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Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.
 
Flexor pollicis longus is a flexor of the phalanges of the thumb; when the thumb is fixed, it assists in flexing the wrist. The Pronator quadratus rotates the radius upon the ulna, rendering the hand prone.


FIG. 417– Cross-section through the middle of the forearm. (Eycleshymer and Schoemaker.) (See enlarged image)


2. The Dorsal Antibrachial Muscles—These muscles are divided for convenience of description into two groups, superficial and deep.

The Superficial Group (Fig. 418).
Brachioradialis.
Extensor digitorum communis.
Extensor carpi radialis longus.
Extensor digiti quinti proprius.
Extensor carpi radialis brevis.
Extensor carpi ulnaris.
Anconæus.
  The Brachioradialis (Supinator longus) is the most superficial muscle on the radial side of the forearm. It arises from the upper two-thirds of the lateral supracondylar ridge of the humerus, and from the lateral intermuscular septum, being limited above by the groove for the radial nerve. Interposed between it and the Brachialis are the radial nerve and the anastomosis between the anterior branch of the profunda artery and the radial recurrent. The fibers end above the middle of the forearm in a flat tendon, which is inserted into the lateral side of the base of the styloid process of the radius. The tendon is crossed near its insertion by the tendons of the Abductor pollicis longus and Extensor pollicis brevis; on its ulnar side is the radial artery.

Variations.—Fusion with the Brachialis; tendon of insertion may be divided into two or three slips; insertion partial or complete into the middle of the radius, fasciculi to the tendon of the Biceps, the tuberosity or oblique line of the radius; slips to the Extensor carpi radialis longus or Abductor pollicis longus; absence; rarely doubled.

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