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Spinal Anatomy I - Exam 2 > Coccyx > Flashcards

Flashcards in Coccyx Deck (17)
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1
Q

What is the number of coccygeal somites?

A

10

2
Q

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

A

4

3
Q

When is ossification of coccyx completed?

A

about age 30

4
Q

What bony features are present on the coccyx?

A
  • all segments are represented by a vertebral body

- Co1 has a coccygeal cornu and TVP

5
Q

What parts of the vertebra are missing from coccyx?

A
  • pedicle
  • lamina-pedicle junction
  • lamina
  • spinous process
6
Q

What is the direction of fusion of coccygeal segments?

A
  • from caudal to cranial

- the last segments to fuse together are Co1 and Co2

7
Q

What is the direction of the coccygeal curve?

A

posterior (kyphotic)

8
Q

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

A

flexion-extension, 5-20 degrees

9
Q

How many coccygeal nerves are present in the fetus?

A

typically 5 pairs of coccygeal nerves are present

10
Q

How many coccygeal nerves are present in the adult?

A

typically only 1 pair of coccygeal nerves remain in the adult

11
Q

What forms the coccygeal nerve plexus?

A

S4, S5, and Co1 nerves

12
Q

What is the ganglion impar?

A

a midline sympathetic ganglion

13
Q

What is the location of the ganglion impar?

A

anywhere from the sacrococcygeal joint to the upper third of coccyx

14
Q

What is the coccygeal glomus or coccygeal body?

A

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

15
Q

What innervates the coccygeal glomus or coccygeal body?

A

both sympathetic and parasympathetic fibers are identified

16
Q

What joint classifications are present for coccyx?

A
  • cartilaginous (amphiarthrosis) symphysis

- fibrous (amphiarthrosis) syndesmosis

17
Q

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

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