Lab Muscles Part 3. Upper Limb and Shoulder

What are the muscles that cross the shoulder joint?

• Pectoralis Major

• Deltoid

• Latissimus dorsi

• Subscapularis

• Supra spinatus

• Infraspinatus

• Teres minor

• Teres major

What is the origin, insertion, and action of Pectoralis Major ?

Origin- 1st rib, clavicle, sternum,

Insertion- Humorous, greater tubercle

Action- prime mover-= arm flexion, adducts, medially rotates arm

What is the origin, insertion, and action of Deltoid ?

Origin- Clavicle, acromion and spine of Scapula/Scapula (acromion and spine)

Insertion- Deltoid tuberosity of humerous/Humerous (Deltoid Tuberosity)

Action- PM= Abduction of arm, flexor, extensor of arm

What is the origin, insertion, and action of Latissimus Dorsi ?

Origin- T7-T12, all lumbar spinous processes, ribs 10-12

Insertion- Humerous: Intertubercular Groove

Action- Prime mover Extends arm, adducts, medially rotates arm

What is the origin, insertion, and action of Subscapularis ?

Origin- Subscapular fossa

Insertion- Lesser tubercle of Humerous

Action- Humerous: medial rotator; holds humerous in glenoid cavity (rotator cuff)

What is the origin, insertion, and action of Supraspinatous ?

Origin- Supraspinous fossa of scapula

Insertion- greater tubercle of humerous (superior face)

Action- Abduction of humerous, holds humerous head (rotator cuff)

What is the origin, insertion, and action of Infraspinatus ?

Origin- infraspinous fossa of scapula

Insertion- greater tubercle of humerous

Action- lateral rotation of humerous,. Holds humerous head (rotator cuff)

What is the origin, insertion, and action of Teres Minor ?

Origin- Lateral margin of scapula

Insertion- Greater tubercle of humerous (posterior

Action- Lateral rotation of humerous. Holds humerous head (rotator cuff)

What is the origin, insertion, and action of Teres Major ?

Origin- Posterior surface of scapula (inferior)

Insertion- lesser tubercle of humerous (medial lip, intertubuclear sulcus)

Action- Extends, medially rotates, and adducts humerous (synergy latissimus

What are muscles that cross the elbow joint?

• Triceps brachii

• Biceps brachii

• Brachialis

• Brachioradialis

What is the origin, insertion, and action of Triceps Brachii ?

Origin- Long head: infraglenoid tubercle of scapula, Lateral head: posterior humerous, Medial head: below the radial groove on humerous

Insertion- olecranon process of ulna

Action- Prime Mover Extends Forearm, extends arm

What is the origin, insertion, and action of Biceps Brachii ?

Origin- Short head: coracoid process of scapula, Long head;: supraglenoid tubercle of scapula, tendon in interbutercular sulcus, intracapsular

Insertion- Radial tuberosity

Action- Flexes/supinates forearm. Weak flexor arm

What is the origin, insertion, and action of Brachialis?

Origin- distal humerous (deep to biceps)

Insertion- coronoid process of ulna

Action- Flexes forearm. PRIME MOVER

What is the origin, insertion, and action of Brachioradialis ?

Origin- distal humerous

Insertion- radial styloid process of radius

Action- Flexes forearm

What are muscles of the Forearm: movements of writs, hands, and fingers. Anterior.

• Pronator teres

• Flexor carpi radialis

• Palmaris longus

• Flexor carpi ulnaris

• Flexor digitorum superficialis

• Flexor policis longus

• Flexor Digitorum profundus

• Pronator quadratus

What is the origin, insertion, and action of Pronator teres ?

Origin- medial epicondyle of humerous, coronoid process of ulna

Insertion- radial diaphysis

Action- forearm pronation (with pronator quadratus)

What is the origin, insertion, and action of Flexor carpi radialis?

Origin- medial epicondyle of humerous

Insertion- base metacarpals 2, 3

Action- flexor, abductor of hand

What is the origin, insertion, and action of Palmaris longus?

Origin- medial epicondyle of humerous

Insertion- palmar aponeurosis, skin of palm

Action- tenses skin and fascia of palm

What is the origin, insertion, and action of Flexor carpi ulnaris?

Origin- medial epicondyle of humerous, posterior ulna

Insertion- pisiform, hamate, base metacarpal V

Action- flexes adducts hand

What is the origin, insertion, and action of Flexor digitorum superficialis?

Origin- medial epicondyle of humerous, coronoid process of ulna, shaft of radius

Insertion- middle phalanges digits II-V

Action- flexes hand and fingers II-V

What is the origin, insertion, and action of Flexor policis longus?

Origin- anterior surface of radius

Insertion- distal thumb phalanx

Action- flexes thumb

What is the origin, insertion, and action of Flexor digitorum profundus?

Origin- anterior ulna, coronoid process of ulna

Insertion- distal phalanges digits II-V

Action- ONLY muscle for flexing distal phalanges digits

What is the origin, insertion, and action of pronator quadratus?

Origin- distal portion of anterior ulna

Insertion- distal surface of anterior radius

Action- Pronates forearm, prime mover

What are muscles of the Forearm: movements of writs, hands, and fingers. Posterior.

• Brachioradialis

• Extensor carpi radialis longus

• Extensor carpi radialialis brevis

• Extensor digitorum

• Extensor carpi ulnaris

What is the origin, insertion, and action of brachioradials?

Origin- distal humerous

Insertion- styloid process of radius

Action- flexes forearm

What is the origin, insertion, and action of extensor carpi radialis longus?

Origin-lateral epiphysis of humerous/humerous lateral epiphysis

Insertion- base metacarpal II

Action- extends/ abducts hand

What is the origin, insertion, and action of extensor carpi radialis brevis?

Origin- lateral epicondyle of humerous

Insertion- base metacarpal III

Action-extends/abducts hand

What is the origin, insertion, and action of extensor digitorum?

Origin- lateral epicondyle of humerous

Insertion- distal phalanges digits II-V

Action- PRIME MOVER extensor of digits

What is the origin, insertion, and action of extensor carpi ulnaris?

Origin- lateral epicondyle of humerous

Insertion- basemetacarpal V

Action- extends/abducts hand