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Ms of forearm & hand

Origin, Insertion, Action, Innervation of muscles of the forearm and hand

QuestionAnswer
Supinator Origin: lateral epicondyle of humerus, radial collateral ligament of elbow joint, anular ligament of proximal radioulnar joint, supinator fossa, crest of ulna
Supinator - Insertion proximal third of radius
Supinator - Action rotates radius to SUPINATE (flip palm up) forearm and hand. Occurs when forearm is flexed or extended.
Supinator - Innervation deep branch of radial nerve (C5, C6)
Pronator Teres - Origin humeral head: above medial epicondyle of humerus. Ulnar head: medial side of coronoid process of ulna
Pronator Teres - Insertion midway along lateral surface or radius
Pronator Teres - Action PRONATION - rotates radius on ulna, helps flex forearm at elbow
Pronator Teres - Innervation median nerve (C6, C7)
Pronator Quadrus - Origin Medial aspect of anterior surface of distal 1/4 of ulna
Pronator Quadrus - Insertion distal fourth of lateral border and anterior surface of shaft of radius
Pronator Quadrus - Action PRONATES the hand (assisted by pronator Teres when additional power is required).
Pronator Quadrus - Innervation Median Nerve (C8 and T1)
Flexor Carpi Radialis - Origin medial epicondyle of humerus and antebrachial fascia
Flexor Carpi Radialis - Insertion base of 2nd metacarpal bone, sends a slip to base os 3rd metacarpal bone
Flexor Carpi Radialis - Action flexes hand at wrist joint, aids in abduction
Flexor Carpi Radialis - Innervation median nerve (C6, C7)
Palmaris Longus - Origin medial epicondyle of humerus
Palmaris Longus - Insertion anterior aspect of flexor retinaculum, palmar aponeurosis
Palmaris Longus - Action flexes hand at wrist, tightens palmar aponeurosis
Palmaris Longus - Innervation median nerve (C6, C7)
Flexor Carpi Ulnaris - Origin humeral head: medial epicondyle of humerus. Ulnar head: olecranon process and posterior border of ulna.
Flexor Carpi Ulnaris - Insertion pisiform and hook of hamate
Flexor Carpi Ulnaris - Action flexes and adducts hand at wrist
Flexor Carpi Ulnaris - Innervation Ulnar Nerve (C7, C8)
Flexor Digitorum Superficialis - Origin humeroulnar head: medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna. Radial Head, duperior half of anterior radius
Flexor Digitorum Superficialis - Insertion four tendons of insertion attach to bodies of middle phalanges of medial 4 digits (index to little finger)
Flexor Digitorum Superficialis - Action flexes interphalangeal joints; also minorly flexes elbow, wrist, metacarpophalangeal joints.
Flexor Digitorum Superficialis - Innervation: median Nerve (C7, C8, T1)
Flexor Digitorum Profundus - Origin interosseous membrane, proximal 3/4 of medial ulna
Flexor Digitorum Profundus - Insertion four tendons attach to bases of distal phalanges of medial 4 digits (index to little finger)
Flexor Digitorum Profundus - Action flexes distal interphalangeal joints
Flexor Digitorum PRofundus - Innervation Proximal to the wrist this muscle divides into two parts: medial part - ulnar nerve (C8, T1). Lateral part: anterior interosseous branch of medial nerve (c8 and T1)
Flexor Pollicis Longus - Origin anterior aspect of radius, interosseous membrane
Flexor Pollicis Longus - Insertion base of distal phalanx of thumb
Flexor Pollicis Longus - Action flexion of distal phalanx of thumb, minorly flexes proximal phalanx of thumb
Flexor Pollicis Longus - Innervation Median Nerve (anterior interosseous branch) (C7, C8, T1)
Extensor Carpi Radialis Longus - Origin lateral supracondylar ridge of humerus
Extensor Carpi Radialis Longus - Insertion base of 2nd metacarpal
Extensor Carpi Radialis Longus - Action extends and abducts hand at wrist joint
Extensor Carpi Radialis Longus - Innervation Radial Nerve (C6, C7)
Extensor Carpi Radialis Brevis - Origin lateral epicondyle of humerus
Extensor Carpi Radialis Brevis - Insertion base of 3rd metacarpal
Extensor Carpi Radialis Brevis - Action extends and abducts hand at wrist joint
Extensor Carpi Radialis Brevis - Innervation radial nerve (deep branch) (C7, C8)
Extensor Carpi Ulnaris - Origin two heads: one head from lateral epicondyle of humerus, one head from posterior border of ulna
Extensor Carpi Ulnaris - Insertion base of 5th metacarpal
Extensor Carpi Ulnaris - Action extends and adducts hand at wrist joint
Extensor Carpi Ulnaris - innervation Radial nerve (Posterior interosseous branch) (C7, C8)
Extensor Digitorum - Origin lateral epicondyle of humerus
