Day 27 (Sacrum) Flashcards
What part of the sacral ala is derived from the costal element?
the anterior two-thirds
What part of the sacral ala is derived from the true transverse process?
the posterior third
How many fibrous (amphiarthrosis) syndesmosis joint surfaces are present on the S1 vertebral body?
four
How many cartilaginous (amphiarthrosis) symphysis joint surfaces are present on the S1 vertebral body?
one
How many fibrous (amphiarthrosis) syndesmosis joint surfaces are present on the S1 vertebral body?
four
What muscle(s) may attach to the first sacral vertebral body?
psoas major
What is the position of the sacral zygapophysis in adults?
the zygapophysis lies in the coronal plane for L5/S1
What is the orientation of the first sacral superior articular facet?
backward, upward, medial (BUM); typically concave
What is the name given to the projection on the first sacral superior articular process?
mammillary process
What muscles will attach to the sacral mammilary processes?
multifidis
What is the usual condition for the first sacral spinous process?
it is non-bifid and short
An imaginary line drawn along the dorsal midline of sacrum is identified as the ____.
median sacral crest
What is the name given to the congenital condition in which the fifth lumbar spinous process is elongated, the sacrum exhibits spina bifida, and dorsiflexion produces pain?
Knife Clasp Syndrome
An imaginary line drawn from the superior articular process of S1 to the sacral cornu will form what feature?
intermediate sacral crest
What features may be identified along the intermediate sacral crest?
the mammillary process of S1 and the sacral cornu of S5
