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*** Muscles *** > Shoulder > Flashcards

Shoulder Flashcards

1
Q

Compartments

A

Extrinsic - superficial + deep
Intrinsic - rotator cuff + other

Extrinsic = originate from torso and attach to bones of the shoulder
Intrinsic = originate from scapula/clavicle and attach to humerus
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2
Q

Extrinsic superficial muscles

A

Trapezius

Latissimus dorsi

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3
Q

Trapezius

Origin

A

Skull, nuchal ligament + spinal processes of C3-4

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4
Q

Trapezius

Insertion

A

Clavicle, acromion and scapula spine

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5
Q

Trapezius

Innervation

A 
Motor = accessory nerve
Sensory = C3/4 spinal nerves
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6
Q

Trapezius

Function

A

Upper fibres = elevate/rotate scapula during abduction
Middle fibres = retract scapula
Lower fibres = pull scapula inferiorally

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7
Q

Latissimus dorsi

Origin

A

Spinous processes T6-12 and inferior 3 ribs

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8
Q

Latissimus dorsi

Insertion

A

Intertubercular sulcus of humerus

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9
Q

Latissimus dorsi

Innervation

A

Thoracodorsal nerve

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10
Q

Latissimus dorsi

Function

A

Extends, adducts and medially rotates upper limb

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11
Q

Extrinsic deep muscles

A

Levator scapulae
Rhomboid major
Rhomboid minor

All innervates by dorsal scapular nerve
All insert on the medial border of the scapula

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12
Q

Levator scapulae

Origin

A

Transverse processes of C1-4 vertebrae

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13
Q

Levator scapulae

Insertion

A

Medial border of scapula

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14
Q

Levator scapulae

Innervation

A

Dorsal scapular nerve

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15
Q

Levator scapulae

Function

A

Elevates scapula

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16
Q

Rhomboid major

Origin

A

Spinous processes of T2-5

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17
Q

Rhomboid major

Insertion

A

Medial border of scapula

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18
Q

Rhomboid major

Innervation

A

Dorsal scapular nerve

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19
Q

Rhomboid major

Function

A

Retracts and rotates the scapula

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20
Q

Rhomboid minor

Origin

A

Spinous processes of C7-T1 vertebrae

21
Q

Rhomboid minor

Insertion

A

Medial border of scapula

22
Q

Rhomboid minor

Innervation

A

Dorsal scapular nerve

23
Q

Rhomboid minor

Function

A

Retracts and rotates scapula

24
Q

Intrinsic muscles (non-rotator cuff)

A

Deltoid

Teres major

25
Q

Deltoid

Origin

A

Scapula + clavicle

26
Q

Deltoid

Insertion

A

Deltoid tuberosity on lateral surface of humerus

27
Q

Deltoid

Innervation

A

Axillary nerve

28
Q

Deltoid

Function

A 
Anterior = flex
Middle = abductor (0-15 degrees)
Posterior = extend
29
Q

Teres major

Origin

A

Posterior surface of inferior angle of scapula

30
Q

Teres major

Insertion

A

Intertubercular groove of humerus

31
Q

Teres major

Innervation

A

Lower subscapular nerve

32
Q

Teres major

Function

A

Adducts

Medially rotates

33
Q

Intrinsic rotator cuff muscles

A

Supraspinatus
Infraspinatus
Subscapularis
Teres minor

Originate from the scapula and attach to humeral head
Act to pull the humeral head into the glenoid fossa

34
Q

Supraspinatus

Origin

A

Supraspinous fossa of the scapula

35
Q

Supraspinatus

Insertion

A

Greater tubercle of the humerus

36
Q

Supraspinatus

Innervation

A

Suprascapular nerve

37
Q

Supraspinatus

Function

A

Abducts the arm 0-15 degrees

38
Q

Infraspinatus

Origin

A

Infraspinatous fossa of scapula

39
Q

Infraspinatus

Insertion

A

Less tubercule of the humerus

40
Q

Infraspinatus

Innervation

A

Suprascapular nerve

41
Q

Infraspinatus

Function

A

Laterally rotates

42
Q

Subscapularis

Origin

A

Subscapular fossa of scapula

43
Q

Subscapularis

Insertion

A

Greater tubercle of the humerus

44
Q

Subscapularis

Innervation

A

Upper/lower subscapular nerves

45
Q

Subscapularis

Function

A

Medially rotates

46
Q

Teres minor

Origin

A

Posterior surface of scapula

47
Q

Teres minor

Insertion

A

Greater tubercle of the humerus

48
Q

Teres minor

Innervation

A

Axillary nerve

49
Q

Teres minor

Function

A

Laterally rotates

*** Muscles *** (9 decks)

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