Question

what do arrows c and d point to? compact bone with arrow a pointing to little plates that extend around the shaft of bone, arrow b pointing to incomplete little plates, arrow c pointing to a canal which connect blood and nerve supply and arrow d pointing to a canal which contains blood vessels. transverse canal, vertical lamella volkmanns canal, haversian canal vein, artery nutrient artery, central canal

Explanation:

Volkmann's canals connect blood and nerve supplies and are horizontal, while Haversian canals contain blood vessels and are vertical in compact bone structure. Based on the description of what arrows C and D point to (a canal connecting blood - nerve supply and a canal containing blood vessels respectively), arrow C points to Volkmann's canal and arrow D points to Haversian canal.

Answer:

B. Volkmann's canal, Haversian canal