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Upper Muscle Anatomy

Upper Extremity Muscle Anatomy - Action, Origin, Insertion and Innervation

QuestionAnswer
Deltoid : Action [Flexion & Medial Rotation, Abduction, Extension and Lateral Rotation] Flex and medially rotate the arm, prime mover of arm abduction and extends and laterally rotates the arm.
Deltoid : Origin Acromial end of clavicle; acromion and spine of scapula.
Deltoid : Insertion Deltoid tuberosity of humerus
Deltoid : Innervation Axillary nerve (C5-C6)
Coracobrachialis : Action [Adduction & Flexion] Adducts and flexes arm
Coracobrachialis : Origin Coracoid process of scapula.
Coracobrachialis : Insertion Middle medial shaft of humerus.
Coracobrachialis : Innervation Musculocutaneous nerve (C5-C6)
Biceps brachii (long head) : Action Flexes arm
Biceps brachii (long head) : Origin Supraglenoid tubercle of scapula
Biceps brachii (long head) : Insertion Radial tuberosity and bicipital aponeurosis
Biceps brachii (long head) : Innervation Musculocutaneous nerve (C5-C6 fibers)
Triceps brachii (long head) : Action [Extension & Flexion] Primary extensor of forearm, also extends and adducts arm
Triceps brachii (long head) : Origin Infraglenoid tubercle of scapula
Triceps brachii (long head) : Insertion Olecranon process of ulna
Triceps brachii (long head) : Innervation Radial nerve (C5-C7 axons)
Biceps brachii (long head) : Action flexes arm
Biceps brachii (long head) : Origin Supraglenoid tubercle of scapula
Biceps brachii (long head) : Insertion Radial tuberosity and biciptial aponeurosis
Biceps brachii (short head) : Action Flexes forearm, powerful supinator of forearm
Biceps brachii (short head) : Origin coracoid process of scapula
Biceps brachii (short head) : Insertion Radial tuberosity and bicipital aponeurosis
Biceps brachii (short head) : Innervation Musculocutaneous nerve (C5 - C6 fibers)
Brachialis : Action Primary flexor of forearm
Brachialis : Origin Distal anterior surface of humerus
Brachialis : Insertion Tuberosity and coronoid process
Brachialis : Innervation Musculocutaneous nerve (C5-C6 fibers)
Brachioradialis : Action Flexes the forearm
Brachioradialis : Origin Lateral supracondylar ridge of the humerus
Brachioradialis : Insertion Styloid process of the radius
Brachioradialos: Innervation Radial nerve (C6-C7 fibers)
Triceps brachii (Lateral Head): Action Primary extensor of forearm
Triceps brachii (Lateral Head): Origin posterior humerus above radial groove
Triceps brachii (Lateral Head): Insertion olecrenon process of ulna
Triceps brachii (Lateral Head): Inervation Radial Nerve
Triceps brachii (Medial head): Action Primary extensor of forearm
Triceps brachii (Medial head): Origin Posterior humerus below radial groove
Triceps brachii (medial head): Innervation Radial Nerve
Anconeus: Action Extends the forearm
Anconeus: Origin Lateral epicondyle of humerus
Anconeus: Insertion Olecranon of ulna
Anconeus: Innervation Radial Nerve
Pronator teres: Action Pronates forearm
Pronator teres: Origin Medial epicondyle of humerus
Pronator teres: Insertion Lateral surface of radius
Pronator teres: Innervation Median nerve
Flexor carpi radialis: Action flexes wrist and abducts the hand
Flexor carpi radialis: Origin Medial epicondyle of humerus
Flexor carpi radialis: Insertion Base of metacarpals II and III
Flexor carpi radialis: Innervation Median Nerve
Flexor carpi ulnaris: Action Flexes wrist and adducts the hand
Flexor carpi ulnaris: Origin Medial epicondyle of humerus; olecranon and posterior surface of ulna
Flexor carpi ulnaris: Insertion Pisiform and hamate bones; base of metacarpal V
Flexor carpi ulnaris: Innervation Ulnar nerve
Palmaris longus: Action Weak wrist flexor
Palmaris longus: Origin Medial epicondyle of humerus
Palmaris longus: Insertion Flexor retinaculum and palmar aponeurosis
Palmaris longus: Innervation Median nerve
Flexor digitorum superficialis: Action Flexes wrist, 2nd-5th MP joints, and PIP joints
Flexor digitorum superficialis: Origin Medial epicondyle of humerus, coronoid process of ulna
Flexor digitorum superficialis: Insertion Middle phalanges of fingers 2-5
Flexor digitorum superficilaris: Innervation Median nerve
Flexor digitorum profundus: Action Flexes wrist, 2nd-5th MP joints, PIP joints and DIP joints
Flexor digitorum profundus: Origin Anteromedial surface of ulna; interosseous membrane
Flexor digitorum profundus: Insertion Distal phalanges of fingers 2-5
Flexor digitorum profundus: Innervation Lateral 1/2 of muscle innervated by median nerve, medial 1/2 of muscle innervated by ulnar nerve
Extensor carpi radialis longus: Action Extends the wrist, abducts the hand
Extensor carpi radialis longus: Origin Lateral supracondylar ridge of humerus
Extensor carpi radialis longus: Insertion Base of metacarpal II
Extensor carpi radialis longus: Innervation Radial Nerve
Extensor carpi radialis brevis: Action Extends the wrist, abducts the hand
Extensor carpi radialis brevis: Origin Lateral epicondyle of humerus
Extensor carpi radialis brevis: Insertion Base of metacarpal III
Extensor carpi radialis brevis: Innervation Radial nerve
Extensor digitorum: Action Extends the wrist, extends 2nd-5th MP joints, PIP joints, and DIP joints
Extensor digitorum: Origin Lateral epicondyle of humerus
Extensor digitorum: Insertion Distal and middle phalanges of fingers 2-5
Extensor digitorum: Innervation Radial Nerve
Extensor digiti minimi: Action Extends wrist, MP, and PIP joints of finger 5
Extensor digiti minimi: Origin Lateral epicondyle of humerus
Extensor digiti minimi: Insertion Proximal phalanx of finger 5.
Extensor digiti minimi: Innervation Radial Nerve
Abductor pollicis longus: Action Abducts thumb, extends wrist (weakly)
Abductor pollicis longus: Origin Proximal dorsal surfaces of radius and ulna; interosseous membrane
Abductor pollicis longus: Insertion Lateral edge of metacarpal I
Abductor pollicis longus: Innervation Radial nerve
Extensor pollicis brevis: Action Extends MP joints of thumb, extends wrist (weakly)
Extensor pollicis brevis: Origin Posterior surface of radius; interosseous membrane
Extensor pollicis brevis: Insertion Proximal phalanx of thumb
Extensor pollicis brevis: Innervation Radial nerve
Extensor pollicis longus: Action Extends MP and IP joints of thumb, extends wrist (weakly)
Extensor pollicis longus: Origin Posterior surface of ulna; interosseous membrane
Extensor pollicis longus: Insertion Distal phalanx of thumb
Extensor pollicis longus: Innervation Radial nerve
Created by: biochick
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