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Muscles of the forearm
The document describes the muscles of the anterior, lateral, and posterior fascial compartments of the forearm. In the anterior compartment, there are superficial, intermediate, and deep groups of muscles including the flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and flexor digitorum profundus. The muscles are supplied by the median and ulnar nerves except for the flexor carpi ulnaris. The lateral compartment includes the brachioradialis and extensors of the wrist and fingers. The posterior compartment comprises extensors of the wrist, fingers and thumb including the abductor pollicis longus, extensor pollicis brevis and extensor
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Muscles of the forearm
- 1. The forearm Prepared By: Dr. Mohaned Abu lehea
- 2. Contents of theAnterior Fascial Compartment of the Forearm • Muscles: • A superficial group : consisting of the pronator teres, the flexor carpi radialis, the palmaris longus, and the flexor carpi ulnaris. • An intermediate group : consisting of the flexor digitorum superficialis; and a • Deep group : consisting of the flexor pollicis longus, the flexor digitorum profundus, and the pronator quadratus
- 3. • Blood supplyto the muscles: Ulnar and radial arteries • Nerve supply to the muscles: • All the muscles are supplied by the median nerve and its branches, except the flexor carpi ulnaris and the medial part of the flexor digitorum profundus, which are supplied by the ulnar nerve
- 4. Muscles of theAnterior Fascial Compartment of the Forearm
- 5.
- 7. Pronator Teres • Origin •Humeral head : Medial epicondyle of humerus • Ulnar head : Medial border of coronoid process of ulna • Action • Lateral aspect of shaft of radius
- 8. • Nerve supply: Median nerve • Action : Pronation and flexion of forearm
- 9.
- 11. Flexor carpi radialis •Origin • Medial epicondyle of humerus • Insertion • Bases of second and third metacarpal bones
- 12. • Nerve supply •Median nerve • Action • Flexes and abducts hand at wrist joint
- 14.
- 15. Flexor Carpi Ulnaris •Origin • Humeral head : Medial epicondyle of humerus • Ulnar head : Medial aspect of olecranon process and posterior border of ulna • Insertion • Pisiform bone, hook of the hamate, base at fifth metacarpal bone
- 16. • Nerve supply •Ulnar nerve • Action • Flexes and adducts hand at wrist joint
- 17.
- 18.
- 19. Palmaris longus • Origin •Medial epicondyle of humerus • Insertion • Flexor retinaculum and palmar aponeurosis
- 20. • Nerve supply •Median nerve • Action • Flexes hand
- 21.
- 23. Flexor Digitorum Superficialis •Origin • Humeroulnar head : Medial epicondyle of humerus; medial border of coronoid process of ulna • Radial head : Oblique line on anterior surface of shaft of radius • Insertion • Middle phalanx of medial four fingers
- 24. • Nerve supply •Median nerve • Action • Flexes middle phalanx of fingers and assists in flexing proximal phalanx and hand
- 25.
- 27. Flexor pollicis longus •Origin • Anterior surface of shaft of radius • Insertion • Distal phalanx of thumb
- 28. • Action • Flexesdistal phalanx of thumb • Nerve supply • Anterior interosseous branch of median nerve
- 29.
- 31. Flexor digitorum profundus •Origen • Anteromedial surface of shaft of ulna • Insertion • Distal phalanges of medial four fingers
- 32. • Action • Flexesdistal phalanx of fingers; then assists in flexion of middle and proximal phalanges and wrist • Nerve supply • Ulnar (medial half) and median (lateral half) nerves
- 33.
- 35. Pronator quadratus • Origin •Anterior surface of shaft of ulna • Insertion • Anterior surface of shaft of radius
- 36. • Action • Pronatesforearm • Nerve Supply • Anterior interosseous branch of median nerve
- 37. Muscles of theLateral Fascial Compartment of the Forearm
- 38.
- 40. Brachioradialis • Origin • Lateralsupracondylar ridge of humerus • Insertion • Base of styloid process of radius
- 41. • Action • Flexesforearm atridge of humerus elbow joint rotates forearm to the midprone position • Nerve supply • Radial nerve
- 42. Extensor carpi radialislongus
- 44. Extensor carpi radialislongus • Origin • Lateral supracondylar ridge of humerus • Insertion • Posterior surface of base of second metacarpal bone
- 45. • Action • Extendsand abducts hand at wrist joint • Nerve supply • Radial nerve
- 46. Muscles of thePosterior Fascial Compartment of the Forearm
- 47. Extensor carpi radialisbrevis
- 49. Extensor carpi radialisbrevis • Origin • Lateral epicondyle of humerus • Insertion • Posterior surface of base of third metacarpal bone
- 50. • Action • Extendsand abducts hand at wrist joint • Nerve supply • Deep branch of radial nerve
- 51.
- 53. Extensor digitorum • Origin •Lateral epicondyle of humerus • Insertion • Middle and distal phalanges of medial four fingers
- 54. • Action • Extendsfingers and hand • Nerve supply • Deep branch of radial nerve
- 55.
- 57. Extensor digiti minimi •Origin • Lateral epicondyle of humerus • Insertion • Extensor expansion of little finger
- 58. • Action • Extendsmetacarpal phalangeal joint of little finger • Nerve supply • Deep branch of radial nerve
- 59.
- 61. Extensor carpi ulnaris •Origin • Lateral epicondyle of humerus • Insertion • Base of fifth metacarpal bone
- 62. • Action • Extendsand adducts hand at wrist joint • Nerve supply • Deep branch of radial nerve
- 63.
- 65. Anconeus • Origin • Lateralepicondyle of humerus • Insertion • Lateral surface of olecranon process of ulna
- 66. • Action • Extendselbow joint • Nerve supply • Radial nerve
- 67.
- 69. Supinator • Origin • Lateralepicondyle of humerus, anular ligament of proximal radioulnar joint, and ulna • Insertion • Neck and shaft of radius
- 70. • Action • Supinationof forearm • Nerve supply • Deep branch of radial nerve
- 71.
- 73. Abductor pollicis longus •Origin • Posterior surface of shafts of radius and ulna • Insertion • Base of first metacarpal bone
- 74. • Action • Abductsand extends thumb • Nerve supply • Deep branch of radial nerve
- 75.
- 77. Extensor pollicis brevis •Origin • Posterior surface of shaft of radius • Insertion • Base of proximal phalanx of thumb
- 78. • Action • Extendsmetacarpophalangeal joints of thumb • Nerve supply • Deep branch of radial nerve
- 79.
- 81. Extensor pollicis longus •Origin • Posterior surface of shaft of ulna • Insertion • Base of distal phalanx of thumb
- 82. • Action • Extendsdistal phalanx of thumb • Nerve supply • Deep branch of radial nerve
- 83.
- 85. Extensor indicis • Origin •Posterior surface of shaft of ulna • Insertion • Extensor expansion of index finger
- 86. • Action • Extendsmetacarpophalangeal joint of index finger • Nerve Supply • Deep branch of radial nerve
- 87.