Scapulohumeral Muscles

Question 1

Label the scapohumeral muscles.

Answer 1

Deltoid
Supraspinatous
Infraspinatous
Teres Minor
Teres Major
Subscapularis

Question 2

Which muscles make up the rotator cuff?

Answer 2

Supraspinatus, infraspinatus, teres minor and subscapularis.

Question 3

Deltoid - PA, DA, N/S and Action

Answer 3

PA = Lateral third of clavicle, acromion and spine of scapula

DA = Deltoid tuberosity of humerus

N/S = Axillary nerve

Action = Anterior - Flexes and medially rotates the Arm

Middle part - abducts arm

Posterior - extends and laterall rotates arm

Question 4

Teres Major - PA, DA, N/S and Action

Answer 4

PA = posterior surface of inferior angle of scapula

DA = medial lip of the intertubercular groove

N/S = lower subscapular nerve

Action - adducts and medially rotates the arm

Question 5

Which muscle of the rotator cuff isnt a rotator of the humerus?

Answer 5

All muscles except the supraspinatus rotates the humerus, it only abducts the humerus.

Question 6

Which muscle is often associated with shoulder impingement syndromes?

Answer 6

The supraspinatus

Question 7

Supraspinatus - PA, DA, N/S and Action

Answer 7

PA = Supraspinous fossa of scapula

DA = Superior facet of greater tubercle of humerus

N/S - Suprascapular nerve

Action - Initiates and assists deltoid in abduction of arm, stablises GH joint

Question 8

Infraspinatus - DA, PA, N/S and Action

Answer 8

PA = Infraspinous fossa of scapula

DA = Middel facet of the greater tubercle of the humerus

N/S - Suprascapular nerve

Action = Laterally rotates humerus, stabilises GH joint

Question 9

Teres Minor - PA, DA, N/S and Action

Answer 9

PA = middle part of the lateral border of the scapula

DA = inferior facet of the greater tubercle of the humerus

N/S = Axillary nerve

A = Laterall rotates humerus, stabilises GH joint

Question 10

Subscapularis - PA, DA, N/S and Action

Answer 10

PA = Subscapular fossa

DA = Lesser tubercle of the humerus

N/S = Upper & Lower subscapular nerves

Action - Medially rotates arm, stabilises GH joint.

Question 11

“The lady sits between two majors”, what is this a trick for?

Answer 11

This is a trick to remember which muscles attach to the intertubercular groove.

The lady are the lats and the major is the teres major to the medial lip and the pec major to the lateral lip.