Upper Limb- Muscle Groups

Question 1

Shoulder- Pectoral region & axilla

Answer 1

Pectoralis major
Clavicle, sternum, ribs 1-6 —> humerus interrubercular groove
Flexion, adduction, medial rotation of humerus
Nerve supply: c5-c6–> lateral pectoral nerve
c8-t1–> medial pectoral nerve
BV: Thoracic & thoracoacromial arteries

Subclavius
Rib 1 —> inf clavicle
Clavicle depression
N: C5-C6--> subclavian nerve
BV: thoracoacromial --> clavicula

Pectoralis Minor
Ribs 3-5 —> coracoid process
Scapula depression, rib elevation
N: C8-T1 --> medial pectoral
BV: thoracoacromia

Pectoralis major
Clavicle, sternum, ribs 1-6 —> humerus interrubercular groove
Flexion, adduction, medial rotation of humerus

Question 2

Posterior shoulder

Answer 2

Supraspinatus
Supraspinous fossa —> greater tub sup facet
Humerus abduction
N: c5-c6 --> suprascapular nerve
BV: Subclavian --> suprascapular artery

Test function vis the empty can/jobes test

Infraspinatus
Infraspinous foss —> greater tubercle middle facet
Humerus lateral rotation

Teres minor
Prox 2/3 lat border —> greater tuber inf facet
Humerus lateral rotation
N: C7--> AXILLARY n
BV: subscapular artery, post circumflex

Teres Major
INF border post scapula–> intertubercular groove of humerus
Adduction and med rotation of humerus

Question 3

Anterior upper arm

Answer 3

Long head biceps brachii
Supraglenoid tubercle —> radial tuberosity
Humerus flexion, forearm flexion, radioulnar supination
N: c5-c6–> Musculocutaneous N
BV: brachial artery

Short head biceps brachii
Coracoid — radius tuberosity
Humerus flexion, forearm flexion, radioulnar supination
N: C5-C6 --> musculocutaneous N
BV: brachial artery

Corachobrachialis
Coracoid process —> middle 1/3 humerus
Humerus flexion, adduction
N: C5-C6 --> musculocutaneous
BV: brachial artery--> muscular

Brachialis
Distal 1/2 humerus—> ulna coronoid tuberosity & tuberosity
Forearm flexion
N: c5-c6--> musculocutaneuous N
BV: brachial & radial reccurent

Question 4

Anterior superficial forearm

Answer 4

Flexors Nerve
Median

Flexor carpi ulnaris
2 heads: medial epicondyle of humerus & posterior olecranon process of ulna –> media carpals (pisiform, hamate hook) & bbase of metacarpal V
Flexes and adducts the hand and flexes the forearm.
N: C7- t1: ulnar nerve
BV: ulnar collateral arteries & ant and post ulnar recurrent art

Flexor carpi radialis
• Originates from the medial epicondyle of the humerus
• Inserts on the bases of metacarpals II and III
• Flexes and abducts the hand and flexes the forearm.
N: c6-c7–> median nerve
BV: recurrent ulnar artery, radial artery

Pronator teres
2 heads: • Humeral head originates on the medial epicondyle of the humerus;
• Ulnar head originates on the coronoid process of the ulna

• Pronator teres inserts mid-shaft of the lateral radius
• Pronates and flexes the forearm (no action on the wrist)

Palmaris longus
Originates on the medial epicondyle of humerus
• Inserts into the palmar aponeurosis

• Flexes the forearm and hand (variable).
• Lies superficially in the palm.

Brachioradialis
• Originates on the lateral supracondylar ridge of the humerus
• Inserts on the base of the styloid process of the radius
N: C7–> Radial N
BV: radial artery

Question 5

Anterior deep forearm

Answer 5

Pronator quadratus
Flexor digitorum profundus
Flexor pollicus longus
Flexor digitorum superficialis

Question 6

Posterior superficial forearm `

Answer 6

Extensor carpi radilais longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris

Question 7

Posterior deep forearm

Answer 7

Supinator
Abductor pollicus longus
Extensor pollicus brevis
Extensor pollicis longus
Extensor indicis