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Spinal Anatomy Exam 2 > coccyx > Flashcards

Flashcards in coccyx Deck (10):
1

what is the number of coccygeal somites?

10

2

what is the typical number of segments that unite to form the adult coccyx?

4 segments

3

when is ossification of coccyx completed?

about age 30

4

what is the direction of fusion of coccygeal segments?

from caudal to cranial, the last segments to fuse together are Co1 and Co2

5

what is the direction of the coccygeal curve?

posterior (kyphotic)

6

what is the major motion and range of motion for coccyx?

flexion - extension, 5-20 degrees

7

how many coccygeal nerves are present in the fetus?

typically 5 pairs of coccygeal nerves are present

8

what forms the coccygeal nerve plexus?

S4, S5 and Co1 nerves

9

what is the ganglion impar?

midline symphathetic ganglion

10

what is the coccygeal glomus or coccygeal body?

an enlarged encapsulated arteriovenous anastomosis located near the last segments of coccyx