MSK 1 - Shoulder and Scapula Flashcards

1
Q

What does the shoulder girdle consist of?

A

scapula, clavicle and all muscles attached to these

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2
Q

Superficial muscles of posterior shoulder

A
  • trapezius

- lattismus dorsi

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3
Q

Deep muscles of posterior shoulder

A
  • levator scapulae
  • rhomboid minor
  • rhomboid major
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4
Q

Action and innervation of trapezius

A
  • lifts arm above shoulder

- accessory nerve

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5
Q

Action and innervation of lattismus dorsi

A
  • extends, adducts, medial rotation of arm

- thoracodorsal nerve

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6
Q

What innervates all of the deep muscles in the posterior shoulder?

A

dorsal nerve of the scapula

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7
Q

What do the rhomboid major and minor do?

A

retract scapula

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8
Q

Intrinsic muscles of the shoulder - action and innervation

A
  • deltoid: abducts arm 15-90 - axillary nerve

- teres major: adducts shoulder - subscapular nerve

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9
Q

What does the axillary nerve supply in the shoulder?

A
  • deltoid

- teres minor

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10
Q

Rotator cuff muscles

A
  • subscapularis
  • infraspinatus
  • supraspinatus
  • teres minor
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11
Q

Nerve supply of all but one of the rotator cuffs

A

SUBSCAPULAR NERVE

  • teres minor: axillary nerve
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12
Q

Action of supraspinatus and infraspinatus

A

S: abduct arm 0-15
I: lateral rotation of arm

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13
Q

Which muscles laterally rotate the arm?

A
  • infraspinatus

- teres minor

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14
Q

What does the subscapularis do?

A

medially rotates arm

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15
Q

Ball and socket joint of the shoulder allows what?

A

flexibility and RANGE OF MOVEMENT

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16
Q

Resting tone of posterior rotator cuff muscles allows..

A

head of humerus to be pulled into shoulder joint

17
Q

What deepens the cavity of the shoulder?

A

glenoid labrum

18
Q

What nerve can be damaged as a result of shoulder dislocation?

A

axillary nerve

  • paralysis of deltoid
19
Q

Humerus fracture will affect what nerve?

A

radial nerve - winds round spiral groove of humerus