Flashcards in Unit 2 - VI. Regions of the Vertebral Column: Sacrum/Coccyx/Misc. (Just Quizzies) Deck (86)
What muscle(s) may attach to the first sacral vertebral body?
How many joint surfaces are present on the vertebral body of the first sacral segment?
What is the origin of the sacral ala?
On base view, the S1 transverse process and costal element appear to originate from the vertebral body and possibly the pedicle to form the sacral ala.
What part of the sacral ala is derived from the costal element?
the anterior two-thirds
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 muscles will attach to the sacral mammillary processes?
Fusion of vertebral bodies of the sacrum across the intervertebral disc is called ___?
From the anterior view, the intervertebral discs of the sacrum will be replaced by what feature?
What forms the median sacral crest?
fused spinous processes and their spinous tubercles
What muscles may attach to the median sacral crest?
- latissimus dorsi
- iliocostalis lumborum
- longissimus thoracis
What forms the intermediate sacral crest?
fused articular processes and their facets
What features may be identified along the intermediate sacral crest?
- mammillary process of S1
- sacral cornu of S5
What does the sacral cornu represent?
the inferior articular process and facet of S5
What forms the lateral sacral crest?
the fused transverse processes and transverse tubercles from S1 to S5
What features may be identified along the lateral sacral crest?
- S1 transverse tubercle
- sacral tuberosity of S2
- transverse tubercles of S3-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 muscles may attach to the lateral sacral crest?
- iliocostalis lumborum
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 is the sacral promontory?
the bulging anterior surface of the superior epiphyseal rim of S1
The continuation of the anterior longitudinal ligament below S3 forms what ligament?
the anterior sacrococcygeal ligament
The continuation of the posterior longitudinal ligament below S3 forms what ligament?
the deep posterior sacrococcygeal ligament
What forms the posterior boundary for the fifth sacral spinal nerve intervertebral foramen?
- sacral cornu
- coccygeal cornu
- superfcial posterior sacrococcygeal ligament
- intercornual ligament
What forms the anterior boundary for the fifth sacral spinal nerve intervertebral foramen?
- vertebral body of S5
- vertebral body of Co1
- deep posterior sacrococcygeal ligament
- intervertebral disc
How many synovial joints are typically present at the sacrum?
What joint classifications are typically present at the sacrum?
- fibrous (amphiarthrosis) syndesmosis
- cartilaginous (amphiarthrosis) symphysis
- synovial plane (diarthrosis arthrodia)
What is the homolog for the ligamentum flavum at S5?
superficial posterior sacrococcygeal ligament