.
		• The bony floor is formed by the dorsum sellae and the clivus of the sphenoid, the occipital bone, the petrous and mastoid temporal bone, and the parietal bone.
	www.ucsf.edu /nreview/02.4-Anatomy-Cranium/CranialFossae.html (529 words)

	Skeletal System
		The best-known sesamoids are the patella (kneecap) and pisiform (wrist bone).
		Although this bone is located in the neck, it is suspended by ligaments from the styloid (spear-shaped) processes that extend downward from the temporal bones.
		The palatine bones form part of the lateral walls and floor of the nasal cavity, part of the roof of the mouth, the floor of the orbits, and the rear (posterior) portion of the hard palate.
	www.angelfire.com /ut/biocheat/SkeletalSystem.html (3124 words)

	ethmoid bone - Search Results - MSN Encarta
		Internally, the cranial bones include the ethmoid bone, which forms part of the septum of the nose and through which the olfactory nerves pass from...
		The perpendicular plate of the ethmoid bone (vertical plate) is a thin, flattened lamina, polygonal in form, which descends from the under surface of the cribriform plate, and assists in forming...
		Between the orbits along the anterior portion of the cranium floor, the ethmoid bone composes the...
	ca.encarta.msn.com /ethmoid_bone.html (231 words)

	Neck
		The sections of the ethmoid bone are positioned between the orbits, forming the walls and roof of the nasal cavity, while the three middle ear ossicles (stapes, malleus, and incus) are located within the temporal bones on each side of the skull.
		The bones of the skull, with the exception of the mandible, are held together by very thin sutures, or seams, in which the periosteum of the individual bones interweave with each other, and are cemented by a fibrous, connective tissue.
		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)

	Head & Face Medicine \| Full text \| Osteoid osteoma of the ethmoid bone associated with dacryocystitis
		Grayeli et al reported a case of posterior ethmoid osteoid osteoma [4], Banerjee et al reported a case of Osteoid osteoma of the ethmoid associated with pneumocephalus [5], while Pai et al reported a large osteoid osteoma of the ethmoid with intraorbital and intracranial extension [6].
		The nidus is surrounded by thickened cortical bone [1,2].
		In these cases, diagnosis is based on the size of the nidus, and the presence of reactive bone formation, while active osteoblasts are more numerous, the stroma is richly vascularized and extravasated blood with large number of multinucleated giant cell macrophages are noted [1,2,6].
	www.head-face-med.com /content/2/1/23 (1721 words)

	Reference.com/Encyclopedia/Ethmoid bone
		The ethmoid bone (from Greek ethmos, "sieve") is a bone in the skull that separates the nasal cavity from the brain.
		Blows to the head can also shear off the olfactory nerves that pass though the ethmoid bone and cause anosmia, an irreversible loss of the sense of smell and a great reduction in the sense of taste (most of which depends on smell).
		Fracture of the lamina papyracea, the lateral plate of the ethmoid labyrinth bone, permits communication between the nasal cavity and the ipsilateral orbit through the inferomedial orbital wall, resulting in orbital emphysema.
	www.reference.com /browse/wiki/Ethmoid (390 words)

	Univ of Michigan - Gross Anatomy - Bones of the Head & Neck
		it articulates with the mandibular fossa of the temporal bone
		it articulates with the parietal bone and the greater wing of the sphenoid bone at the squamous suture
		the zygomatic bone is frequently fractured in blows to the side of the orbit; the temporal fascia attaches to the zygomatic arch
	anatomy.med.umich.edu /anatomytables/bones_head_neck.html (3886 words)

	eMedicine - Facial Bone Anatomy : Article by Babak Jahan-Parwar, MD
		It articulates with the palatine bone posteriorly and with the ethmoid, lacrimal, and inferior concha bones medially.
		Anteriorly, the external surface is convex superiorly, and it articulates with the parietal bones posteriorly and the greater wing of the sphenoid posteroinferiorly.
		The orbital surface articulates posteriorly with the greater and lesser wings of the sphenoid bone; medially with the ethmoid, lacrimal, and maxillary bones; and laterally with the zygoma.
	www.emedicine.com /ent/topic9.htm (2490 words)

