What are cartilaginous bones? Explain.
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Answer:
different types of developmental origin—the cartilaginous, or substitution, bones, which replace cartilages preformed in the general shape of the bone; and membrane bones, which are laid down within layers of connective tissue. For the most part, the substitution bones form the floor of the cranium, while membrane bones form thecompact bone, also called cortical bone, dense bone in which the bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes, or bone cells. Compact bone makes up 80 percent of the human skeleton; the remainder is cancellous bone, which has a spongelike appearance with numerous large spaces and is found in the marrow space (medullary cavity) of a bone. Both types are found in most bones. Compact bone forms a shell around cancellous bone and is the primary component of the long bones of the arm and leg and other bones, where its greater strength and rigidity are needed.
The osteon units of bone are made up of Haversian canals (HC) and Volkmann canals (VC), which run perpendicular to the long axes of osteons and connect adjacent Haversian canals.
compact bone
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Related Topics: bone osteon Volkmann canal
Mature compact bone is lamellar, or layered, in structure. It is permeated by an elaborate system of interconnecting vascular canals, the haversian systems, which contain the blood supply for the osteocytes; the bone is arranged in concentric layers around those canals, forming structural units called osteons. Immature compact bone does not contain osteons and has a woven structure. It forms around a framework of collagen fibres and is eventually replaced by mature bone in a remodeling process of bone resorption and new bone formation that creates the osteons.
Bones of the wrist and hand: dorsal view. skeletal system, human anatomy, appendage, hand bones, wrist bones, metacarpal bones, finger bones, phalanges.
BRITANNICA QUIZ
Human Bones Quiz
Without bones, the human body would have a great fall like Humpty Dumpty. Test your knowledge of the human skeleton and see how many ways you can put Humpty back together again.
The Editors of Encyclopaedia Britannica
This article was most recently revised and updated by Adam Augustyn.
Explanation:
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Explanation:
they are different from each other and it also hard.