Scapula to Humerus

Question 1

Deltoid

Answer 1

Origin: lateral third of clavicle, acromion, spine of scapula
Insertion: middle of lateral surface of shaft pf humerus
Nerve: Axillary Nerve
Action: abducts arm, anterior fibers flex and medially rotates arm, posterior fibers extend and laterally rotates arm

Question 2

Supraspinatus

Answer 2

Origin: supraspinous fossa of scapula
Insertion: greater tuberosity of humerus; capsule of shoulder joint
Nerve: suprascapular nerve
Action: abducts arm and stabilizes shoulder joint

Question 3

Infraspinatus

Answer 3

Origin: infraspinatus fossa of scapula
Insertion: greater tuberosity of humerus; capsule of shoulder joint
Nerve: suprascapular nerve
Action: laterally rotates arm and stabilizes shoulder joint

Question 4

Teres Major

Answer 4

Origin: lower third of lateral border of scapula
Insertion: medial lip of bicipital groove of humerus
Nerve: lower subscapular nerve
Action: medially rotates and adducts arm and stabilizes shoulder joint

Question 5

Teres Minor

Answer 5

Origin: upper two thirds of lateral border of scapula
Insertion: greater tuberosity of humerus; capsule of shoulder joint
Nerve: axillary nerve
Action: laterally rotates arm and stabilizes shoulder joint