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The Muscular System Muscle of the Arm and Forearm dorsal/posterior

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Page 1: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

The Muscular SystemMuscle of the Arm and Forearm dorsal/posterior

Page 2: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Muscles of the Upper Limb

3 groups

1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the humerus

2. Muscles that cause movement at the elbow which insert on the forearm bones

3. Muscles of the forearm which insert on the hand bones

Page 3: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

General Organization

Upper Limb Extensors on the posterior/dorsal

surface

Page 4: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Muscles that act on the wrist

Generally originate on the distal humerus Extensors on the lateral epicondyle

Insert on the carpals and metacarpals

Page 5: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Muscles that act on the fingers

Generally originate on the distal humerus Extensors on the lateral epicondyle

Insert on the phalanges

Page 6: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Clavobrachialis (Clavodeltoid):

Deltoid muscle in humansAction:

Abducts the shoulderOrigin:

Clavicle and scapula Insertion:

Deltoid tuberosity of humerus

Page 7: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Triceps brachii

Action: antagonist of biceps Extension (shoulder and elbow)

Origin: three heads Shoulder girdle and proximal humerus

Insertion: Olecranon process of ulna

Page 8: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Brachioradialis:

Action: Flexion at the elbow

Origin: lateral epicondyle of the humerus

Insertion: Styloid process of the radius

Page 9: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Extensor carpi radialis

Action: Extension/abduction

(wrist)Origin:

Lateral epicondyle Insertion:

Second and third metacarpals

Page 10: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Extensor digitorum

Action: Extension (fingers

and wrist)Origin:

Lateral epicondyle Insertion:

Posterior surfaces of phalanges

Page 11: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Extensor carpi ulnaris

Action: Extension/

adduction (wrist)Origin:

Lateral epicondyle Insertion:

Base of 5th metacarpal

Page 12: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Dorsal Surface

clavobrachialis

Triceps brachii

brachioradialis

Extensor carpi radialis

Extensor digitorum

Extensor carpi ulnaris

Page 13: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Posterior/dorsalTriceps brachii

brachioradialis

Page 14: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Posterior/dorsalTriceps brachii

brachioradialis

Flexor carpi

ulnaris

Extensor carpi radialis

Extensor carpi ulnaris

Page 15: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

Posterior/dorsalTriceps brachii

brachioradialis

Flexor carpi

ulnaris

Extensor carpi radialis

Extensor carpi ulnaris

Extensor digitorum

Page 16: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the
Page 17: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the
Page 18: Muscle of the Arm and Forearm dorsal/posterior. 3 groups 1. Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the

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