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Topic: Medullary cavity

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	[No title] (Site not responding. Last check: 2007-11-05)
		[18-11]:Within the medullary cavity, malignant neoplastic osteoid is haphazardly arranged among the approximately parallel trabeculae of pre-existing bone.
		This is a tumor composed of "malignant" hyaline and chondromyxoid cartilage in the medullary cavity and extending outward beyond the periosteum.
		[18-17]:Ewing's sarcoma is one of the few malignant tumors of bone that characteristically arises in the medullary cavity of the diaphysis, as illustrated in this longitudinally sectioned femur of a child.
	www.georgetown.edu /dml/educ/path/lab18/lab18.txt (485 words)

	Medullary cavity barrier - Patent 4745914
		A medullary cavity barrier for insertion in a tubular bone, said barrier comprising a one piece metal body having a rosette shape with at least three radially extending leaves, each said leaf being elastically and permanently deformable, said body being permeable to blood and fat and impermeable to bone cement.
		A medullary cavity barrier as set forth in claim 7 wherein said body includes a central core and each leaf extends from said core in a common plane to a first bend and extends at an angle from said first bend to a second bend to extend radially inwardly.
		As is known, medullary cavity barriers or plugs have been used to prevent bone cement from penetrating into the medullary cavity of a tubular bone which is contiguous to a surgically prepared cutout for the insertion of a prosthesis shank.
	www.freepatentsonline.com /4745914.html (1832 words)

	Medullary cavity - Wikipedia, the free encyclopedia
		The medullary cavity is the central cavity of bone shafts where yellow marrow (adipose) is stored.
		In an infant this area is involved in the formation of red blood cells, so red marrow is present.
		Located in the main portion of the bone (diaphysis), the medullary cavity has walls composed of compact bone; is lined with a thin, vascular membrane (the endosteum); and is filled with "fatty" yellow bone marrow.
	en.wikipedia.org /wiki/Medullary_cavity (96 words)

	[No title]
		The peribranchial cavity (A) is full of water, and its walls are lined with the skin-sense layer; it opens outwards in the rear through the respiratory pore (Figure 2.210 c).
		A groove or furrow (the medullary groove) is sunk in the middle line of the flat surface, and two parallel longitudinal swellings arise on either side from the skin layer.
		The ejection-opening of this peribranchial cavity corresponds to the branchial pore of the Amphioxus.
	www.knowledgerush.com /pg/etext04/vlmn210.txt (20050 words)

	Intramedullary compression nail for the treatment of bone fractures - Patent 4091806
		This enlarging of the medullary cavity weakends the shaft of the bone and reduces the blood supply to the fractured ends, thereby impeding the provision of healing factors.
		The nail -- hereinafter termed "compression nail" -- according to the invention, serves to prestress the fractured bone in a manner similar to the principle of prestressing known in the construction of concrete beams, whereby all tensile stresses are borne by the steel reinforcement.
		The threaded bar is of small diameter which permits the bending of the compression nail to the curvature of the medullary cavity before insertion, without impeding the relative movement of the wedge obtained by rotation of the said bar.
	www.freepatentsonline.com /4091806.html (1813 words)

	FM definitions for NLM9.20.00
		is a subdivision of a lymphatic tree, the lumen (organ cavity) of which is continuous with the lumen of veins, directly or indirectly; it conveys lymph from organs and body parts to lymph nodes and veins; together with other lymphatic vessels and lymph nodes, it constitutes the lymphatic system.
		is an organ cavity subdivision that is a part of a serous cavity, demarcated from other serous cavity subdivisions by one or more anatomical structures or anatomical surfaces; together with other serous cavity subdivisions, it constitutes the serous cavity.
		is an organ with organ cavity, which consists of continuous serous membranes that surround a serous cavity, some organ parts of that constitute a serous membrane, which surrounds a serous cavity.
	sig.biostr.washington.edu /education/resources/defs092000.html (2954 words)

