Coccyx Flashcards Preview

Spinal Anatomy I - Exam 2 > Coccyx > Flashcards

Flashcards in Coccyx Deck (17):
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

3

When is ossification of coccyx completed?

about age 30

4

What bony features are present on the coccyx?

- all segments are represented by a vertebral body
- Co1 has a coccygeal cornu and TVP

5

What parts of the vertebra are missing from coccyx?

- pedicle
- lamina-pedicle junction
- lamina
- spinous process

6

What is the direction of fusion of coccygeal segments?

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

7

What is the direction of the coccygeal curve?

posterior (kyphotic)

8

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

flexion-extension, 5-20 degrees

9

How many coccygeal nerves are present in the fetus?

typically 5 pairs of coccygeal nerves are present

10

How many coccygeal nerves are present in the adult?

typically only 1 pair of coccygeal nerves remain in the adult

11

What forms the coccygeal nerve plexus?

S4, S5, and Co1 nerves

12

What is the ganglion impar?

a midline sympathetic ganglion

13

What is the location of the ganglion impar?

anywhere from the sacrococcygeal joint to the upper third of coccyx

14

What is the coccygeal glomus or coccygeal body?

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

15

What innervates the coccygeal glomus or coccygeal body?

both sympathetic and parasympathetic fibers are identified

16

What joint classifications are present for coccyx?

- cartilaginous (amphiarthrosis) symphysis
- fibrous (amphiarthrosis) syndesmosis

17

What lig. of the vertebral column will be attached to coccyx?

- anterior sacrococcygeal
- superficial posterior sacrococcygeal
- deep posterior sacrococcygeal
- posterior sacrococcygeal
- intercornual
- anococcygeal
- sacrospinous
- sacrotuberous
- short posterior sacro-iliac
- long posterior sacro-iliac
- intervertebral disc