MOINA of Muscles Connecting the Scapula to the Humerus

Question 1

supraspinatus

Answer 1

origin: supraspinous fossa
insertion: greater tuberosity of the humerus; capsule of shoulder joint

nerve: suprascapular nerve

abducts arm and stabilizes shoulder joint

Question 2

infraspinatus

Answer 2

origin: infraspinous fossa
insertion: greater tuberosity of humerus; capsule of shoulder joint

nerve: subscapular nerve

laterally rotates and stabilizes shoulder joint

Question 3

teres minor

Answer 3

origin: upper two thirds of lateral border of scapula
insertion: greater tuberosity of humerus; capsule of shoulder joint

nerve: axillary nerve

laterally rotates arm and stabilizes shoulder joint

Question 4

subscapularis

Answer 4

origin: subscapular fossa
insertion: lesser tuberosity of humerus

nerve: upper and lower subscapular nerves

medially rotates arm and stabilizes shoulder joint

Question 5

deltoid

Answer 5

origin: lateral third of clavicle, acromion, and spine of scapula
insertion: middle of lateral surface of shaft of humerus

nerve: axillary nerve

middle fibers abduct the arm, anterior fibers flex and medially rotate the arm, posterior fibers extend and laterally rotate the arm

Question 6

teres major

Answer 6

origin: lower third of lateral border of scapula
insertion: medial lip of bicipital groove of humerus

nerve: lower subscapular nerve

medially rotates and adducts the arm; stabilizes the shoulder joint