FASCL# AND MUSCLES OF THE FOREARM AND MANUS 305 
Structure.—It is almost entirely fleshy. The deep face is adherent to the joint 
capsule. 
Relations.—Superficially, the triceps muscle; deeply, the humerus and the 
elbow joint. 
Blood-supply.—Deep brachial artery. 
Nerve-supply.—Radial nerve. 
IV. FASCIZ AND MUSCLES OF THE FOREARM AND MANUS 
(FASCI# ET MUSCULI ANTIBRACHII ET MANUS) 
The forearm is covered on three sides by the muscles of this group, leaving 
the medial surface of the radius for the most part subcutaneous. The extensors of 
the carpus and digit lie on the 
dorsal and lateral parts of the 
region, while the flexors oc- 
cupy the volar surface. 
The fascia of the fore- 
arm (Fascia antibrachii) 
forms a very strong and com- 
plete investment for all the 
muscles of the region. The 
superficial fascia is thin, and 
blends at the carpus with the 
deep fascia; it furnishes inser- 
tion to the posterior super- 
ficial pectoral muscle. The 
deep fascia is very strong and 
tendinous in character. It 
furnishes insertion at its 
proximal and medial part to 
the tensor fascie antibrachii 
muscle; at its proximal anter- 
ior and lateral part to the 
brachiocephalicus and biceps. 
It is attached at the elbow to 
the lateral tuberosities of the 
humerus and radius, to the 
ulna, and to the collateral Fic. 278.—Dicir or Horse; Voiar VIEW. 
i ie reed | FD Meee: 16 ceria Se ans 20 oe a 
surface of the forearm it ment; 1/1, cartilage of third phalanx; 24, digital cushion. (After Ellen- 
blends with the periosteum berger-Baum, Anat. fiir Kiinstler.) 
on the subcutaneous surface 
of the radius. It is closely adherent to the surface of the extensor muscles, but is 
i, ----~-Deep flexor tendon 
i-----Distal end of small metacarpal bone 
| a ~Suspensory ligament 
4\---- Branch of superficial flexor tendon 
*\...Distal digital annular ligament 
___ Upper border of cartilage 
of third phalanx 
| rather loosely attached to the flexors; near the carpus it blends with the tendons 
_ attached to the accessory carpal bone. From its deep face are detached intermus- 
cular septa, which form sheaths for the muscles and are attached to the underlying 
bones. The principal septa are: (a) One which passes between the common digital 
extensor and the lateral extensor and ulnaris lateralis; (b) one between the com- 
mon extensor and the extensor carpi radialis; (c) one between the medial and middle 
flexors of the carpus. 
The carpal fascia (Fascia carpi) is a direct continuation of that of the forearm. 
It is attached chiefly to the tuberosities at the distal end of the radius, to the ac- 
cessory carpal bone, and to the carpal collateral ligaments. In front it forms the 
So-called dorsal annular ligament of the carpus (Lig. carpi dorsale), bridging over 
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