Muscles That Move the Pectoral Girdle and Upper Limb

The muscles of the ______________ _______________ originate on the lateral epicondyle of the humerus and produce EXTENSION of the wrist, hand and fingers

Posterior compartment

Intrinsic muscles of the hand

Small muscles that both originate and insert on the hand

These nine have their origins on the scapula

- Deltoid - Coracobrachialis - Terese Major - Triceps brachii - Biceps brachii - Rotator cuff muscles (4); Subscapularis; Supraspinatus; Infraspinatus; Teres minor

Hypothenar group muscles affect the motion of finger 5 and include the following:

- Flexor digiti minimi brevis - Abductor digiti minimi - Opponens digiti minimi

Thenar group muscles affect the motion of the thumb and include the following:

- Flexor pollicis brevis - Abductor pollicis brevis - Opponens pollicis

These two have their origins on the axial skeleton

- Latissimus dorsi - Pectoralis major

Organized into groups based on

- Location in the body - Part of skeleton they move

Midpalmar group of muscles affect the motion of all fingers and the thumb, and include the following:

- Lumbricals - Dorsal interossei - Palmer interossei - Adductor pollicis

These muscle function to stabilize the scapula during activities of upper limb

- Pectoralis minor - Serratus anterior - Subclavius - Trapezius - Levator scapulae - Rhomboid minor - Rhomboid major

The two muscles located on the anterior forearm that pronate the forearm are:

- Pronator teres - Pronator quadratus

Muscles of the posterior compartment of the forearm (10 muscles)

- Superficial layer - Deep layer

The muscle located on the posterior forearm that supinates the forearm is:

- Supinator

Intrinsic Muscles of Hand divided into 3 groups

- Thenar group - Hypothenar group - Midpalmar group

The posterior compartment of the arm and forearm muscles that move the elbow joint/forearm, contain extensors of the forearm, such as:

- Triceps brachii - Anconeus

Muscles of the anterior compartment of the forearm (9 muscles)

- superficial layer - intermediate layer - deep layer

Deep layer of posterior forearm

1) Abductor pollicis longus 2) Extensor pollicis brevis 3) Extensor pollicis longus 4) Extensor inidcis 5) Supinator

Superficial layer of posterior forearm

1) Extensor carpi radialis longus 2) Extensor carpi radialis brevis 3) Extensor digitorum 4) Extensor digit minimi 5) Extensor carpi ulnaris

Specific Groups:

1) Muscles that move the pectoral girdle 2) Muscles that move the glenohumeral (shoulder) joint/arm 3) Muscles of arm and forearm that move elbow joint/forearm 4) Muscles of forearm that move wrist joint, hand and fingers 5) Intrinsic muscles of hand

Superficial layer of anterior forearm

1) Pronator teres 2) Flexor carpi radialis 3) Palmaris longus 4) Flexor carpi ulnaris

_________ muscles insert on the humerus and cause movement of the arm

11

Intermediate layer of anterior forearm

5) Flexor digitorum superficialis

Deep layer of anterior forearm

6) Flexor pollicis longus 7) Flexor digitorum profundus 8) Prontaor quadratus

____________ muscles move upper and lower limbs and stabilize pectoral and pelvic girdles

Appendicular

The muscles of the _______________ ______________ originate on the medial epicondyle of the humerus and produce FLEXION of the wrist, hand and fingers

Anterior compartment

The space between the carpal bones and the flexor retinaculum is the

Capral tunnel

Muscles of the anterior compartment cross over the anterior surface of the carpal bones and are held in place by the

Flexor retinaculum

Extrinsic Muscles

Most muscles that move the wrist joint, hand and fingers originate on the forearm