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Muscles of the Forearm and Hand
To learn the origin, insertion, action and nerve innervation for the muscles of the forearm and hand plus some very important ligaments.
96
Anatomy
Not Applicable
02/19/2026

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Term
What is the origin of the brachialis?
Definition
Distal half of anterior surface of humerus.
Term
What is the insertion of the brachialis?
Definition
Tuberosity and coronoid process of ulna
Term
What is the nerve innervation of the brachialis?
Definition
Musculocutaneous, small branch from radial C5-C6
Term
What is the origin of the brachioradialis?
Definition
Proximal 2/3 of the lateral supracondylar ridge of humerus
Term
What is the insertion of the brachioradialis?
Definition
Styloid process of radius
Term
What is the nerve innervation of the brachioradialis?
Definition
Radial C5-C6
Term
What is the origin of the extensor carpi radialis longus?
Definition
Distal 1/3 of the lateral supracondylar ridge of humerus.
Term
What is the insertion of the extensor carpi radialis longus?
Definition
Base of second metacarpal.
Term
What is the nerve innervation for the extensor carpi radialis longus?
Definition
Radial C5-C8
Term
What is the origin of the extensor carpi brevis?
Definition
Common extensor tendon from the lateral epicondyle of humerus
Term
What is the insertion of the extensor carpi radialis brevis?
Definition
Base of third metacarpal
Term
What is the nerve innervation of the extensor carpi radialis brevis?
Definition
Radial C6-C8
Term
What is the origin of the extensor carpi ulnaris?
Definition
Common extensor tendon from the lateral epicondyle of humerus.
Term
What is the insertion of the extensor carpi ulnaris?
Definition
Base of fifth metacarpal.
Term
What is the nerve innervation for the extensor carpi ulnaris?
Definition
Radial C6-C8
Term
What is the origin for the extensor digitorium?
Definition
Common extensor tendon from the lateral epicondyle of humerus.
Term
What is the insertion of the extensor digitorium?
Definition
Bases of middle and distal phalanges of 2nd-5th fingers.
Term
What is the nerve innervation of the extensor digitorium?
Definition
Radial C6-C8
Term
What is the origin of the aconeus?
Definition
Lateral epicondyle of the humerus.
Term
What is the insertion of the aconeus?
Definition
Olecranon process and posterior, proximal surface of ulna.
Term
What is the nerve innervation of aconeus?
Definition
Radial C7-C8.
Term
What is the origin of the extensor indicis?
Definition
Posterior surface of distal shaft of ulna and interosseous membrane.
Term
What is the insertion of the extensor indicis?
Definition
Tendon of the extensor digitorum at the level of the 2nd metacarpal.
Term
What is the nerve innervation for the extensor indicis?
Definition
Radial C6-C8.
Term
What is the origin of the flexor carpi radialis?
Definition
Common flexor tendon from medial epicondyle of humerus.
Term
What is the insertion of the flexor carpi radialis?
Definition
Bases of 2nd and 3rd metacarpals
Term
What is the nerve innervation of the flexor carpi radialis?
Definition
Median C6-C8
Term
What is the origin of the palmaris longus?
Definition
Common flexor tendon from medial epicondyle of humerus.
Term
What is the insertion of the palmaris longus?
Definition
Flexor retinaculum
Palmar aponeurosis
Term
What is the nerve innervation for the palmaris longus?
Definition
Median nerve
C6-T1
Term
What is the origin of the flexor carpi ulnaris?
Definition
Humeral Head: Common flexor tenon from medial epicondyle of humerus.
Ulnar head: Posterior surface of proximal two thirds of ulna.
Term
What is the insertion of the flexor carpi ulnaris?
Definition
Pisiform
Hook of the hamate
Base of 5th metacarpal
Term
What is the nerve innervation of the flexor carpi ulnaris?
Definition
Ulnar C7-T1
Term
What is the origin of the flexor digitorum superficialis?
Definition
Common flexor tendon from the medial epicondyle of the humerus.
Ulnar collateral ligament.
Coronoid process of the ulna.
Interosseous membrane.
Proximal shaft of radius.
Term
What is the insertion of the flexor digitorum superficialis?
Definition
Sides of middle phalanges of 2nd-5th fingers.
Term
What is the nerve innervation of the flexor digitorum superficialis?
Definition
Median nerve
C7-T1
Term
What is the origin of the flexor digitorum profundus?
Definition
Anterior and medial surfaces of proximal 3/4 of ulna.
Term
What is the insertion of the flexor digitorum profundus?
Definition
Bases of distal phalanges
Palmar surface of 2nd-5th fingers.
Term
What is the nerve innervation of the flexor digitorum profundus?
Definition
2nd and 3rd fingers: Median nerve, C7-T1.
4th and 5th fingers: Ulnar nerve, C7-T1.
Term
What is the origin of the pronator teres?
Definition
Common flexor tendon from median epicondyle of humerus.
Coronoid process of ulna.
Term
What is the insertion of the pronator teres?
Definition
Middle of lateral surface of the radius.
Term
What is the nerve innervation of the pronator teres?
Definition
Median nerve
C6-C7
Term
What is the origin of the pronator quadratus?
Definition
Medial, anterior surface of distal ulna.
Term
What is the insertion of the pronator quadratus?
Definition
Lateral, anterior surface of distal radius
Term
What is the nerve innervation for the pronator quadratus?
Definition
Median nerve
C7-T1
Term
What is the origin of the supinator?
Definition
Lateral epicondyle of humerus.
Radial collateral ligament.
Annular ligament.
Supinator crest of ulna.
Term
What is the insertion of the supinator?
Definition
Anterior, lateral surface of proximal 1/3 of radial shaft
Term
What is the nerve innervation of the supinator?
