‘ MUSCLES ON FRONT AND INNER ASPECT OF FOREARM. 325 
the flexor carpi radialis and the flexor carpi ulnaris, and covers the flexor sublimis 
digitorum. In the lower third 
of the forearm its tendon is 
placed directly over the median 
nerve, along the outer border 
of the tendons of the flexor 
sublimis digitorum. 
BICEPS Brachial artery 
Median nerve 
The palmaris longus is the most 
variable muscle in the:body, and is 
often absent (10 per cent). 
Ulnar nerve 
The flexor carpi ulnaris 
Og Musculo-spiral 
muscle has a double origin, from EER en keke 
the humerus and from the ee 6. 
5 RACHIO- Semilunar fascia 
ulna. (1) It arises from the RADIALIS (reflected) 
common tendon attached to ae 
EXTENSOR 
the condyle of the humerus, — carpr Rapracis 
the fascia over it, and an inter- ee 
Posterior interosseous 
muscular septum externally. . nerve ORIGINS OF 
(2) By means of the deep Se ere SUPERFICIAT, MUSCLES 
fascia of the forearm it obtains Radial nerve Umar) #2 
an attachment to the olecranon aS es 
process and the posterior SES 
border of the ulna in its upper hate 
three-fifths. The fleshy fibres ae 
join a tendon which hes on the I nadiat «=O 
anterior border of the muscle — Bracnto-rapraris 
ay is inserted into the pisi- | EXTENSoR caRrr 
orm bone. EXTENSOR CARPI 
The muscle is superficially —-®4pratis Brevior 
placed along the inner border pacon LONeys 
of the forearm. It lies in- 
ternal to the palmaris longus 
and flexor sublimis digitorum, we 
and conceals the flexor pro- — yeracinrr routes 
fundus digitorum. The ulnar ferences 
nerve (which enters the fore-  — Raprauis cate gf 
arm between the two heads of Muscular branch 
origin of the muscle) is con- “™""™" Z 
cealed by it in its whole length. 
The ulnar artery hes under 
cover of the muscle in its lower 
two-thirds. The tendon of 
the muscle serves as a guide 
to the artery in the lower half 
of the forearm. 
The flexor sublimis digi- | 
torum occupies a deeper plane —Frrxor toncus ff 
than the four previous muscles. nae 
It has a threefold origin, from 
the humerus, radius, and ulna. 
~ (1) The chief or humeral origin 
is from the internal condyle of 
the humerus by the common F'!¢. 241.—THE MuscLEs AND NERVES ON THE FRONT OF THE 
tendon, from the internal RO gE Me ae 
lateral ligament of the elbow, 
and from adjacent intermus- 
cular septa. (2) The ulnar origin is by a slender fasciculus from the inner border 
of the coronoid process of the ulna, above the origin of the pronator radii teres. 
FLEXOR CARPI ULNARIS 
Ulnar artery 
Division of ulnar nerve 
Deep branch 
Anterior annular 
ligament 
OPPONENS POLLICIS 
ABDUCTOR POLLICIS 
FLEXOR BREVIS POLLICIS 
) TENDONS OF FLEXOR 
j SUBLIMIS DIGITORUM 
\ TENDONS OF 
-FLEXOR PRO- 
J FUNDUS DIGITORUM 
The pronator radii teres, flexor carpi radialis, and palmaris longus 
have been removed. 
