muscular branches of ulnar nerve muscular branches of ulnar nerve the muscular branches of ulnar nerve are a variety of branches of the ulnar nerve. one supplies the flexor carpi ulnaris muscle (a superficial muscle of the anterior compartment of the forearm), while the other supplies the ulnar half of the flexor digitorum profundus muscle (a deep muscle of the anterior compartment of the forearm). muscular branches of ulnar nervedetailsfromulnar nerveinnervatesflexor carpi ulnaris, flexor digitorum profundusidentifierslatinrami musculares nervi ulnarista98a14.2.03.041ta26450fma44874 75501, 44874anatomical terms of neuroanatomy structure the muscular branches of the ulnar nerve arise at the elbow. multiple branches may supply each muscle. variation the branching pattern of the muscular branches of the ulnar nerve varies significantly. function the muscular branches of the ulnar nerve supply two flexor muscles of the anterior compartment of the forearm: flexor carpi ulnaris muscle, a superficial muscle. the ulnar / medial half of the flexor digitorum profundus muscle, a deep muscle.