Musculature And Innervation Of Upper Limb

Question 1

Trapezius

Answer 1

Innervation: Accessory nerve

Action: Extension of the head, elevation and depression of scapula and glenoid

Positions the pectoral girdle (posterior)

Question 2

Levator scapulae

Answer 2

Innervation: Dorsal scapular nerve

Action: Retracts scapula, depresses glenoid

Positions the pectoral girdle (posterior)

Question 3

Rhomboideus major

Answer 3

Innervation: Dorsal Scapular nerve

Action: Retracts scapula, depresses glenoid

Positions the pectoral girdle (posterior)

Question 4

Rhomboideus minor

Answer 4

Innervation: Dorsal Scapular nerve

Action: Retracts scapula, depresses glenoid

Positions pectoral girdle (posterior)

Question 5

Serratus anterior

Answer 5

Innervation: Long thoracic nerve

Action: Rotates and protects scapula, elevates glenoid

Positions pectoral girdle (posterior)

Question 6

Subclavius

Answer 6

Originates on the ribs

Inserts on clavicle

Positions the pectoral girdle (anterior)

Question 7

Pectoralis minor

Answer 7

Innervation: Medial Pectoral nerve

Action: Stabilization of scapula

Positions the pectoral girdle (anterior)

Question 8

Pectoralis major

Answer 8

Origin: Body of sternum, inferno-medial clavicle

Insertion: Greater tubercular crest of humerus

Innervation: Medial and lateral pectoral nerves

Moves the arm

Question 9

Deltoid

Answer 9

Origin: Lateral half of clavicle, Scapular spine, acromion process

Insertion: Deltoid tuberosity of humerus

Innervation: Axillary nerve

Action: Abducts humerus (also flexes, extends, rotates and adducts)

Move the arm

Question 10

Latissimus dorci

Answer 10

Origin: T7- T12, thoracolumbar fasciae

Insertion: Intertubercular groove of humerus (anterior)

Innervation: Thoracodorsal nerve

Action: Extension, adduction, and medial rotation of humerus

Move the arm

Question 11

Groups of pectoral girdle musculature

- muscles of the shoulders and upper limbs

Answer 11

Groups

• Muscles that position the pectoral girdle
• Muscles that move the arm
• Muscles that move the forearm and hand

Question 12

Rotator cuff muscles

Answer 12

Muscles involved in shoulder rotation:

• Supraspinatus
• Subscapularis
• Infraspinatus
• Teres Minor

(SITS)
Muscles that move the arm

Question 13

Subscapularis

Answer 13

Origin: Deep surface of scapula

Insertion: Lesser tubercle of humerus

Innervation: Upper and Lower Subscapular nerves

Action: Medially rotates humerus

Muscles that move the arm

Question 14

Teres minor

Answer 14

Origin: Lower edge of scapula

Insertion: Greater tubercle of humerus

Innervation: Axillary nerve

Action: Laterally Rotates humerus

Muscles that move the arm

Question 15

Supraspinatus

Answer 15

Origin: Supraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Innervation: Suprascapular nerve

Action: Abducts humerus

Muscles that move the arm

Question 16

Infraspinatus

Answer 16

Origin: Infraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Innervation: Suprascapular

Action: Laterally rotates humerus

Muscles that move the arm

Question 17

Coracobrachialis

Answer 17

Makes up part of the mass of the proximal arm but doesn’t actually cross the elbow joint (scapula to humerus only)

Question 18

Coracobrachialis

Answer 18

Origin: Coracoid process

Insertion: Medial shaft of humerus

Innervation: Flexion and adduction of humerus

Action: Musculocutaneous nerve

Muscles that move the arm

Question 19

Teres major

Answer 19

Origin: Inferior edge of scapula

Insertion: Lesser tubercular crest

Innervation: Lower Subscapular

Action: Extends, adducts and medially rotates humerus

Muscles that move the arm

Question 20

Muscles that may originate from the scapula or brachium (humerus) that move the elbow cross _____ and ____ on the bones of the forearm

Answer 20

The joint, insert

Question 21

Elbow extensors

Answer 21

Origin:

• Long head: Infraglenoid tubercle
• Medial &Lateral heads: Posterior surface of humeral shaft

Insertion: Olecranon process of ulna

Innervation: radial nerve

Action: Extends elbow

Question 22

Biceps Brachii

Answer 22

Origin:

• Short head: Coracoid process
• Long head: Supragleniod tubercle

Insertion: Radial tuberosity on proximal radius

Innervation: Musculocutaneous nerve

Action: flexes elbow, supinates

Elbow Flexors

Question 23

Brachialis

Answer 23

Origin: Anterior distal humerus

Insertion: Tuberosity of ulna

Innervation: Musculocutaneous nerve and radial nerve

Action: flexes elbow

Elbow Flexors

Question 24

Brachioradialis

Answer 24

Origin: superior to later epicondylitis of humerus

Insertion: Lateral styled of radius

Innervation: Musculocutaneous nerve and radial nerve

Action: flexes elbow

Elbow Flexors

Question 25

Palmaris longus

Answer 25

Origin: Medial epicondyle of humerus Insertion: Palmar aponeurosis Innervation: Median nerve Action: flexes wrist (Superficial layer) Wrist Flexors

Question 26

Flexor digitorum superficialis

Answer 26

Origin: Medial epicondyle of humerus Insertion: Middle phalanges of fingers 2-5 Innervation: Median nerve Action: Flexes wristband middle phalanges (Intermediate layer) Wrist Flexors

Question 27

Flexor digitorum profundus

Answer 27

Origin: Anteromedial surface of ulna Insertion: Distal phalanges of fingers 2-5 Innervation: Median nerve Action: Flexes distal phalanges (Deep layer) Wrist Flexors

Question 28

Extensor digitorum

Answer 28

Origin: Lateral epicondyle of humerus Insertion: Distal phalanges of fingers 2-4 Innervation: Radial nerve Action: Extends fingers and wrist; abducts fingers (Superficial layer) Wrist Extensors

Question 29

Abductor pollicis longus

Answer 29

Origin: Posterior surface of radius and ulna Insertion: Base of 1st metacarpal Innervation: Radial nerve Action: Abducts and extends thumb (Deep layer) Wrist Extensors

Question 30

Supinator muscle

Answer 30

Origin: Lateral epicondyle of humerus Insertion: Proximal end of radius Innervation: Radial nerve Action: Supinates forearm

Question 31

Biceps brachii

Answer 31

Origin: - Short head: Coracoid process - Long head: Glenoid fossa Insertion: Proximal radius Innervation: Musculocutaneous nerve Action: Flexes elbow, supinates

Question 32

Pronation teres

Answer 32

Origin: Medial condyle humerus Insertion: Lateral radius (midshaft) Innervation: Median nerve Action: Pronates forearm