Pronunciation (LUM-bri-culs) profundus Origin/Proximal Attachment Tendon of flexor digitorum Insertion/Distal Attachment Extensor hood of digits 2-5 Action/Relevance Flexes the fingers (at the metacarpophalangeal joints) Extend interphalangeal joints Innervation 1&2: Median nerve (C8, T1) 3&4: Ulnar nerve - deep branch (C8, T1) | 
