A&P 4.4.17 - Sacrum and Coccyx
The anterosuperior margin of the _____ bulges forward into the pelvic cavity; this vertebral margin is known as the _____
1st sacral vertebra; sacral promontory
The Coccyx consists of _____ to form a small _____ bone that articulates superiorly with the _____
4 vertebrae fused together; triangular; sacrum
The sacrum consists of
5 fused vertebrae
The sacrum articulates superiorly with the _____ (via the _____) and inferiorly with the _____
L5 vertebrae; superior articular processes; coccyx
Laterally, the 2 wing-like _____ of the sacrum (fused remnants of the _____ of S1-5) articulate with the 2 _____ to form the _____
alae; transverse processes; hip bones; SI joints
The sacral foramina penetrate the sacrum and serve as a passageway for
blood vessels and nerves
Coccyx comes from the greek word meaning
cuckoo
Dorsally, the median sacral surface is roughened by the
median sacral crest (fused spinous processes of the sacral vertebrae)
The sacrum forms the _____ of the pelvis
posterior wall
The vertebral canal continues down the spine into the scrum as the
sacral canal (containing and protecting spinal cord and blood vessels)
Found on each side of the transverse lines
sacral foramina
The _____ is the external opening on the posterior aspect at the sacrum, and is a result of the unfused transverse processes of _____
sacral hiatus; s4/s5
The body's main center of gravity lies approximately 1 cm behind the _____
sacral promontory
Except for the _____, the coccyx really has no purpose
slight support of some pelvic organs
The sacrum _____ & _____ the pelvis
strengthens and stabilizes
The sacral hiatus represents
the end of the sacral canal
The sacrum is _____ in shape
triangular
The transverse lines are 4 ridges of _____ that cross the sacrum's concave anterior surface
vertebral fusions