Extensor Digitorum - Insertion extensor expansions of medial 4 digits (index finger to little finger)
Extensor Digitorum - Action extension at metacarpalphalangeal and interphalangeal joints
Extensor Digitorum - Innervation radial nerve (posterior interosseous branch) (C7, C8)
Extensor Digiti Minimi - Origin Lateral epicondyle of humerus
Extensor Digiti Minimi - Insertion extensor expansion of 5th digit
Extensor Digiti Minimi - Action extends 5th digit
Extensor Digiti Minimi - Innervation radial nerve (posterior interosseous branch) (C7, C8)
Extensor Indices - Origin posterior surface of ulna and interosseous membrane
Extensor Indices - Insertion extensor expansion of 2nd digit
Extensor Indices - Action extends all joints of index finger
Extensor Indices - Innervation radial nerve (C7, C8)
Abductor Pollicis Longus - Origin posterior ulna, interosseous membrane
Abductor Pollicis Longus - Insertion base of 1st metacapal
Abductor Pollicis Longus - Action abducts, extends, laterally rotates thumb at carpometacarpal joint, may contribute to abduction of wrist.
Abductor Pollicis Longus - Innervation radial nerve (posterior interosseous branch) (C7, C8)
Extensor Pollicis Brevis - origin posterior surface of radius and interosseous membrane
Extensor Pollicis Brevis - Insertion base of proximal phalanx of thumb
Extensor Pollicis Brevis - Action extends proximal phalanx of thumb
Extensor Pollicis Brevis - innervation radial nerve (posterior interosseous branch) (C7 and C8)
Extensor Pollicis Longus - Origin Posteror surface of middle third of ulna and interosseous membrane
Extensor Pollicis Longus - Insertion base of proximal phalanx of thumb
Extensor Pollicis Longus - Action extends distal phalanx of thumb
Extensor Pollicis Longus - Innervation Radial nerve (Posterior interosseous branch) (C7, C8)
Adductor Pollicis - Origin bases of 2nd and 3rd metacarpals, capitate
Adductor Pollicis - Innervation radial nerve (posterior interosseous branch) (C7, C8)
Opponens Pollicis - Origin flexor retinaculum and trapezium
Opponens Pollicis - Insertion lateral side of 1st metacarpal
Opponens Pollicis - Action facilitates opposing grip (thumb opposed to fingers)
Opponens Pollicis - Innervation recurrent branch of median nerve (C8, T1)
ABductor Pollicis Brevis - Origin flexor retinaculum, tubercles of scaphoid, trapezium
ABductor Pollicis Brevis - Insertion lateral side of base of proximal phalanx of thumb
ABductor Pollicis Brevis - Action Abducts thumb
ABductor Pollicis Brevis - Innervation Recurrent branch of radial nerve
Flexor Pollicis Brevis - ORigin two heads: superficial head: flexor retinaculum, trapezium. deep head: floor of carpal canal (which overlies trapezium and capitate bones)
Flexor Pollicis Brevis - Insertion lateral sideof first metacarpal bone
Flexor Pollicis Brevis - Action flexes proximal phalanx of thumb
Flexor Pollicis Brevis - Innervation recurrent branch of median nerve (C8)
Lumbrical Muscles - Origin flexor digitorum profundus
Lumbrical Muscles - Insertion lateral sidesof extensor expansions of digits 2-5
Lumbrical Muscles - Action flex metacarpopharyngeal joints, extend interphalangeal joints
Lumbrical muscles - Innervation lumbricals 1&2: median nerve (C8, T1). Lumbricals 3&4: deep branch of ulnar nerve (C8, T1)
Opponens Digiti Minimi - Origin hook of hamate, flexor retinaculum
Opponens Digiti Minimi - Insertion palmar sufaceof body of 5th metacarpal
Opponens Digiti Minimi - Action ABducts, flexes, laterally rotates 5th metacarpal (increases power of grip, opposes little finger ot thumb)
Opponens Digiti Minimi - Innervation deep branch of ulnar nerve (C8, T1)
Flexor Digiti Minimi - Origin hook of hamate, flexor retinaculum
Flexor Digiti Minimi - Insertion base of proximal phalanx of 5th digit
Flexor Digiti Minimi - Action flexes proximal phalanx of 5th digit
Flexor Digiti Minimi - Innervation Deep branch of ulnar nerve (C8, T1)
ABductor Digiti Minimi - Origin pisiform and tendon of flexor carpi ulnaris muscle
ABductor Digiti Minimi - Insertion base of proximal phalanx of 5th digit
;ABductor Digiti Minimi - Action ABducts 5th digit
ABductor Digiti Minimi - Innervation Deep branch of ulnar nerve (C8, T1)
The Hypothenal Muscles Include... ABductor digiti minimi, Opponens digiti minimi, Flexor digiti minimi
Thenar Muscles Include... ABductor pollicis brevis, opponens pollicis, flexor pollicis breves
Created by: igelderloos
 

 



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