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Spinal Anatomy > 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 body features are present on the coccyx?

A

all segments are represented by a “vertebral body; Co1 has a coccygeal cornu and transverse process

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5
Q

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

A

coccygeal cornu

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6
Q

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

A

flexion-extension, 5-20 degrees

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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 nerve 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 is the location of the ganglion impar?

A

anywhere from the sacrococcygeal joint to the upper third of coccyx

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12
Q

What is the coccygeal glomus or coccygeal body?

A

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

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13
Q

What innervates the coccygeal glomus or coccygeal body?

A

both sympathetic and parasympathetic fibers are identified

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14
Q

What muscles attach to the coccyx?

A

ischiococcygeus and levator ani

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15
Q

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

A

deep posterior sacrococcygeal ligament

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16
Q

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

A

anterior sacrococcygeal ligament

17
Q

What is the homolog for the ligamentum flavum at Co1?

A

superficial posterior sacrococcygeal ligament

18
Q

What forms the inferior boundary for the spinal canal?

A

the union of the superficial posterior and deep posterior sacrcoccygeal ligaments

19
Q

What is the homolog for the capsular ligament at Co1?

A

intercornual ligament

20
Q

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

A

superficial posterior sacrococcygeal ligament and intercornual ligament

21
Q

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

A

deep posterior sacrococcygeal ligament an intervertebral disc

Spinal Anatomy (20 decks)

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