	Ethmoid Hematomas
		The condition of an ethmoid hematoma is a hematoma that forms in the complex bony structure that exists in the nasal passages between the eyes.
		Ethmoid hematomas appear as soft tissue masses in association with the ethmoid bones and sometimes in the sinuses.
		A bone flap is made into the sinus over the mass and the hematoma is removed by curettage, cryotherapy, electrocautery, or laser.
	evrp.lsu.edu /healthtips/Ethmoid.htm (945 words)

	ethmoid bone - definition of ethmoid bone by the Online Dictionary from Datasegment.com (Site not responding. Last check: )
		(b) Pertaining to, or in the region of, the ethmoid bone.
		[1913 Webster] Ethmoid bone (Anat.), a bone of complicated structure through which the olfactory nerves pass out of the cranium and over which they are largely distributed.
		[1913 Webster] ethmoid bone - WordNet (r) 2.0 (August 2003) : ethmoid bone n : one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity [syn: ethmoid]
	onlinedictionary.datasegment.com /word/ethmoid+bone (120 words)

	Anatomy of the Face and Head Underlying Facial Expression
		The bony parts of the head, or the skull, form the framework on which the face is built.
		The Atlas of the Skull page below shows the skull as a whole and discusses the two classes of bones in the head: cranial and facial.
		The anatomy of muscles is most directly related to facial expression, as the muscles underlie these appearance changes.
	face-and-emotion.com /dataface/anatomy/anatomy.jsp (634 words)

	[No title]
		The "ethmoid bone" is located in front of the sphenoid bone.
		It consists of two masses, one on each side of the nasal cavity, which are joined horizontally by thin "cribriform plates." These plates form part of the roof of the nasal cavity, and nerves (ethmoidal cells) associated with the sense of smell pass through tiny openings in them.
		Portions of the ethmoid bone also form sections of the cranial floor, eye sockets, and nasal cavity walls.
	www.innerbody.com /text/skel45.html (135 words)

	The Human Skull
		The sections of the ethmoid bone are positioned between the orbits, forming the walls and roof of the nasal cavity, while the three middle ear ossicles (stapes, malleus, and incus) are located within the temporal bones on each side of the skull.
		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).
		On the anteror surface of the bone, near the maxillo-zygomatic suture, ther is an infra-orbital foramen.
	www.becomehealthynow.com /mira2_front/printpage.php?id=830 (4333 words)

	Endoscopic Sinus Surgery Simulation Site (Site not responding. Last check: )
		The most anterior extramural cell of the ethmoid sinus; an elevation on lateral wall of the nasal cavity lying between the entrance of the middle meatus and olfactory sulcus.
		Bone plate on the roof of the nasal cavity, through which the olfactory nerves go from the olfactory epithelium in the roof of the nose to the brain.
		Areas of bone dehiscence in the middle meatus of the medial wall of the maxilary sinus.
	utopia.hitl.washington.edu /glossary/jsp/glossary.jsp (4362 words)

	[No title]
		The septum is formed by the perpendicular plate of the ethmoid bone above, the vomer bone posteriorly and by an extensive cartilage anteriorly (Fig.
		The roof is formed by the cribriforrn plate of the ethmoid bone, through which olfactory nerves enter the nasal cavity.
		The lateral walls are formed from several different bones, but their most striking features' their three conchae or turbinates, are formed primarily from the ethmoid bone and a separate bone known as the inferior nasal concha.
	www.emory.edu /ANATOMY/AnatomyManual/nose.html (2123 words)

