Glenohumeral Muscles

Question 1

Anterior Deltoid

Answer 1

Origin: lateral 1/3 clavical
Insertion: deltoid tuberosity humerus
Action: Add GH 60 abd, flex GH, IR GH, Horiz Add GH
Innervation:Axillary (C5-C6)

Question 2

Middle Deltoid

Answer 2

Origin:acromion
Insertion: deltoid tuberosity
Action:abd GH
Innervation:axillary (C5-C6)

Question 3

Posterior Deltoid

Answer 3

Origin:scapular spine
Insertion: deltoid tuberosity humerus
Action: Add GH 60 abd, extend GH, ER GH, Horiz Abd GH
Innervation: Axillary N (C5-C6)

Question 4

Latissimus Dorsi

Answer 4

Origin: Lower thoracic SP, Thoracolumbar fascia
Insertion: medial border bicipital groove
Action: Add gh, Ext gh, IR gh, Horiz Abd gh, Retract scap, DR scap, Depress scap
Innervation: Thoracodorsal Nerve (C6-8)

Question 5

Teres Major

Answer 5

Origin: Inferior angle scap
Insertion: medial border bicipital groove
Action: Add gh, Ext gh, IR gh, Horizon Abd GH
Innervation: Lower Subscapular (C5-C6)

Question 6

Pectoralis Major Clavicular

Answer 6

Origin: Medial 1/2 clavicle
Insertion: lateral border bicipital groove
Action: IR gh, Flex gh, horiz add gh, add if 90
Innervation: Med (C8-T1) & Lateral (C5-T1) Pectoral Nerve

Question 7

Pectoralis Major Sternal

Answer 7

Origin: Sternum, ribs 2-6
Insertion: lateral border bicipital groove
Action: Ext gh if >30 flex, flex gh if hyperextended, IR gh, horz Add gh, Add gh, protract scap, DR scap
Innervation:Med (C8-T1) & Lateral (C5-T1) Pectoral Nerve

Question 8

Coracobrachilalis

Answer 8

Origin:Coracoid process scap
Insertion:humerus
Action: flex gh, add gh horz add gh
Innervation: musculocutaneous n (C5-C7)