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Anatomy > Intrinsic Back Muscles > Flashcards

Intrinsic Back Muscles Flashcards

1
Q

what are the superficial intrinsic back muscles?

A

splenius capitis
splenius cervicis

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2
Q

what is the origin of splenius capitis

A

spinous processes of CV7 through TV6

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3
Q

what is the insertion of splenius capitis

A

mastoid process

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4
Q

what is the origin of the splenius cervicis

A

spinous process of CV7 through TV6

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5
Q

what is the insertion of splenius cervicis?

A

transverse processes of CV1-4

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6
Q

what is the nerve supply for splenius capitis and cervicis

A

dorsal rami of cervical nerve

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7
Q

what is the action of the supeerficial intrinsic back muscles

A

unilateral - lateral flexion toward same side
bilateral - extension of the neck

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8
Q

what is the name of the intermediate intrinsic back muscles

A

erector spinae

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9
Q

what are the muscles of the erector spinae from medial to lateral?

A

spinalis
longissimus
iliocostalis

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10
Q

what are the parts of the spinalis?

A

capitis, cervicis, thoracis

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11
Q

what is the origin of the spinalis? hint: what region does it begin

A

spinous process of inferior thoracic and lumbar regions

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12
Q

what is the insertion of the spinalis?

A

spinous processes of several vertebral levels superior

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13
Q

what elements do the longissimus attach to?

A

transverse processes to transverse processes several levels superior

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13
Q

what sections of the vertebral column does the iliocostalis span?

A

cervicis, thoracis, lumborum

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13
Q

where does the iliocostalis originate?

A

iliac crest
transverse processes

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14
Q

where does the iliocostalis insert?

A

ribs that are several vertebral levels superior

15
Q

what nerve innervates the erector spinae?

A

dorsal rami of thoracic and lumbar spinal nerve

16
Q

what actions do the erector spinae do?

A

unilateral - lateral flexion to same side
bilateral - extension of vertebral column

17
Q

what is the name of the deep intrinsic back muscles?

A

transverospinal muscles

18
Q

what muscles make up the transverospinal muscles? superficial to deep

A

semispinalis
multifidus
rotatores

19
Q

how do the fibers of the semispinalis extend?

A

several vertebral levels superior

20
Q

how do the fibers of the multifidus extend?

A

about four vertebral levels superior

21
Q

how do the fibers of the rotatores extend?

A

one vertebral level superior

22
Q

what nerve supplies the transverospinal muscles?

A

segmental dorsal rami

23
Q

what actions do the transverospinal muscles do? which one is special? why?

A

extension of vertebral column
rotation
rotatores assist in rotation.
rotation is the opposite of contraction.

24
Q
A

Anatomy (19 decks)

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