INTERNAL CUTANEOUS NERVE. 589 
through the lower half of the arm, it divides at the front of the elbow into its 
two terminal branches. 
Communication.—The internal cutaneous nerve communicates with the palmar 
branch of the ulnar nerve in the lower part of the forearin. 
Branches.—In the arm, as soon as it becomes superficial, the internal cutaneous 
nerve gives off a branch which supplies the skin of the lower half of the anterior 
surface of the arm on its inner side. At the elbow it divides into two terminal 
Trapezius 
Supraspinatus muscle 
(lower part) 
Scapular spine (cut) 
—Infraspinatus 
Rhomboideus eA 
major eres minor 
Scapular fascia — NERVE TO TERES MINOR 
: ‘IRCUMFLEX NERVE AND 
Dorsal Scapular Cr 3 
artery (branch of) 
Deltoid (reflected) 
CUTANEOUS BRANCH 
OF CIRCUMFLEX 
Triceps (outer head) 
Teres major 
Triceps (long head) 
Ms : \ 
Latissimus dorsi_- \ 
TM USCULO-SPIRAL 
Triceps (outer head) 
Brachialis anticus 
—Triceps (inner head) 
External intermuscular septum 
EXTERNAL CUTANEOUS 
- BRANCHES OF MUSCULO- 
) SPIRAL 
branches—anterior and internal, 
which, crossing over or under 
the median basilic vein, are dis- 
tributed to the inner side of the 
forearm. 
The anterior branch can be 
followed to the wrist and sup- pyar 
plies the whole of the front of %*8= | 
the forearm in the inner half; NY 
the internal branch is not so ‘tapi \ VAP) Scommon:tendon) 
large, and, passing obliquely -™™"s \ | | 
backwards and downwards over 
the origins of the pronator and 
flexor muscles, it is distributed to the upper two-thirds or three-fourths of the 
posterior aspect of the forearm on the inner side. 
Brachio-radialis 
Extensor carpi radialis longior 
Tal Anconeus 
Extensor muscles of forearm 
Fic. 434.—DELTOID REGION AND BACK OF ARM. 
LESSER INTERNAL CUTANEOUS NERVE. 
The lesser internal cutaneous nerve (n. cutaneus brachii medialis minor) arises 
from the inner cord of the brachial plexus, and ultimately from the first thoracic 
nerve (Fig. 429, p. 581). It lies at first between the axillary artery and vein; and 
after descending over, under, or even, in some cases, through the axillary vein, it 
