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Anatomy > Deep Back Muscles > Flashcards

Deep Back Muscles Flashcards

1
Q

What are the muscles that make up the deep back?

A

Splenious capitus, splenious cervicis, erector spinae (3 muscles), transversospinalis (3 muscles), and suboccipital.

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2
Q

What innervates the deep back muscles?

A

Dorsal rami of spinal nerves.

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3
Q

What is the origin of the splenious capitis?

A

Lower half of the liamentum nuchae, spinous processes C7-T4.

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4
Q

What is the insertion of the splenious capitis?

A

Mastoid process of the skull and below the lateral 1/3 of the superior nuchal line.

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5
Q

What are the actions of the splenious capitis?

A

Bilateral contraction - extension of the neck

Unilateral contraction - Draw and rotate the head to one side

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6
Q

What innervates the splenious capitis?

A

Segmentally by the dorsal rami of cervical nerves.

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7
Q

What is the origin of the splenious cervicis?

A

Spinous processes T3-T6.

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8
Q

What is the insertion of the splenious cervicis?

A

Transverse processes C1-C3.

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9
Q

What are the actions of the splenious cervicis?

A

Bilateral contraction - extension of the neck.

Unilateral contraction - draw and rotate the head to one side.

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10
Q

What innervates the splenious cervicis?

A

Segmentally by the dorsal rami of the cervical nerves.

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11
Q

What 3 muscles make up the erector spinae?

A

Iliocostalis, Longissimus, and Spinalis.

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12
Q

What is the origin of the iliocostalis?

A

Ilium and ribs.

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13
Q

What is the origin of the longissimus?

A

Transverse processes.

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14
Q

What is the origin of the spinalis?

A

Spinous processes.

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15
Q

What is the insertion of the iliocostalis?

A

Ribs and Transverse processes.

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16
Q

What is the insertion of the longissimus?

A

Transverse processes.

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17
Q

What is the insertion of the spinalis?

A

Spinous processes.

18
Q

What are the actions of the erector spinae?

A

Bilateral contraction - extension of the vertebral column and controls posture.
Unilateral contraction - Lateral flexion of vertebral column.

19
Q

What innervates the erector spinae muscles?

A

Segmentally by the dorsal rami of the spinal nerves.

20
Q

What 3 muscles make up the transversospinalis?

A

Semispinalis, Multifidus, and Rotatores.

21
Q

What is the origin of the transversospinalis muscles?

A

All originate from transverse processes of vertebrae.

22
Q

What is the insertion of the transversospinalis muscles?

A

All insert upon the spines of vertebrae, superior to origin. Each muscle spans a different length of vertebrae.

23
Q

What are the actions of the transversospinalis muscles?

A

Bilateral contraction - extension of the vertebral column
Unilateral contraction - Rotation of the vertebral column to contralateral side of the contracting muscle or muscle group.

24
Q

What innervates the transversospinalis muscles?

A

Segmentally by dorsal rami of the thoracolumbar spinal nerve.

25
Q

What 4 muscles make up the suboccipital?

A

Rectus Capitis Posterior Major and Minor, and Obliquus Capitis Superior and Inferior.

26
Q

What is the origin of the Rectus Capitis Posterior Major?

A

Spinous process of the axis vertebrae (C2).

27
Q

What is the origin of the Rectus Capitis Posterior Minor?

A

Posterior tubercle of the atlas vertebrae (C1).

28
Q

What is the origin of the Obliquus Capitis Superior?

A

Transverse process of axis vertebrae (C2).

29
Q

What is the origin of the Obliquus Capitis Inferior?

A

Spinous process of axis vertebrae (C2).

30
Q

What is the insertion of the Rectus Capitis Posterior Major?

A

Lateral part of the inferior nuchal line of the occipital bone.

31
Q

What is the insertion of the Rectus Capitis Posterior Minor?

A

Medial part of the inferior nuchal line of the occipital bone.

32
Q

What is the insertion of the Obliquus Capitis Superior?

A

Occipital bone. (Lateral half inferior nuchal line)

33
Q

What is the insertion of the Obliquus Capitis Inferior?

A

Transverse process atlas vertebrae (C1).

34
Q

What are the actions of the Rectus Capitis Posterior Major?

A

Extension of the head, and ipsilateral rotation of the head.

35
Q

What are the actions of the Rectus Capitis Posterior Minor?

A

Extension of the head.

36
Q

What are the actions of the Obliquus Capitis Superior?

A

Extension of the head, and bends ipsilaterally.

37
Q

What are the actions of the Obliquus Capitis Inferior?

A

Ipsilateral rotation of the face.

38
Q

What innervates the suboccipital muscles?

A

Suboccipital nerve (posterior rami of C1).

39
Q

What muscles make up the suboccipital triangle?

A

Medial - Rectus Capitis Posterior Major
Lateral - Obliquus Capitis Superior
Inferior - Obliquus Capitis Inferior.

40
Q

What are some of the contents of the suboccipital triangle?

A

Vertebral artery, suboccipital nerve, suboccipital venous plexus.

Anatomy (60 decks)

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