	Skull (Site not responding. Last check: )
		It is posterior to the frontal bone, inferior and medial to the temporal bones and anterior to the occipital bone.
		: is the suture between the parietal bones and the occipital bone.
		The superior part of the bony part of the septum consists of a thin downward extension of the ethmoid bone which lies on the midline.
	bio.winona.edu /dapkus/211/Skeletal/skull.htm (2161 words)

	ethmoid on Infinite Tree (Site not responding. Last check: )
		ethmoid sinus sphenoid sinus maxillary sinus frontal sinus ethmoid sinus sphenoid sinus maxillary sinus frontal ethmoid sphenoid maxillary frontal ethmoid sphenoid maxillary coronal suture.
		The ethmoid bone is a bone in the skull that separates the nasal cavity from the brain.
		Maxillary bone • Sphenoid bone • Ethmoid bone • Palatine bone • Lacrimal bone...
	infinitetree.com /page/ethmoid (1164 words)

	HeadShape.Info
		Cranium: The nine (9) bones that make up the cranium are: the frontal bone (1), the paired parietal bones (2), the paired temporal bones (2), the paired ethmoid bone (1), the paired sphenoid bone (2) and the occipital bone (1).
		The frontal bone is fused with the parietal bones (coronal suture), the sphenoid bones, maxilla and nasal bones.
		Lambdoid suture(s): separates the parietal bones and the occipital bone; it arches across the back of the skull ending bilateral where the parietal and occipital bones meets the temporal bone.
	www.plagiocephaly.org /headshape (427 words)

	Head and Neck Quiz -- Bones of the Face Part 2
		What is the area of between the greater and lesser wings of the sphenoid bone that transmits structures from the cranial cavity to the orbit, "the space between the wings"?
		What are the lateral portions of the ethmoid bone in the nasal cavity on either side of the perpendicular plate that warms the nose?
		What are the thin walled structures within the ethmoid bone which are on either sides of the perpendicular plate that is an open cavity with sinuses in them?
	www.amyrdhstudents.com /hnbones2.htm (986 words)

	Skull 4a
		Lateral to the sella turcica are the butterfly-shaped greater wings of the sphenoid bone.
		Immediately anterior to the sphenoid bone is the ethmoid bone, which forms the roof of the nasal cavity and a portion of the partition (nasal septum) dividing the nasal cavity into the right and left sides.
		The superior surface of the ethmoid bone forming the roof of the nasal cavity is called the cribriform plate.
	bioweb.uwlax.edu /aplab/Table_of_Contents/Lab_03/Skull_4/Skull_4a/skull_4a.html (237 words)

	Ethmoid Sinus
		The ethmoid sinuses are located within the human skull between the eye sockets and above the nose.
		Ethmoid sinuses are matchbox-sized areas filled with 7 to 10 interconnected bubbles made of very thin-walled bone.
		This reduces the flow of mucous, which result in the accumulation of mucous in the ethmoid sinuses.
	www.sinus-pro.com /ethmoid_sinus.asp (143 words)

	skull
		The ethmoid bone is full of sinus cavities (do you ever get those sinus headaches where your eye sockets ache?) Infections in these sinus cavities are dangerous due to the intimate association of this bone with the brain and its meninges.
		- a pair of L shaped bones that form the posterior mouth walls and the posterior 1/3 of the roof of the mouth.
		This u-shaped bone articulates with the temporal bone.
	www.etsu.edu /cpah/hsci/bowersjh/skull.html (820 words)

	Anatomy of skull (Site not responding. Last check: )
		If the sphenoid is the most difficult cranial bone to describe and invision, the Ethmoid is the second most difficult.
		Like the sphenoid, it is a single bone that runs through the mid-sagittal plane and aids to connect the cranial skeleton to the facial skeleton.
		Directly inferior to the Crista Galli and running in the mid-sagittal plane is the Perpendicular Plate of the ethmoid which articulates with the vomer more inferiorly and assists in separating the left and right nasal passages.
	a-skull.net.ru /eb.html (296 words)

	ethmoid - OneLook Dictionary Search
		Ethmoid : Online Plain Text English Dictionary [home, info]
		noun: one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity
		Phrases that include ethmoid: ethmoid bone, ethmoid sinus, uncinate process of ethmoid bone, ethmoid infundibulum, anterior ethmoid arteries, more...
	www.onelook.com /?w=ethmoid&ls=a (208 words)

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