	Canine Panosteitis (Site not responding. Last check: 2007-11-05)
		The increased medullary opacity usually is not prominent in the area of the nutrient canal of the bone.
		The radius on the left is in the initial stages of panosteitis while the medullary cavity of the adjacent ulna is totally affected and the secondary periosteal reaction is evident on the caudal border.
		During the osteogenesis of the medullary density, the fibrous bony trabeculae are replaced by lamellar bone trabeculae, the vascularity of the bone marrow is reestablished, and the bone marrow becomes hemopoietic.
	www.ivis.org /special_books/ortho/chapter_49/49mast.asp (2442 words)

	Description of Anatomy of Bones (Site not responding. Last check: 2007-11-05)
		The cavity is called the medulla or medullary cavity, and the walls of the cavity are called the cortex.
		Surrounding the outside of the diaphysis of a long bone is a layer of connective tissue called the periosteum.
		A similar tissue layer, the endosteum, lines the walls of the medullary cavity.
	www.vet.purdue.edu /bms/vldl/TA_02_bone_descr.html (208 words)

	Medullary cavity pin - Patent 4261351
		If the traditional medullary cavity pins are used and their cross section exceeds the narrowest inside diameter of the medullary cavity, then it will exert an unfavourable stretching force and may even cause the longitudinal splitting of the femur.
		At a further suitable embodiment of the medullary cavity pin according to the invention the reinforcing lamellae are fitted to the reinforcing ribs of the pin shank and their number preferably agrees with the number of the reinforcing ribs.
		Furthermore the medullary cavity pin according to the invention is favourable because the forces reacting along the surface of the fracture are distributed on a large surface, thus bending of the metal, its breakage due to fatigue, or its break out of the bone can not occur.
	www.freepatentsonline.com /4261351.html (2415 words)

	Dorlands Medical Dictionary
		vis, [TA] abdominopelvic cavity: the space within the trunk between the diaphragm and the inferior boundary of the lesser pelvis; it is divided into the abdominal and pelvic cavities.
		fibrotic cavities, cavities of the lung composed of granulation tissue surrounded by scar tissue, as in idiopathic pulmonary fibrosis or tuberculosis; in tuberculosis they may be the source from which the disease spreads to other pulmonary segments.
		tension cavities, cavities of the lung in which the air pressure is greater than that of the atmosphere, as in tension pneumothorax.
	www.merckmedicus.com /pp/us/hcp/thcp_dorlands_content.jsp?pg=/ppdocs/us/common/dorlands/dorland/dmd-c-019.htm (1724 words)

	Malignant Bone Tumors in the Dog
		Although osteosarcoma of the appendicular skeleton arises in the medullary cavity of the metaphyseal region, in many instances the cortex and surrounding soft tissue are invaded prior to clinical presentation or surgical intervention.
		Central chondrosarcomas of long bones arise in the medullary cavity and may penetrate the cortex and invade the parosteal tissue.(37) Parosteal-reactive new bone may be laid down around the tumor.
		Liposarcoma is a malignant tumor that arises from the adipose tissue of the bone marrow cavity.
	www.ivis.org /special_books/ortho/chapter_74/74mast.asp (5478 words)

	Medullary cavity template - Patent 5681318
		A medullary cavity template according to claim 2, wherein the handle extends in a radial direction with respect to the tubular body.
		A medullary cavity template according to claim 1, wherein the tubular body is open at both ends.
		At its distal end 32, body 31 is convergently tapered with a rounded, generally ogival contour to the point of intersection with the bore diameter, at which point the angle of intersection between the convergent taper and the bore 31' is in the range of 25 to 35 degrees, as viewed in a longitudinal section.
	www.freepatentsonline.com /5681318.html (1866 words)

