Pronunciation (PALM-er in-ter-OSS-E-I) Origin/Proximal Attachment From the side of the metacarpal that faces the midline Insertion/Distal Attachment On the base of the proximal phalanx of the digit of origin (same side toward the midline); extensor hood of the same digit/s Action/Relevance Adducts the fingersFlexes the fingers (at the MCP while IP joints are extended) Innervation Ulnar nerve - deep branch (C8, T1) | 
