MICROANATOMY

MUSCLE NERVE CARTILAGE BONE

BONE STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is a haversian canal?
A
channels lying at right angles to the central canal, connecting blood and nerve supply of the periosteum to that of the Haversian canal
B
one of a network of tubes running through compact bone that contains blood vessels and nerves
C
dense fibrous membrane covering the surface of bones
D
tiny canals that link osteocytes
Explanation: 

Detailed explanation-1: -Haversian canals are a series of tubes around narrow channels formed by lamellae. The Haversian canals surround blood vessels and nerve fibers throughout the bone and communicate with osteocytes . The canals and the surrounding lamellae are called a Haversian system (or an osteon).

Detailed explanation-2: -The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.

Detailed explanation-3: -Haversian canals are a network of tubes found in compact bones. Other types of connective tissue and nerve tissue lack the Haversian canal. This allows the bone to receive oxygen and nutrients without becoming vascularized. These canals also communicate with bone cells via canaliculi, which are specific connections.

Detailed explanation-4: -The Haversian canal (osteonic canal) contains the bone’s blood vessels and nerve fibers (Figure 1). Osteons in compact bone tissue are aligned in the same direction along lines of stress and help the bone resist bending or fracturing.

Detailed explanation-5: -History. Haversian canals were first described (and probably discovered) by British physician Clopton Havers, after whom they are named. He described them in his 1691 work Osteologica Nova.

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