Sacrum Flashcards
What part of the sacral ala is derived from the costal elements
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
4
How many joint surfaces are present on the vertebral body of the first sacral segment
5
How many cartilaginous amphiarthrosis symphysis joint surfaces are present on the S1 vertebral body
1
How many fibrous amphiarthrosis syndesmosis joint surfaces are present on the S1 vertebral body
4
What muscles 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 mammillary process
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 conditrion 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
