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Spinal Anatomy Exam 2 > Coccyx > Flashcards

Flashcards in Coccyx Deck (17):
1

What is the number of coccygeal somites

ten

2

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

4 segments

3

When is ossification of coccyx completed?

30 years old

4

What bony features are present on the coccyx?

all segments are represent by a "vertebral body"; Co1 has a coccygeal cornu and transverse process

5

What is the homolog of the superior articular process and facet on Co1?

coccygeal cornu

6

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

flexion - extension, 2-20 degrees

7

How many coccygeal nerves are present in the fetus?

typically 5 pairs of coccygeal nerves are present

8

How many coccygeal nerves are present in the adult?

typically only one pair of coccygeal nerves remain in the adult

9

What forms the coccygeal nerve plexus?

S4, S5 and Co1 nerves

10

What is the ganglion impar?

a midline sympathetic ganglion

11

What is the location of the ganglion impar?

anywhere from the sacrococcygeal joint to the upper thrid of the coccyx

12

What is the coccygeal gloms or coccygeal body?

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

13

What muscles attach to the coccyx?

ischiococcygeus and levator ani

14

What forms the inferior boundary for the spinal canal?

the union of the superficial posterior and deep posterior sacrococcygeal ligaments

15

What is the homolog for the capsular ligament at Co1?

intercornual ligament

16

What ligaments form the posterior boundary for the Co1 spinal nerve intervertebral foramen?

superficial posterior sacrococcygeal ligament and intercornual ligament

17

What ligaments form the anterior boundary for the Co1 spinal nerve intervertebral foramen?

deep posterior sacrococcygeal ligament an intervertebral disc