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Forearm
Upper limb, forearm pronated. The forearm is the part of the upper limb between the elbow and the wrist.
Latin	antebrachium
MeSH	Forearm
Dorlands/Elsevier	a_45/12138967

The forearm is the structure on the upper limb, between the elbow and the wrist.^[1]. This term is used in anatomy to distinguish it from the arm (or upper arm).

Contents 1 The human forearm 2 Anatomy 2.1 Bones 2.2 Joints 2.3 Muscles 2.4 Nerves 2.5 Vessels 2.6 Other structures 3 Additional images 4 References 5 External links

The forearm contains two long bones, the radius and the ulna, forming the radioulnar joint. The interosseous membrane connects these bones. Ultimately, the forearm is covered by skin, the anterior surface usually being less hairy than the posterior surface.

The forearm contains many muscles, including the flexors and extensors of the digits, a flexor of the elbow (brachioradialis), and pronators and supinators that turn the hand to face down or upwards, respectively. In cross-section the forearm can be divided into two fascial compartments. The posterior compartment contains the extensors of the hands, which are supplied by the radial nerve. The anterior compartment contains the flexors, and is mainly supplied by the median nerve. The ulnar nerve also runs the length of the forearm.

The radial and ulnar arteries, and their branches, supply the blood to the forearm. These usually run on the anterior face of the radius and ulna down the whole forearm. The main superficial veins of the forearm are the cephalic, median antebrachial and the basilic vein. These veins can be used for cannularisation or venipuncture, although the cubital fossa is a preferred site for getting blood.

• radius
• ulna

• proximal to forearm
  • elbow
• in the forearm
  • proximal radioulnar joint
  • distal radioulnar joint
• distal to forearm
  • wrist

See also: Muscle table#ARM

Compartment	Level	Muscle	E/I	Nerve
Anterior	superficial	flexor carpi radialis	E	median
Anterior	superficial	palmaris longus	E	median
Anterior	superficial	flexor carpi ulnaris	E	ulnar
Anterior	superficial	pronator teres	I	median
Anterior	superficial (or intermediate)	flexor digitorum superficialis (sublimis)	E	median
Anterior	deep	flexor digitorum profundus	E	ulnar + median
Anterior	deep	flexor pollicis longus	E	median
Anterior	deep	pronator quadratus	I	median
Posterior	(see below)	brachioradialis	I	radial
Posterior	superficial	extensor carpi radialis longus	E	radial
Posterior	superficial	extensor carpi radialis brevis	E	radial
Posterior	intermediate	extensor digitorum (communis)	E	radial
Posterior	intermediate	extensor digiti minimi (proprius)	E	radial
Posterior	superficial	extensor carpi ulnaris	E	radial
Posterior	deep	abductor pollicis longus	E	radial
Posterior	deep	extensor pollicis brevis	E	radial
Posterior	deep	extensor pollicis longus	E	radial
Posterior	deep	extensor indicis (proprius)	E	radial
Posterior	deep	supinator	I	radial
Posterior	deep	anconeus	I	radial

• "E/I" refers to "extrinsic" or "intrinsic". In most cases, the extrinsic anterior muscles are flexors of the hand and wrist. The extrinsic muscles of the forearm act upon the hand and wrist. In most cases, the extrinsic anterior muscles are flexors, while the extrinsic posterior muscles are extensors.

• The Brachioradialis, flexor of the forearm, is unusual in that it is located in the posterior compartment, but it is actually in the anterior portion of the forearm.

(See separate nerve articles for details on divisions proximal to the elbow and distal to the wrist; see Brachial plexus for the origins of the median, radial and ulnar nerves)

• Median nerve - principle nerve of the anterior compartment (PT, FCR, PL, FDS).
  • anterior interosseous nerve (supplies FPL, lat. 1/2 of FDP, PQ).
• Radial nerve - supplies muscles of the posterior compartment (ECRL, ECRB).
  • Superficial branch of radial nerve
  • Deep branch of radial nerve, becomes Posterior interosseus nerve and supplies muscles of the posterior compartment (ED, EDM, ECU, APL, EPB, EPL, EI).
• Ulnar nerve - supplies some medial muscles (FCU, med. 1/2 of FDP).

Main article: Arterial tree of subclavian artery

• brachial artery
  • radial artery
    • radial recurrent artery
  • ulnar artery
    • pulminary archery
    • anterior ulnar recurrent artery and posterior ulnar recurrent artery
    • common interosseous artery
      • posterior interosseous artery
      • anterior interosseous artery

• interosseous membrane of the forearm
• annular ligament of ulna

Superficial muscles of the forearm

Deep muscles of the forearm

Cross-section through the middle of the forearm.

1. ^ Forearm at eMedicine Dictionary

• Forearm fractures

v • d • e Human anatomical features
Head	Skull · Forehead · Eye · Ear · Nose · Mouth · Tongue · Teeth · Jaw · Face · Cheek · Chin
Neck	Throat · Adam's apple
Torso	Shoulders · Spine · Breast (Tail of Spence) · Chest · Ribcage · Abdomen · Navel Sex organs (Clitoris · Vagina · Penis · Scrotum · Testicle) – Hip · Anus · Buttocks
Limbs	Arm · Elbow · Forearm · Wrist · Hand · Finger (Thumb · Index · Middle · Ring · Little) · Leg · Lap · Thigh · Knee · Calf · Heel · Ankle · Foot · Toe (Hallux)
Skin	Hair

v • d • e General anatomy of upper limbs
Arm	Clavipectoral triangle • spaces (Quadrangular space, Triangular space, Triangular interval) • Axilla • Axillary sheath • Anterior axillary fold • compartment of arm (Posterior, Anterior) • intermuscular septa (Lateral, Medial) • fascia (Axillary, Brachial)
Forearm	Cubital fossa (Bicipital aponeurosis) • common tendons (Extensor, Flexor) • Interosseous membrane of the forearm • compartment of forearm (Posterior, Anterior) • Carpal tunnel • fascia (Antebrachial fascia)
Hand	Anatomical snuff box • reticula of the hand (Extensor, Flexor) • Finger • Extensor expansion • Palmar aponeurosis