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Flashcards in Coccyx Deck (14):
1

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

4 segments

2

When is ossification of coccyx completed?

about age 30

3

What is the direction of fusion of coccygeal segments?

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

4

What is the direction of the coccygeal curve?

posterior (kyphotic)

5

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

flexion - extension, 5-20 degrees

6

How many coccygeal nerves are present in the fetus?

typically 5 pairs of coccygeal nerves are present?

7

How many coccygeal nerves are present in the adult?

typically only one pair of coccygeal nerves remain in the adult

8

What forms the coccygeal nerve plexus?

S4, S5 and Co1 nerves

9

What is the ganglion impar?

a midline sympathetic ganglion

10

What is the coccygeal glomus or coccygeal body?

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

11

What articular facets of which vertebrae wlll be oriented backward, upward, and medial?

C1, C3-C7, L1-L5, S1

12

Superior articular facets of which segments will be oriented backward, upward, and lateral?

C2, T1-T12

13

Inferior articular facets of which segments will be oriented backward, medial, and downward?

C1

14

What is the number of coccygeal somites?

ten