	VII. Bone Tumors (Site not responding. Last check: 2007-11-05)
		H&E. The cortex and the medullary cavity of the stalk of an osteochondroma are composed of normal bone which merges with the bone of origin.
		Chondrosarcoma may originate in the medullary cavity (central chondrosarcoma), arising de novo in about 75% of cases or by malignant transformation of a preexisting enchondroma particularly in patients with enchondromatosis, or originate in a juxtacortical location (peripheral chondrosarcoma) by sarcomatous change in the cartilage cap of an osteochondroma.
		rossly, the sarcoma tissue is gray, soft, often hemorrhagic and necrotic, infiltrates the medullary cavity, penetrates through the cortex and the bulging periosteal reactive new bone, and extends as a bulky mass into the surrounding soft tissues.
	edcenter.med.cornell.edu /CUMC_PathNotes/Skeletal/Bone_07.html (3593 words)

	Bone
		The infection may then spread rapidly by way of vascular channels through the medullary cavity and the bone cortex which is thin in the region of the metaphysis and provides easy access to the periosteum.
		The vertebral bodies, particularly in the thoracolumbar region of the spine, may be weakened by microfractures and collapse anteriorly, resulting in compression fractures and wedging of the vertebrae, a loss of stature, and kyphotic deformity of the spine ("dowager's hump").
		The bone lesions are caused by a diffuse infiltration of Gaucher cells in the bone marrow and eroding the inner cortex.
	edcenter.med.cornell.edu /CUMC_PathNotes/Skeletal/Bone.html (15893 words)

	RedNova News - Science - The Evolution of Long Bone Microstructure and Lifestyle in Lissamphibians (Site not responding. Last check: 2007-11-05)
		At the microanatomical level, the presence of spongy tissue in the center of the medullary region of long limb bones, as in cetaceans, or of massive pachyostosis, as in mesosaurs (Ricqls 1974a), placodonts (Buffrnil and Mazin 1992), and sirenians (Fawcett 1942; Buffrnil and Schoevaert 1989), is thought to indicate an aquatic lifestyle (Ricqls 1977).
		S is the reciprocal of the slope of the compactness change at point P. It usually reflects the width of the transition zone between the cortical compacta and the medullary cavity (or the medullary spongiosa), because a low slope indicates a broad region where the compactness is higher than 0 but lower than 1.
		This method has the drawback of generating high S values when the outline of the medullary cavity is irregular or does not match closely the outline of the bone, as well as when a transition zone of spongy bone is present between both zones.
	www.rednova.com /news/display/?id=101557 (9288 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		As the primary ossification centre expands, osteoclasts break down the newly formed spongy bone and open up a cavity (medullary cavity) in the centre of the shaft.
		This cavity is the final step in ossification of the shaft.
		Around the time of birth most of our long bones have a bony diaphysis surrounding remnants of spongy bone, a widening medullary cavity and two cartilaginous epiphyses.
	www.peworld.org /anatomy/bones3.htm (269 words)

	8.2.4
		The plexuses are rich in blood vessels and separated from the cavity of the ventricles by only a single layer of secretory cells, thus affording ready access to the fluid by medical nanorobots (Chapter 16).
		Joint cavities sometimes extend into pouches or recesses or communicating bursae, and the shape of the sac changes with motion, as in the knee joint.
		Synovial fluid, which lubricates and nourishes the joint, is exuded by the synovial membrane and fills the capsule cavity.
	www.nanomedicine.com /NMI/8.2.4.htm (1557 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		Two types of bone matrix are observed in the mature skeleton: hard compact cortical bone, found largely in the shafts of the long bones that surround the marrow cavities; and spongy or cancellous bone, which comprises a network of fine, interlacing partitions, the trabeculae, enclosing cavities that contain either hematopoietic or fatty marrow.
		(8) Therefore, the contribution of the metaphyseal arteries to the medullary arterial system is minimal unless there is an abnormal demand for a supplemental supply to the medulla, such as occurs when the branches of the nutrient artery have been obliterated by fracture or by surgery.
		Observe that branches of the medullary arteries supply the full thickness of the cortex everywhere except at firm fascial attachments which are typically at corners.
	cal.vet.upenn.edu /saortho/chapter_01/01mast.htm (6219 words)

