Question

what structure(s) occupie(s) the space labeled \haversian canal\?
your textbook calls it the central canal.

a osteoblasts and osteocytes.
b cellular extensions of osteocytes (pseudopodia).
c blood vessels, nerve fibers, and a lymphatic vessel.
d this is the track left by an osteoclast.

Explanation:

Identify the target structure

The question asks what structures occupy the space labeled "Haversian canal" (also known as the central canal) in compact bone tissue.

Analyze the function of the central canal

The Haversian canal is a central channel running longitudinally through the center of an osteon. It serves as a pathway for supplying nutrients and removing waste from the bone tissue.

Evaluate the options

• Option A: Osteoblasts and osteocytes. Osteocytes reside in lacunae, not the central canal.
• Option B: Cellular extensions of osteocytes. These extensions run through tiny channels called canaliculi.
• Option C: Blood vessels, nerve fibers, and a lymphatic vessel. These are the primary structures that run through the Haversian canal to nourish and innervate the bone.
• Option D: Track left by an osteoclast. This is incorrect as the canal is a permanent structural feature of healthy compact bone.

Select the correct option

Option C correctly identifies the contents of the Haversian (central) canal.

Answer:

• (A) Osteoblasts and osteocytes.
• (B) Cellular extensions of osteocytes (pseudopodia).
• (C) Blood vessels, nerve fibers, and a lymphatic vessel. (Correct answer)
• (D) This is the track left by an osteoclast.