Name Dorsal interossei (hand)Pronunciation (DOR-sal In-ter-OSS-e-ey e) Origin/Proximal Attachment Between each metacarpal Insertion/Distal Attachment Directly distal to the origin on the base of the proximal phalanges 2 – 4, closest to the midline; extensor hood of the same digit/s Action/Relevance Abducts the fingersFlexes the fingers (at the MCP while IP joints are extended) Innervation Ulnar nerve - deep branch (C8, T1) | 
