Rotator Cuff Muscles

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rotator cuff muscles

-all insert into the capsule of the shoulder joint -all originate from the scapula -function is to dynamically stabilize the shoulder

Teres Minor Nerve

Axillary Nerve

Teres Minor Blood Supply

Circumflex Scapular Artery and Suprascapular Artery

Infraspinatus Origin

Infraspinous fossa

Pneumonic for the Rotator Cuff Muscles

S.I.T.S

Teres Minor Origin

bottom 2/3 of lateral border of the scapula

Supraspintus

does not rotate and it runs through the suprascapular notch

How many rotator cuff muscles are there?

four

Supraspintus Action

initiation of the abduction of humerus

Subscapularis Action

internal rotation of the humerus (this muscle is the strongest internal rotator)

Subscapularis Insertion

lesser tubercle of the humerus

Winging of the Scapula is caused by

loss of the long thoracic nerve

Subscapularis

most powerful internal rotator of the shoulder

If muscle inserts on Posterior Humerus

one gets lateral/external rotation

If muscle inserts on Anterior Humerus

one gets medial/internal rotation

Teres Minor Insertion

posterior greater tubercle, inferior to infraspinatus

Infraspinatus Insertion

posterior part of the greater tubercle (inferior)

Infraspinatus Action

shoulder external rotation and some adduction

Teres Minor Action

shoulder external rotation and some adduction

Subscapularis Artery

subscapular artery...splits into the thoracodorsal artery and Circumflex scapular arteries

Subscapularis Origin

subscapular fossa (smooth side of scapula

Supraspintus insertion

superior portion of the GREATER tubercle of the humerus

Infraspinatus Blood Supply

suprascapular artery

Supraspintus Blood Supply

suprascapular artery

Infraspinatus Nerve

suprascapular nerve

Supraspintus Nerve

suprascapular nerve

name the four rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis

Supraspintus Origin

supraspinous fossa

What does subscapular artery split into?

thoracodorsal artery and circumflex scapular arteries

Subscapularis Nerve

upper and lower subscapular nerve

loss of Long Thoracic Nerve results in

winging of the scapula


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