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Spinal Anatomy Exam 2 > Coccyx > Flashcards

Coccyx Flashcards

1
Q

What is the number of coccygeal somites?

A

ten

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2
Q

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

A

4 segments

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3
Q

When is ossification of coccyx completed?

A

about age 30

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4
Q

What is the direction of the fusion of coccygeal segments?

A

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

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5
Q

What is the direction of the coccygeal curve?

A

posterior (kyphotic)

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6
Q

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

A

flexion-extension, 5-20 degress

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7
Q

How many coccygeal nerves are present in the fetus?

A

typically 5 pairs of coccygeal nerves are present

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8
Q

How many coccygeal nerves are present in the adult?

A

typically only one pair of coccygeal nerves remain in the adult

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9
Q

What forms the coccygeal nerves plexus?

A

S4, S5 and Co1 nerves

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10
Q

What is the ganglion impar?

A

a midline sympathetic ganglion

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11
Q

What innervates the coccygeal glomus or coccygeal body?

A

both sympathetic and parasympathetic fibers are indentified

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12
Q

What joint classifications are present for coccyx?

A

cartilaginous (amphiarthrosis) symphysis and fibrous (amphiarthrosis) syndesmosis

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13
Q

What ligaments of the vertebral column will be attached to the coccyx?

A

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

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14
Q

What is the homolog for the posterior longitudinal ligament at Co1?

A

deep posterior sacrococcygeal ligament

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15
Q

What is the homolog for the ligamentum flavum at Co1?

A

superficial posterior sacrococcygeal ligament

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16
Q

What forms the inferior boundary for the spinal canal?

A

the union of the superifical posterior and deep posterior scarococcygeal ligaments

17
Q

What muscles attach to the coccyx?

A

ischiococcygeus and levator ani

18
Q

What joint classifications are presentfor the coccyx?

A

cartilaginous (amphiarthrosis) symphysis and fibrous (amphiarthrosis) syndesmosis

19
Q

What forms the posterior boundary for the first occygeal spinal nerve intervertebral foramen?

A

sacral cornu, coccygeal cornu, superifical posterior sacrococcygeal ligament, intercrnual ligament

20
Q

What forms the anterior boundary for the first coccygeal spinal nerve intervertebral foramen?

A

vertebral body S5,vertebral body of Co1, deep posterior sacrococcygeal ligament, intervertebral disc

Spinal Anatomy Exam 2 (22 decks)

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