(1) Which of the following structures routes blood from the periosteum to the ce
ID: 61861 • Letter: #
Question
(1) Which of the following structures routes blood from the periosteum to the central canal canal of each osteon?
a. canaliculi
b. endosteum
c. osteocytes
d. perforating canals
(2) How do osteocytes obtain oxygen though the hardened minerals of osteon?
a. They don't; oxygen diffuses through the canaliculi.
b. They don't because mature osteocytes don't need oxygen.
c. Perforating canals that connect to each osteocyte bring nutrients and gases to the osteocytes.
d. The minerals are spaced such that gases can diffuse through the bone.
Explanation / Answer
1) d) Perforating canals or Volkmann's canals are the small channels in the bone that transmit blood vessels from the periosteum into the bone and that communicate with the central canal( Haversian canal) of each osteon. They provide nourishment and energy.
2) a) They don't; oxygen diffuses through the canaliculi. The osteocytes are arranged around the Haversian canal. Canaliculi are like small microscopic canals between the lacunae of ossified bone. The osteocyctes closest to the canal gets oxygen via diffusion from the blood vessel and this further spreads to the other osteocyctes through the canaliculi via diffusion from higher to lower concentration.
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