Flashcards in Sacrum Deck (43)
What part of the sacral ala is derived from the costal element?
the anterior two-thirds
The costal element and true transverse process of sacrum unite to form what feature?
the sacral ala
How many fibrous (amphiarthrosis) syndesmosis joint surfaces are present on the S1 vertebral body?
How many joint surfaces are present on the vertebral body of the first sacral segment?
What muscle(s) may attach to the first sacral vertebral body?
What is the reported angulation of the first sacral articular facets?
they lie vertically in the coronal plane
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?
From the anterior view, the intervertebral discs of sacrum will be replaced by what features?
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
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 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
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
What is the name of the joint formed by the sacral tuberosity?
the accessory sacro-iliac joint
What muscle is said to attach to the dorsal surface of the sacrum?
What feature is identified on the lateral surface of S1-S3?
What classification of joint is formed by the auricular surface of sacrum?
synovial plane (diarthrosis arthrodia)
What feature does the anterior surface of the superior epiphyseal rim of S1 form?
the sacral promontory
What ligament is attached to the sacral hiatus?
the superficial posterior sacrococcygeal ligament
How many synovial joints are typically present at sacrum?
What joint classifications are typically present at sacrum?
fibrous (amphiarthrosis) syndesmosis,cartilaginous (amphiarthrosis) symphysis and synovial plane (diarthrosis arthrodia)
What forms the posterior boundary for the fifth sacral spinal nerve intervertebral foramen?
sacral cornu, coccygeal cornu, superficial posterior sacrococcygeal ligament and intercornual ligament