Anatomy of the Sacrum and Coccyx
How many pairs of sacral foramina does a sacrum typically have?
4 pairs
This is a large, winglike lateral mass located on each side of the sacral base
Ala
The sacrum is the only bony anatomy considered to be part of the ______ and ________ skeleton
Axial and appendicular
Where is the Sacrum located?
Directly inferior to the lumbar spine and between the 2 innominate bones, forming the posterior aspect of the pelvic cavity
Where is the Coccyx located?
Directly inferior to the sacrum
The sacrum has a wide base with the apex pointed ___________
Downward
The superior articular processes articulate with the inferior articular processes of L5 to form the........
Lumbosacral junction
The posterior surface of the sacrum is rough for what reason?
Muscle attachment
The anterior surface of the sacrum is ________
Relatively smooth
The vertebral foramen of the sacrum forms a descending tunnel called the _________
Sacral canal
What part of the sacrum provides passageways for the sacral nerves through the anterior and posterior sides of the sacrum
Sacral foramina
The superior articulating process on the superior aspect of the coccyx articulate with the inferior segment of the sacrum to form the ________________
Sacrococcygeal articulation
Laterally, the left and right borders of the superior articular processes articulate with the ilium to form the _______
Sacroiliac joints
This is a curved, inverted triangular bone that is formed by the fusion of the 5 sacral vertebral segments
Sacrum
The sacrum is _______ in females than males
Shorter
The coccyx is ________ shaped and consist of _____ vertebrae that fuse into one segment in an adult
Triangular, 3-5