III. Vertebral Column: Sacrum Flashcards
What is the typical number of segments that unite to form the adult sacrum?
5 segments
An imaginary line drawn along the dorsal midline of sacrum is identified as the ____.
median sacral crest
What forms the median sacral crest?
fused spinous processes and their spinous tubercles
An imaginary line drawn from the superior articular process of S1 to the sacral cornu will form what feature?
intermediate sacral crest
What forms the intermediate sacral crest?
fused articular processes and their facets
What features may be identified along the intermediate sacral crest?
the mammillary process of S1 and the sacral cornu of S5
What is the remnant of the inferior articular process and facet of S5?
the sacral cornu
What is the name of the inferior opening of the sacral spinal canal?
the sacral hiatus
An imaginary line drawn from the transverse process of S1 to the inferior lateral sacral angle will form what feature?
the lateral sacral crest
What forms the lateral sacral crest?
the fused transverse processes and transverse tubercles from S1 to S5
What is the sacral tuberosity?
the enlarged transverse tubercle of S2
From the anterior view, the intervertebral discs of sacrum will be replaced by what feature?
transverse ridges
What is the name given to the openings that transmit the ventral sacral nerve rami?
anterior sacral foramina, ventral sacral foramina, or ventral pelvic foramina
What feature is identified on the lateral surface of S1-S3?
auricular surface
What feature does the anterior surface of the superior epiphyseal rim of S1 form?
the sacral promontory
