coccyx

Question 1

what is the number of coccygeal somites?

Answer 1

10

Question 2

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

Answer 2

4 segments

Question 3

when is ossification of coccyx completed?

Answer 3

about age 30

Question 4

what is the direction of fusion of coccygeal segments?

Answer 4

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

Question 5

what is the direction of the coccygeal curve?

Answer 5

posterior (kyphotic)

Question 6

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

Answer 6

flexion - extension, 5-20 degrees

Question 7

how many coccygeal nerves are present in the fetus?

Answer 7

typically 5 pairs of coccygeal nerves are present

Question 8

what forms the coccygeal nerve plexus?

Answer 8

S4, S5 and Co1 nerves

Question 9

what is the ganglion impar?

Answer 9

midline symphathetic ganglion

Question 10

what is the coccygeal glomus or coccygeal body?

Answer 10

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