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MSK 2023 > Muscles of shoulder region > Flashcards

Muscles of shoulder region Flashcards

1
Q

Two divisions of muscles

A

Extrinsic

Intrinsic

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2
Q

Extrinsic muscles

A

Originate from torso (back of trunk) and insert onto bones of shoulder (clavicle, scapula, humerus)

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3
Q

Intrinsic muscles

A

Originate from scapula/clavicle and insert onto humerus

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4
Q

Extrinsic muscles named

A

Superficial: trapezius and lattisimus dorsi

Deep: levator scapulae, rhomboid major and minor

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5
Q

Trapezius O and I

A

O: occipital protuberance of skull, nuchal ligament, spinous processes C7-T12
I: Clavicle, acromion and spine of scapula

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6
Q

Trapezius action

A

Upper fibres elevate scapula and rotate during abduction above 90 degrees
Middle fibres retract scapula
Lower fibres pull scapula inferiorly

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7
Q

Trapezius innervation

A

Spinal accessory nerve (cranial nerve XI)

Proprioceptor fibres C3 C4

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8
Q

test trapezius

A

Shrug shoulders while someone is pushing down on them

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9
Q

Latissimus dorsi O and I

A

Deep to inferior fibres of trapezius
O: Spinous processes T6-T12, iliac crest, thoracolumbar fascia, inferior 3 ribs

I: Tendon into intertubercular sulcus of humerus

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10
Q

Actions and innervation lattisimus dorsi

A

Action: extends, adducts and medially rotates the shoulder joint
Innervation: Thoracodorsal nerve

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11
Q

Levator scapulae O and I

A

O: Tranverse processes C1-C4
I: Medial border of scapula

(deep to trapezius and superior to rhomboid minor)

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12
Q

Innervation and action levator scapulae

A

Action: elevates scapula
Innervation: Dorsal scapular nerve

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13
Q

Rhomboids

A

Rhomboid minor is superior to major but is smaller

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14
Q

Rhomboid minor O and I

A

O: Spinous processes C7-T1
I: Medial border scapula

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15
Q

Rhomboid minor action and innervation

A

Action: Retracts scapula rotates medial border (back to anatomical position after abduction above 90 degrees)

innervation: Dorsal scapular nerve

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16
Q

Rhomboid major o and I

A

O: Spinous processes T2-T5

I - medial border scapula

17
Q

Rhomboid major actions and innervations

A

Actions: Retracts scapula, rotates medial border (glenoid fossa rotated inferiorly, helps return to anatomical position after 90 degree+ abduction)

Innervation; Dorsal scapular nerve

18
Q

Intrinsic muscles known as

A

Scapulohumeral group

19
Q

Deltoid O and I

A

o: lateral 3rd anterior border clavicle, acromion and spine of scapula
I: deltoid tuberosity on humerus

20
Q

Deltoid actions

A

Anterior fibres: Flex and medially rotate arm at shoulder
Middle fibres: abduct arm from 15-90 degrees
Posterior fibres: extend and laterally rotate arm at shoulder

21
Q

Deltoid innervation

A

Axillary nerve

22
Q

Teres major O and I

A

O; Posterior inferior angle scapula
I: Medial lip of intertubercular groove

(inferior border of quadrangular space: axillary nerve and posterior circumflex humeral artery pass)

23
Q

Teres major action and innervation

A

Action: adducts and extends arm at shoulder, medially rotates arm
Innervation: Lower subscapular nerve

(goes from posterior and inserts anteriorly)

24
Q

Rotator cuff muscles

A

Originate from scapula
Attach to humeral head
Pull humeral head into glenoid fossa

25
Q

Rotator cuffs (4)

A

SITS

Supraspinatus
Infraspinatus
Teres minor
Subscapularis

26
Q

Supraspinatus O and I

A

O: Supraspinous fossa of scapula
I: greater tubercle of humerus

27
Q

Supraspinatus action and innervation

A

A: Abducts arm first 15 degrees
I: Suprascapular nerve

28
Q

Infraspinatus O and i

A

O; Infraspinous fossa of scapula

I: Greater tubercle of humerus (between supraspinatus and teres major)

29
Q

Infraspinatus A and I

A

A: Laterally rotates arm
I: Suprascapular nerve

30
Q

Subscapularis O and I

A

O: subscapular fossa
I: LESSER tubercle of humerus

31
Q

Subscapualris A and I

A

A: medially rotates
I: Upper and lower subscapular nerves

32
Q

Teres minor O and I

A

O: Posterior scapula
I: Greater tubercle humerus

33
Q

Teres minor A and I

A

A: Laterally rotates arm
I: Axillary nerve

MSK 2023 (55 decks)

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