Exam 2- Coccyx

Question 1

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

Answer 1

4 segments

Question 2

When is ossification of coccyx complete

Answer 2

About age 30

Question 3

What is the direction of fusion of the coccygeal segments

Answer 3

From caudal to cranial, the last segment to fuse together are Co1 and Co2

Question 4

What is the direction of the coccygeal curve

Answer 4

Posterior (kyphotic)

Question 5

What is the major motion and range of motion for coccyx

Answer 5

Flexion-Extension 5-20 degrees

Question 6

How many coccygeal nerves are present in the fetus

Answer 6

Typically 5 pairs of coccygeal nerves are present

Question 7

How many coccygeal nerves are present in the adult

Answer 7

Typically only one pair of coccygeal nerves remain in the adult

Question 8

What forms the coccygeal nerve plexus

Answer 8

S4, S5 and Co1 nerves

Question 9

What is the ganglion impar

Answer 9

A midline sympathetic ganglion

Question 10

What innervated the coccygeal glomus or coccygeal body

Answer 10

Both sympathetic and parasympathetic fibers are identified

Question 11

What muscles attach to the coccyx

Answer 11

Ishiococcygeus and levator ani

Question 12

What is the number of coccygeal somites

Answer 12

Ten