_a_, Cutaneous branch of axillary nerve; _b_, cutaneous branches of
radial nerve; _c_, posterior cutaneous branch of ulnar nerve; _d_,
cutaneous branch of median nerve; _e_, superficial branch of ulnar
nerve; _f_, external metacarpal nerve; _g_, anastomotic branch
connecting internal and external metacarpal nerves; _1_, external
head of triceps; _2_, extensor carpi radialis; _3_, anterior
extensor; _4_, flexor carpi externus. (After Ellenberger, in
Leisering’s Atlas.)
]