part of part of has muscle origin has muscle origin has muscle insertion has muscle insertion interosseous muscle of manus EMAPA:36216 UBERON:0001502 The interosseous muscles are flexor muscles of the manus that help support and flex the metacarpophalangeal joints. In some species the muscles are known as the suspensory ligaments. The muscles are found under the deep digital flexor tendon and originate from the base of each metacarpal bone. From its origin each muscle runs a short way down until it divides into two tendons that continue down and insert onto the base of its corresponding proximal phalanx. Each tendon has a sesamoid imbedded within it, that lie over the metacarpophalangeal joint. A small tendon, sometimes known as an extensor branch, continues to proceed from the base of each proximal phalanx and connects to the common extensor tendon. It has a small role to play in the extension of each phalanx. The main innervation of this muscle is via a branch of the ulnaris nerve[MURDOCH:1022]. NCIT:C53173 MA:0002313 interosseous muscle of hand manus interosseous muscle Any of the interosseous muscles of the manus (hand). This includes the dorsal and plantar interossei. SCTID:265804003 UMLS:C0224295 hand interosseous muscle FMA:37417 proximal phalanx of manus metacarpal bone manus interosseous muscle of autopod intrinsic muscle of manus