VI: Coccyx Flashcards
What is the number of coccygeal somites?
ten
What is the typical number of segments that unite to form the adult coccyx?
4 segments
When is ossification of completed?
about age 30
What is the homolog of the superior articular process and facet on Co1?
coccygeal cornu
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 pairs of coccygeal nerves are present
What is the ganglion impar?
a midline sympathetic ganglion
What is the coccygeal glomus or coccygeal body?
an enlarged encapsulated ateriovenous anastomosis located near the last segment of the coccyx
What muscles attach to the coccyx?
ischiococcygeus and levator ani
What is the homolog for the posterior longitudinal ligament at Co1?
deep posterior sacrococcygeal lig.
What is the homolog for the anterior longitudinal lig. at Co1?
anterior sacrococcygeal lig.
What forms the inferior boundary for the spinal canal?
the union of the superficial posterior and deep posterior sacrococcygeal ligaments
What is the homolog for the capsular ligament at Co1?
intercornual lig.
What ligaments form the posterior boundary for the Co1 spinal nerve intervertebral foramen?
superficial posterior sacrococcygeal lig. and intercornual lig.
What ligaments form the anterior boundary for the Co1 spinal nerve intervertebral foramen?
deep posterior sacrococcygeal lig. an intervertebral disc
