Deltoid & Teres Major

Question 1

Deltoid Origin

Answer 1

1. Anterior(clavicular) head: anterior surface of the lateral clavicle
2. Middle (acromial) head: acromion process

Question 2

Deltoid Insertion

Answer 2

Deltoid tuberosity of the humerus

Question 3

Deltoid Action

Answer 3

Anterior Head
1. At the (glenohumeral) shoulder joint
2. Medially rotates the arm at the (glenohumeral) shoulder joint

Middle Head
1. Abducts the arm at the (glenohumeral) shoulder joint

Question 4

Deltoid Innervation

Answer 4

Nerve to the muscle: Axillary nerve:

Nerve roots: C5 and C6

Question 5

Teres Major Origin

Answer 5

Lower later border and inferior angle of the scapula

Question 6

Teres Major Insertion

Answer 6

Medial lip of the intertubercular (bicipital) groove of the anterior humerus

Question 7

Teres Major Action

Answer 7

1. Adducts the arm at the shoulder (glenohumeral) joint
2. Medially rotates the arm at the shoulder (glenohumeral) joint
3. Extends the arm at the shoulder (glenohumeral) joint

Question 8

Teres Major Innervation

Answer 8

Nerve to the muscle: Lower subscapular nerve

Nerve roots: C5, C6, and C7