How many articulating surfaces are on the canine sacrum?

How many articulating surfaces are on the canine sacrum?

• A. 4
• B. 5
• C. 7
• D. 6

Answer: (D)

Six articulating surfaces occur where the canine sacrum connects with neighboring bones. It has two superior articular surfaces on its base that meet the last lumbar vertebra, two auricular (lateral) surfaces that form the sacroiliac joints with the ilia, and two articular surfaces on the caudal part that articulate with the first coccygeal vertebra. Adding these gives six articulating surfaces in total.

Six articulating surfaces occur where the canine sacrum connects with neighboring bones. It has two superior articular surfaces on its base that meet the last lumbar vertebra, two auricular (lateral) surfaces that form the sacroiliac joints with the ilia, and two articular surfaces on the caudal part that articulate with the first coccygeal vertebra. Adding these gives six articulating surfaces in total.