GENERAL HISTOLOGY

BONE

STRUCTURES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The structural unit of compact bone, that runs parallel to the long bone axis, is the
A
osseous matrix
B
osteoclast
C
spongy bone
D
osteon
Explanation: 

Detailed explanation-1: -Compact bone tissue consists of units called osteons or Haversian systems. Osteons are cylindrical structures that contain a mineral matrix and living osteocytes connected by canaliculi, which transport blood. They are aligned parallel to the long axis of the bone.

Detailed explanation-2: -The Haversian canal contains small blood vessels responsible for the blood supply to osteocytes (individual bone cells). Osteons are several millimetres long and about 0.2 millimetre (0.008 inch) in diameter; they tend to run parallel to the long axis of a bone.

Detailed explanation-3: -osteon, the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal (named for Clopton Havers, a 17th-century English physician).

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