Sacrum Anatomy Quiz
1. Which structure is depicted in figure 1?
A. Superior articular processes
B. Sacral cornua
C. Sacral promontory
D. Alae
The answer is A, superior articular processes. These articulate (form a joint) with the fifth lumbar vertebra (L5),
creating two zygapophyseal joints, which are synovial plane joints.
2. Which structure is depicted in figure 2?
A. Sacral hiatus
B. Sacral foramina
C. Sacral cornua
D. Sacral canal
The answer is D, sacral canal, which is a hollow opening that serves as a continuation of the vertebral canal
above, and it houses the sacral nerves.
3. Which structure is depicted in figure 3?
A. Sacral crest
B. Sacral apex
C. Dorsal sacral foramina
1. Which structure is depicted in figure 1?
A. Superior articular processes
B. Sacral cornua
C. Sacral promontory
D. Alae
The answer is A, superior articular processes. These articulate (form a joint) with the fifth lumbar vertebra (L5),
creating two zygapophyseal joints, which are synovial plane joints.
2. Which structure is depicted in figure 2?
A. Sacral hiatus
B. Sacral foramina
C. Sacral cornua
D. Sacral canal
The answer is D, sacral canal, which is a hollow opening that serves as a continuation of the vertebral canal
above, and it houses the sacral nerves.
3. Which structure is depicted in figure 3?
A. Sacral crest
B. Sacral apex
C. Dorsal sacral foramina
