Coccyx Flashcards
of coccygeal somites
10
typical # of segments that unite to form the adult coccyx
4
age ossification of coccyx is completed
about 30
the direction of fusion of coccygeal segments
from caudal to cranial, the last segments to fuse together are Co1 and Co2
direction of the coccygeal curve
posteror (kyphotic)
major motion and range of motion for the coccyx
flexion-extension, 5-20*
of coccygeal nerves present in the fetus
typically 5 pairs of coccygeal nerves are present
of coccygeal nerves present in an adult
typically only 1 pair of coccygeal nerves are present
forms the coccygeal nerve plexus
S4,5 and Co1 nerves
what is the ganglion impar
a midline sympathetic ganglion
what is the coccygeal glomus or coccygeal body
an enlarged encapsulated arteriovenous anastamosis located near the last segment of coccyx
innervates the coccygeal glomus or coccygeal body
both sympathetic and parasympathetic fibers are identified
what muscles attach to the coccyx
ischiococcygeus and levator ani