Definition
Radial nerve
C5-C7
Term
What is the origin of the abductor pollicis longus?
Definition
Posterior surface of radius and ulna.
Interosseous membrane.
Term
What is the insertion of the abductor pollicis longus?
Definition
Base of first metacarpal.
Term
What is the nerve innervation for the abductor pollicis longus?
Definition
Radial nerve
C6-C7
Term
What is the origin of the extensor pollicis longus?
Definition
Posterior surface of ulna and interosseous membrane.
Term
What is the insertion of the extensor pollicis longus?
Definition
Base of distal phalanx of thumb.
Term
What is the origin of the extensor pollicis brevis?
Definition
Posterior surface of radius and interosseous membrane.
Term
What is the insertion of the extensor pollicis brevis?
Definition
Base of proximal phalanx of thumb.
Term
What is the nerve innervation of the extensor pollicis longus and brevis?
Definition
Radial nerve
C6-C7
Term
What is the origin of the flexor pollicis longus?
Definition
Anterior surface of radius and interosseous membrane.
Term
What is the insertion of the flexor pollicis longus?
Definition
Base of distal phalanx of thumb.
Term
What is the nerve innervation of the flexor pollicis longus?
Definition
Median nerve
C6-T1
Term
What is the origin of the abductor pollicis brevis?
Definition
Flexor retinaculum
Trapezium and Scaphoid tubercles.
Term
What is the insertion of the abductor pollicis brevis?
Definition
Base of proximal phalanx of thumb.
Term
What is the nerve innervation of the abductor pollicis brevis?
Definition
Median nerve
C6-T1
Term
What is the origin of the flexor pollicis brevis?
Definition
Superficial head: Flexor retinaculum
Deep head: Trapezium, Trapezoid and capitate
Term
What is the insertion of the flexor pollicis brevis?
Definition
Base of proximal phalanx of thumb
Term
What is the nerve innervation for flexor pollicis brevis?
Definition
Superficial head: Median nerve, C6-T1
Deep head: Ulnar nerve, C8-T1
Term
What is the origin of the opponens pollicis?
Definition
Flexor retinaculum and tubercle of the trapezium.
Term
What is the insertion of the opponens pollicis?
Definition
Entire length of first metacarpal bone
Radial surface.
Term
What is the nerve innervation for the opponens pollicis?
Definition
Median nerve
C6,7,8,T1
Term
What is the origin of the adductor pollicis?
Definition
Capitate
2nd and 3rd metacarpals
Term
What is the insertion of the adductor pollicis?
Definition
Base of proximal phalanx of thumb.
Term
What is the nerve innervation of the adductor pollicis?
Definition
Ulnar nerve C8, T1
Term
What is the origin of the lumbricals?
Definition
Surfaces of the flexor digitorum profundus tendons.
Term
What is the insertion of the lumbricals?
Definition
Exterior aponeurosis on dorsal surface of phalanges
Term
What is the nerve innervation of the lumbricals?
Definition
2nd and 3rd fingers: Median C(6),7,8,T1.
4th and 5th fingers: Ulna C(7),8,T1.
Term
What is the origin of palmar interossei?
Definition
Base of 1st, 2nd, 4th, and 5th metacarpals.
Term
What is the insertion of the palmar interossei?
Definition
Base of the proximal phalanx of the related finger and the extensor aponeurosis.
Term
What is the nerve innervation for palmar interossi?
Definition
Ulnar C8,T1
Term
What is the origin of the dorsal interossei?
Definition
Adjacent sides of all metacarpals.
Term
What is the insertion for the dorsal interossei?
Definition
Base of the proximal phalanx of the 2nd, 3rd, and 4th fingers and the extensor aponeurosis.
Term
What is the nerve innervation for dorsal interossei?
Definition
Ulnar C8, T1
Term
What is the origin of the abductor digiti minimi?
Definition
Pisiform and tendon of flexor carpi ulnaris
Term
What is the insertion of the abductor digiti minimi?
Definition
Base of proximal phalanx of 5th finger.
Ulnar surface.
Term
What is the nerve innervation for the abductor digiti minimi?
Definition
Ulnar C(7),8,T1
Term
What is the origin for the flexor digiti minimi brevis?
Definition
Hook of hamate and flexor retinaculum
Term
What is the insertion of the flexor digiti minimi brevis?
Definition
Base of proximal phalanx of 5th finger. Palmar surface
Term
What is the nerve innervation for the flexor digiti minimi brevis?
Definition
Ulnar C(7),8,T1
Term
What is the origin of the opponens digiti minimi?
Definition
Hook of hamate and flexor retinaculum.
Term
What is the insertion of the opponens digiti minimi?
Definition
Shaft of 5th metacarpal, ulnar surface
Term
What is the nerve innervation of the opponens digiti minimi?
Definition
Ulnar C(7),8,T1
Term
The _______ is a cordlike band that stretches from the lateral epicondyle of the humerus to the annular ligament and lateral side of the ulna
Definition
Radial Collateral Ligament
Term
The _______ wraps around the head and neck of the radius, stabilizing the proximal radius against the ulna during pronation and supination?
Definition
Annular Ligament
Term
The ________ originates on the humerus's medial epicondyle and attaches to the coronoid process of the ulna and to the olecranon process.
Definition
Ulnar Collateral Ligament
Term
What muscles are primarily responsible for flexion at the elbow?
Definition
Biceps brachii
Brachialis
Brachioradialis
Term
What muscles are primarily responsible for extension at the elbow?
Definition
Triceps
Anconeus
Term
What muscles in the forearm are responsible for supination?
Definition
Biceps brachii
Supinator
Brachioradialis
Term
What muscles in the forearm are responsible for pronation?
Definition
Pronator teres
Pronator quadratus
Brachioradialis
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