5

17. Which one of the following is a correct statement concerning Haversian systems

(osteons)?

a. are found in fetal skeletons
b. are found in spongy bone
c. develop around Volkman's canals
d. develop around a blood vessel
e. are most common during rapid growth of adolescence

 
18. Osteoclasts arise from
 

a. osteocytes
b. osteoblasts
c. osteoclasts
d. monocytes
e. osteoprogenitor cells

 
19. Osteocytes arise most directly from
 

a. chondrocytes
b. osteoblasts
c. osteoclasts
d. monocytes
e. osteoprogenitor cells

 
20. Fibrocartilage is characterized at the light microscopic level by
 

a. basophilia
b. elastic fibers
c. perichondrium
d. collagen(ic) fibers
e. mineralized matrix

21. The microscopic structure of certain parts of the temporomandibular joint differs from

corresponding parts of most other articulations of the human body. One such
difference is that the articulating surfaces of the TMJ are

a. bone
b. elastic cartilage
c. vascular
d. fibrous tissue
e. hyaline cartilage