Shoulder Girdle

Question 1

Deltoid

Answer 1

O: clavicle, acromion and spine of the scapula.
I: Deltoid tuberosity of the humerus.
N: Axillary nerve.
A: Shoulder abduction, flexion, and extension.

Question 2

Pectoralis Major

Answer 2

O: Clavicular head-clavicle. Sternocostal head-sternum, superior 6 costal cartilages, the aponeurosis of the external obliques muscle.
I: Intertubercular groove of the humerus.
N: Lateral and medial pectoral nerves. Clavicular head-C5, C6. Sternocostal head-C7, C8, T1.
A: Adducts and medially rotates humerus, draws scapula anteriorly and inferiorly.

Question 3

Latissimus Dorsi

Answer 3

O: T7-L5, thoracolumbar fascia, iliac crest, bottom 3 or 4 ribs, scapula
I: Intertubercular groove of humerus
N: Thoracodorsal nerve C6-C8
A: Adducts, extends, and internally rotates arm

Question 4

Infraspinatus

Answer 4

O: Scapula (infraspinous fossa)
I: Humerus (greater tubercle)
N: Suprascapular nerve
A: Lateral rotation of arm, stabilization of humerus.

Question 5

Teres minor

Answer 5

O: Lateral border of scapula
I: Greater tubercle of humerus
N: Axillary nerve (C5-C6)
A: laterally rotates arm, Adducts forearm, stabilizes humerus.

Question 6

Teres major

Answer 6

O: Inferior angle of scapula
I: Intertubercular groove of humerus
N: Lower subscapular nerve (C6, C7)
A: Adducts, medially rotates, and extends arm.

Question 7

Coracobrachialis

Answer 7

O: Coracoid process of scapula
I: Medial humerus
N: Musculocutaneous nerve (C5, C6, and C7)
A: Adducts arm, flexes arm at glenohumeral joint

Question 8

Subscapularis

Answer 8

O: Subscapular fossa
I: Lesser tubercle of humerus
N: Upper and lower subscapular nerves (C5, C6)
A: Rotates humerus medially, stabilizes shoulder

Question 9

Supraspinatus

Answer 9

O: Supraspinatus fossa of scapula
I: Greater tubercle of humerus
N: Suprascapular nerve
A: Abduction of arm and stabilizes humerus

Question 10

Subclavius

Answer 10

No info