Sacrum Flashcards
How many joint surfaces are present on the vertebral body of the first sacral segment?
Five
What joint classifications will be observed at the first sacral vertebral body?
Cartilaginous (amphiarthrosis) Symphysis
Fibrous (amphiarthrosis) Syndesmosis
What muscle(s) may attach to the first sacral vertebral body? (1)
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
From the anterior view, the intervertebral discs of sacrum will be replaced by what feature?
Transverse ridges
What forms the median sacral crest?
Fused spinous processes and their spinous tubercles
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 sacral hiatus?
The inferior opening of the sacral spinal canal
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 name of the joint formed by the sacral tuberosity?
The Accessory Sacro-Iliac Joint
What feature is associated with the transverse tubercle of S5?
The inferior and lateral (inferolateral) sacral angle
What feature is identified on the lateral surface of S1-S3?
Auricular surface
