. Cunningham's Text-book of anatomy. Anatomy. MUSCLES ON THE DOESAL SUEFACE OF THE FOEEAEM. 397 Triceps brachii (insertion) Biceps brachii (insertion) Supinator muscle (insertion) Abductor pollicis longus (origin) Pronator teres (insertion) M. Extensor Digitorum Communis.—The extensor digitorum communis arises from the common tendon, from the lateral epicondyle of the humerus, from the fascia over it, and from intermuscular septa on either side. Extending along the dorsum of the forearm it ends proximal to the wrist in four tendons, of which the most lateral often has a separate fleshy belly.
. Cunningham's Text-book of anatomy. Anatomy. MUSCLES ON THE DOESAL SUEFACE OF THE FOEEAEM. 397 Triceps brachii (insertion) Biceps brachii (insertion) Supinator muscle (insertion) Abductor pollicis longus (origin) Pronator teres (insertion) M. Extensor Digitorum Communis.—The extensor digitorum communis arises from the common tendon, from the lateral epicondyle of the humerus, from the fascia over it, and from intermuscular septa on either side. Extending along the dorsum of the forearm it ends proximal to the wrist in four tendons, of which the most lateral often has a separate fleshy belly. After passing beneath the dorsal carpal ligament in a compartment along with the extensor indicis proprius, the tendons separate on the dorsum of the hand, where the three most medial tendons are joined together by two obliquely placed bands. One passes distally and laterally, and connects to- gether the third and second ten- dons ; the other is a broader and shorter band, which passes also distally and laterally, and joins the fourth to the third tendon. In some cases a third band is present which passes distally and medially from the first to the second tendon; and frequently the tendon for the little finger is joined to the tendon for the ring finger, and separates from it only a short distance above the distal end of the metacarpal bone. The tendons are inserted in the following manner:—On the finger each tendon spreads out so as to form a membranous expan- sion over the knuckle and on the dorsum of the first phalanx. The border of the tendon is indefinite over the metacarpo - phalangeal articulation, of which it forms the dorsal ligament. On the dorsum of the first phalanx the tendon receives at its sides the insertions of the interosseous and lumbrical muscles. At the distal end of the first phalanx it splits into ill-de- fined median and collateral slips, proceeding over the dorsum of the first inter-phalangeal articulation, of which they form the dorsal ligament. Th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
