Flashcards in Coccyx Deck (21):
What is the number of coccygeal somites?
What is the typical number of segments that unite to form the adult coccyx?
When is ossification of coccyx completed?
About age 30
What is the homolog of the superior articular process and facet on Co1?
What is the major motion and range of motion for coccyx?
Flexion - extension, 5-20 degrees
How many coccygeal nerves are present in the fetus?
Typically 5 Paris of coccygeal nerves are present
How many coccygeal nerves are present in the adult?
Typically only one pair of coccygeal nerves remain in the adult
What is the ganglion impar?
A midline sympathetic ganglion
What is the coccygeal glomus or coccygeal body?
An enlarged encapsulated arteriovenous anastomosis located near the last segment of coccyx
What innervates the coccygeal glomus or coccygeal body?
Both sympathetic and parasympathetic fibers are IDed
What muscles attach to the coccyx?
Ischiococccygeus and levator ani
What is the homolog for the posterior longitudinal ligament at Co1?
Deep posterior sacrococcygeal ligament
What is the homolog for the anterior longitudinal ligament at Co1?
Anterior sacrococcygeal ligament
What forms the inferior boundary of the spinal canal?
The union of the superficial posterior and deep posterior sacrococcygeal ligaments
What is the homolog for the capsular ligaments at Co1?
What ligaments form the posterior boundary for the Co1 spinal nerve intervertebral Foramen?
Superficial posterior sacrococcygeal ligament and intercornual ligament
What ligament form the anterior boundary for the Co1 spinal nerve intervertebral Forman?
Deep posterior sacrococcygeal ligament and intervertebral disc
What bony features are present on the coccyx?
All segments are represented by a "vertebral body; Co1 has a coccygeal Cornu and TVP"
What forms the coccygeal nerve plexus?
S4, S5 an dCo1 nerves
What is the location of the ganglion impar?
Anywhere from the sacrococcygeal joint to the upper third of coccyx