	Expandable intramedullary nail for the fixation of bone fractures - Patent 4453539
		Typically, the diameter of the nail was selected to correspond with the narrowest part of the medullary cavity of the bone into which the nail was to be inserted.
		However, the principal drawback of this type of nail is that the practice of enlarging the medullary cavity tends to weaken the shaft of the bone and reduce the blood supply to the fractured ends, thereby impeding the healing process.
		Such a nail has a retracted diameter in the end portion which permits the nail to be inserted through the convergent portion of the medullary cavity, and thereafter expanded to engage the increased diameter inner wall of the divergent portion.
	www.freepatentsonline.com /4453539.html (3316 words)

	Femoral pin for hip prosthesis - Patent 4287617
		The present invention relates to improvements in prostheses for the hip of the type comprising a femoral pin which is driven into the medullary cavity of the femur and the end of which bears a ball joint adapted to be engaged in the natural or artificial acetabulum of the hip bone.
		A C-shaped section is thus obtained which exhibits excellent transverse elasticity, this facilitating the positioning of the pin in the medullary cavity by insertion.
		Of course, such a prosthesis may be fixed to the medullary cavity by means of a conventional plastic seal which reinforces the anchoring effect ensured by the above-mentioned bone growth.
	www.freepatentsonline.com /4287617.html (834 words)

	YSANDER et al. Intramedullary osseointegration (Site not responding. Last check: 2007-11-05)
		Entering the medullary cavity was felt as a "loss of resistance." The position of the drill within the medullary cavity was checked by gently bending in circumferential directions to locate the walls of the medullary cavity.
		A M2 pre-tapping device was inserted and the preformed medullary canal was tapped to the appropriate depth.
		The mid-section of the implant was grasped with titanium forceps and a 1.2-mm diameter Allen key was adapted to the corresponding hole.
	www.vard.org /jour/01/38/2/myers382.htm (3807 words)

	Cartilage, Bone& Joints
		Spongy or trabecular bone is the bone that is found in the marrow (medullary) cavity, especially in long bones.
		If the marrow cavity is not active in, fat cells replace the progenitor cells and the marrow is said to be yellow bone marrow.
		The former lines the lateral margins of the joint cavity, and the cuboidal to low cuboidal cells that line the internal side of the joint cavity are called the lining cells.
	anatomy.iupui.edu /courses/histo_D502/D502f02/Cartilage%20Bone/Lab.8.Cart.bone.f02.html (3681 words)

	[No title]
		The internal surface of cortical bone, adjacent to the medullary cavity.
		Central cavity within a long bone, usually filled with marrow (but air-filled in some bird bones).
		Vascular channels running perpendicular to the periostoeal and endosteal surfaces, connecting the vessels in the Haversian canals and (in some cases) connecting with vessels in the periosteum and the medullary cavity.
	www.shef.ac.uk /sheffield/jsp/polopoly.jsp?a=23845&d=451&origdept=2580 (389 words)

	Medullary cavity (Site not responding. Last check: 2007-11-05)
		Located in the main portion of the bone (diaphysis)the medullary cavity has walls composed of compact bone, lined with a thin, vascular membrane (the endosteum) and is filled with "fatty" yellow bone marrow.
		This page was last modified 13:26, 9 May 2005.
		The article about Medullary cavity contains information related to Medullary cavity.
	www.arikah.net /encyclopedia/Medullary_cavity (112 words)

	[No title]
		This cavity is continuous with the spaces of the spongy bone and is filled with a specialized type of connective tissue called marrow.
		The marrow in the medullary cavity of an adult bone is usually of a type called yellow marrow, which functions as fat storage tissue.
		Osteoblasts are found on the outer surfaces of the bones and in the bone cavities.
	www.nsbri.org /HumanPhysSpace/focus6/ep_development.html (2043 words)

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