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Forearm
Forearm labeled.png
Upper limb, forearm pronated. The forearm is the part of the upper limb between the elbow and the wrist.
Latin antebrachium
MeSH Forearm

The forearm is the structure and distal region of the upper limb, between the elbow and the wrist.[1]. The term forearm is used in anatomy to distinguish it from the arm which is often misused to describe the entire appendage of the upper limb and technically means only the region of the upper arm whereas the lower "arm" is called the forearm. It is homologous to the leg that lies between the knee and the ankle joints.

Contents

The human forearm

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.

Anatomy

Bones

Joints

Muscles

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". The intrinsic muscles of the forearm act on the forearm, meaning, across the elbow joint and the proximal and distal radioulnar joints (resulting in pronation or supination, whereas the extrinsic muscles 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.

Nerves

(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)

Vessels

Other structures

Additional images

Pathology

References

  1. ^ Forearm at eMedicine Dictionary

External links

See also


Simple English

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 part of the human arm between the elbow and the wrist.








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