Upper Limb and Chest

Question 1

Deltoid

Answer 1

• O: lateral 1/3 of clavicle, acromion, spine of scapula
• I: deltoid tuberosity of humerus
• A: anterior portion flexes, horizontally adduct, and medially rotates arm, middle portion abducts arm and the posterior portion extends, horizontally abduct, and laterally rotates the arm
• N: axillary (C5-C6)

Question 2

Teres Major

Answer 2

• O: dorsal surface of inferior angle of scapula
• I: medial lip of bicipital (intertubercular) groove of humerus
• A: adducts, medially rotates, and extends humerus (same as lats)
• Big helper to latissimus dorsi
• N: lower subscapular (C6-C7)

Question 3

Triceps (Long Head)

Answer 3

• O: Infraglenoid tuberosity of scapula
• I: olecranon of ulna and deep fascia of forearm
• A: extends forearm, assists in extending humerus
• N: radial (C6-C8)

Question 4

Supraspinatus

Answer 4

• O: supraspinous fossa of scapular
• I: superior facet of greater tuberosity of humerus
• A: assists deltoid in abducting arm (particularly important in initiation of abduction), fixes head of humerus in glenoid cavity; rotates head of humerus laterally (minor). Rotator cuff impingement, rotator cuff tendonitis.
• N: suprascapular (C5-C6)
• Moves arm in Abduction in first 30º

Question 5

Infraspinatus

Answer 5

• O: infraspinous fossa of scapula
• I: middle facet of greater tuberosity of humerus; capsule of shoulder joint
• A: laterally rotates arm
• N: suprascapular (C5-C6)

Question 6

Teres Minor

Answer 6

• O: superior portion of the lateral border of the scapula
• I: lowest facet of greater tuberosity of humerus
• A: rotates arm laterally and adducts arm
• N: axillary (C5-C6)

Question 7

Subscapularis

Answer 7

• O: subscapular fossa
• I: lesser tuberosity of humerus
• A: medially rotates and adducts arm. Inferior fibers depress humerus
• N: upper and lower subscapular (C5-C7)

Question 8

Pectoralis major

Answer 8

• O: medial ½ of clavicle, sternum to 6th costal cartilage, cartilages of ribs 2-6, aponeurosis of external oblique muscle
• I: lateral lip of intertubercular groove of humerus
• A: adducts, flex and medially rotates arm and horizontal ADDuction
• N: medial and lateral pectoral, clavicular head (C5, C6), sternocostal head (C7,C8,T1)

Question 9

Pectoralis Minor

Answer 9

• O: upper outer surface of ribs 3-5
• I: coracoid process of scapula
• A: stabilizes, and depresses scapula
• N: medial pectoral (C8-T1)- pierces the pec minor
o Works with trapezius to stabilize the arm

Question 10

Subclavius

Answer 10

• O: first rib cartilage
• I: groove on undersurface of clavicle
• A: draws clavicle down and forward
• N: nerve to subclavius (C5,C6)
o Dormant when you are resting, when you are running in helps with inspiration