To reveal morphologic features of human flexor carpi ulnaris (FCU) for clinical application by investigating intramuscular nerve branches distribution and muscle architectural features of ulnaris compartment and radial compartment.

(1)Macroscopical dissection was used to observe the pattern on the whole and to measure the relevant data of 10 cadavers; (2)Sihler’s neural staining technique was used to observe the nerve branches distribution of 5 cadavers; (3)Ulnar compartment and radial compartment of human FCU of 10 cadvers were used to study the muscle architectural features.

(1)Two nerve branches from the ulnar nerve get into ulnar compartment and radial compartment respectively.Not only did the nerves of ulnar compartment and radial compartment deliver many branches to respective regions, but also these branches had plentiful joints.But between the nerve of ulnar compartment and that of radial compartment no joint occurred in the area of instramuscular tendon.(2)The muscle length, muscle weight, pinnate angle and cross sectional area of ulnar compartment of FCU were bigger than those the radial compartment, but architecture features of the muscle fiber length smaller than those of the radial compartment.

(1)The flexor carpi ulnaris can be divided into ulnar compartment and radial compartment and they have their own nerve.(2)Ulnar compartment and radial compartment are half pinnate muscle and the force produced by ulnar compartment is 1 times more than that by radial compartment.

Instramuscular nerve; Muscle compartment; Muscle architecture; Flexor carpi ulnaris