Flashcards in Sacrum Deck (21):
What is the typical number of segments that unite to form the adult sacrum?
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 process 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 process 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 the facet of S5?
The sacral cornu
What is the name of the inferior opening of the sacral spinal canal?
The sacral hiatus
What is the sacral hiatus?
The inferior opening of the sacral spinal canal which appears as an inverted V
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-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 ?
What is the name given to the openings what 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?
What feature is does the anterior surface of the superior epiphyseal rim of S1 form?
The sacral promontory
What is the sacral promontory?
The bulging anterior surface of the superior epiphyseal rim of S1
What is the name given to the region of bone extending laterally from the S1 vertebral body looking from the base view?
The sacral ala
What forms the sacral ala?
The costal element and true transverse process
What part of the sacral ala is derived from the costal element?
The anterior two-thirds