Brachioradialis

Muscle infobox
Name = Brachioradial muscle
Latin = musculus brachioradialis
GraySubject = 125
GrayPage = 451
Width = 125


Caption = Anterior view of muscles of the left forearm with Brachioradialis shown in blue.


Caption2 = Cross-section through the middle of the forearm. (Brachioradialis labeled at center left, sixth from the top.)
Origin = Lateral supracondylar ridge of the humerus
Insertion = Distal radius (Radial styloid process)
Blood = radial recurrent artery
Nerve = radial nerve
Action = Flexion of forearm
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DorlandsPre = m_22
DorlandsSuf = 12548506

Brachioradialis is a muscle of the forearm that acts to flex the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm. It is attached to the distal styloid process of the radius and the lateral supracondylar ridge of the humerus.

Action

Brachioradialis flexes the forearm at the elbow. When the forearm is pronated, the brachioradialis tends to supinate as it flexes. In a supinated position, it tends to pronate as it flexes.

The brachioradialis is a stronger elbow flexor when the forearm is in a midposition between supination and pronation at the radioulnar joint. When pronated, the brachioradialis is more active during elbow flexion since the biceps brachii is in a mechanical disadvantage.

Innervation

Despite the bulk of the muscle body being visible from the anterior aspect of the forearm, the brachioradialis is a posterior compartment muscle and consequently is innervated by the radial nerve. Of the muscles that receive innervation from the radial nerve, it is one of only four that receive input directly from the radial nerve. The other three are the triceps, anconeus, and extensor carpi radialis longus. (All other posterior compartment muscles that receive radial innervation are supplied by the deep branch of the radial nerve.)

=Additional

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Left_humerus._Anterior_view._Image:Gray213.png|Bones_of_left_forearm._Anterior_aspect._Image:Gray414.png|Front_of_the_left_forearm._Superficial_muscles._Image:Gray418.png|Posterior_surface_of_the_forearm._Superficial_muscles._Image:Gray525.png|The_brachial_artery._Image:Gray527.png|The_radial_and_ulnar_arteries._Image:Gray528.png|Ulnar_and_radial_arteries._Deep_view._Image:Nerves_of_the_left_upper_extremity.gif|Nerves_of_the_left_upper_extremity.

External links

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* - "Transverse section through the left arm just proximal to the elbow."
* - "Superficial muscles of the anterior (flexor) compartment of the left forearm."
* - "Superficial muscles of the posterior (extensor) compartment of the left forearm."
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