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CT MSK > Back Myology > Flashcards

Back Myology Flashcards

1
Q

The deep three layers of back muscle are called intrinsic muscles and are innervated by what nerve?

A

Posterior Rami

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2
Q

Trapezius Muscle

Origin: (4)

Insertion: (3)

Action: (5)

Nerve:

A

Origin

C7-T12, ligamentum nuchae, superior nuchal line, occipital protuberance

Insertion

Lateral 1/3 of clavical, acrominon, scapular spine

Action

Rotate glenoid cavity superiorly

Retract Scapula

Elevate Scapula

Depress Scapula

Rotate face AWAY from muscle

Remember: Rs Rf RED

Nerve

Spinal Accessory N

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3
Q

Latissimus Dorsi M.

Origin: (5)

Insertion:

Action: (4)

Nerve

A

Origin

SP of T6-T12, Ribs 9-12, Iliac crest, SP of L1-L5, Median Sacral crest via thoracolumbar fascia

Insertion

Intertubercular Groove of Humerus

Action

Rotate Glenoid Cavity Inferiorly

Extend Humerus

ADduct humerus

Medially Rotate Humerus

REMEBER: RiEAM

Nerve

Thoracodorsal N.

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4
Q

All of the muscles of layer 2, which include rhomboids minor, rhomboids major, and levator scapula are innervated by what nerve?

A

Dorsal Scapular N.

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5
Q

Rhomboid Major M

Origin:

Insertion:

Action: (3)

Nerve:

A

Origin

SP of T2-T5

Insertion

Medial border of scapula inferior to sacral spine

Action

Elevate Scaupla

Retract Scapula

Rotate glenoid cavity inferiorly

Nerve

Dorsal Scapular N.

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6
Q

Rhomboid Minor M

Origin: (2)

Insertion:

Action: (3)

Nerve:

A

Origin

SP of C7-T1 and lower part of ligamentum nuchae (previously supraspinatus)

Insertion

Medial border of scapula at scapular spine

Action

Elevate scapula

Retract scapula

Rotate glenoid cavity inferiorly

Nerve

Dorsal Scapular N.

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7
Q

Levator Scapula M.

Origin:

Insertion:

Action: (3)

Nerve:

A

Origin

Transverse process of C1-C4

Insertion

Medial border of scapula superior to scapular spine

Action: (3)

Elevate Scapula

Rotate glenoid cavity inferiorly

Laterally rotate neck

Nerve:

Dorsal Scapular N.

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8
Q

The following back muscles of layer 2 can rotate the glenoid cavity inferiorly like the Lats, as well as elevate the scapula like the trapezius. However, all but one of the muscles below is able to retract the scapula. What muscle is unable to retract the scapula?

A. Rhomboids Major M.

B. Rhomboids Minor M.

C. Levator Scapulae M.

A

Levator Scapulae M.

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9
Q

Serratus Posterior Superior M.

Origin: (2)

Insertion

Action

Nerve

A

Origin

Nuchal L. and SP of C7-T3

Insertion

Ribs 2-4 on superior part

Action

Elevate ribs during inspiration

Nerve

Intercostal N.

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10
Q

Serratus Posterior Inferior M.

Origin

Insertion

Action

Nerve

A

Origin

SP of T11-L2

Insertion

Ribs 8-12 on inferior surface

Action

Depress ribs during expiration

Nerve

Anterior Rami (T9-T12)

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11
Q

Both SErratus Posterior Superior and Splenius Capitis originate from what vertebrae?

A

Spinous process of C7-T3

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12
Q

Splenius Capitis M.

Origin: (2)

Insertion: (2)

Action: Bilaterally vs. Unilaterally

Nerve:

A

Origin

SP of C7-T3 and Lower 1/2 of Nuchal L.

Insertion

Mastoid Process and Nuchal Line

Action

Bilatteraly: Extend Neck

Unilaterally: Laterally flex neck and Rotate Face toward muscle

Nerve

Posterior Rami (C1-3)

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13
Q

Splenius Cervicis M.

Action and Innvervation is the same as Splenius Capitis

Origin

Insertion

A

Origin

SP of T3-6

Insertion

Transverse process of C1-3

Action

Bilatteraly: Extend Neck

Unilaterally: Laterally flex neck and Rotate Face toward muscle

Nerve

Posterior Rami (C5-7)

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14
Q

Layer 5 of the deep back muscles has 3 main muscle groups called the Erector Spinae. They all have the same action and innervation. What are these actions and innervations?

Action: (bilateral vs. unilateral)

Nerve:

A

Action

Bilaterally: Maintiain erect posture and extend vertebral column

Unilaterally: Laterally flex vertebral column

Nerve

Posterior Rami

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15
Q

Going from lateral to medial, what are the 3 groups of erector spinae muscles?

A

Iliocostalis

Longissimus

Spinalis

Remeber: I Love Spine

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16
Q

Which of the following muscles of the erector spinae is the only one with an associated lumborum muscle, but DOES NOT have an associated capitis muscle?

A

Iliocostalis M.

17
Q

T/F: Longissimus Muscles including Thoracis, Cervicis, and Capitis originate mostly from the Transverse process of vertebrae, while spinalis sits mainly on the Spinous process

A

True

18
Q

Layer 6 of the deep back muscles are Transversospinalis Group and are all innverated by what?

A

Posterior Rami

19
Q

The Semispinalis M. originates from the _________ of vertebrae and all act to ______ spine and _______ the spine ______ from the muscle

Semispinalis Thoracis M.

Semispinalis Cervicis M.

Semispinalis Capitis M.

A

The Semispinalis M. originates from the Transverse process of vertebrae and all act to extend spine and rotate the spine away from the muscle

20
Q

Which of the following correctly characterises the Multifidus M. extension from transverse process to spinous process? Where is the multifidus best developed?

A. 1 spinal segment

B. 2 spinal segments

C. 3-4 spinal segments

D. 5 or more spinal segments

A

3-4 spinal segments

Lumbar region

21
Q

What is the difference between back sprain and back strain?

A

Sprain: Relates to ligament damage usually from lack of stretching prior to activity

Strain: relates to muscle damage from excessive stressing

22
Q

What are the borders of the suboccipital triangle?

What are the contents within the triangle?

What nerve travels around the triangle?

A

Borders

Rectis Capitis Posterior Major M.

Obliquus Capitis Inferior M.

Obliquuis Capitis Superior M.

Contents

Vertebral A. and Suboccipital N.

Greater Occipital nerve travels around it

23
Q

Below are some deep muscles not exclusively associated with a back layer. All of the following are innervated by the posterior rami, except for which one which is instead innervated by the posterior portion of posterior rami and the anterior portion of the anterior rami?

A. Interspinalis M.

B. Intertransversearii M.

C. Levator Costorum Longus M.

D. Levator Costorum Brevis M.

A

Intertransversearii M.

24
Q
A

CT MSK (20 decks)

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