VIBS 305 Study Guide - Midterm Guide: Metacarpophalangeal Joint, Phalanx Bone, Carpometacarpal Joint

• School: Texas A&M University
• Department: Vet Integrative Biosci
• Course: VIBS 305
• Professor: Michelle D.Pine

Document Summary

Antebrachiocarpal joint: between the radius and ulna and the proximal row of carpals. Middle carpal joint: between the proximal and distal rows of carpal bones. Carpometacarpal joint: between the distal row of carpal bones and the proximal bases of metacarpal bones: the phalangeal joints have 3 parts. Metacarpophalangeal joints: between distal heads of metacarpals and proximal phalanges. Proximal interphalangeal joints: between proximal and middle phalanges. For example, the deep digital flexor muscle flexes the carpal, metacarpophalangeal, and both the proximal and distal interphalangeal joints. A fixation muscle to its action on the carpal joints must only extend the carpal joints. You cannot pick a muscle that also acts to extend the metacarpophalangeal joints or interphalangeal joints. The flexor angle is the part that moves at the joint it either increases (extends the joint), or decreases (flexes the joint: an agonist or prime mover is the muscle that contracts. The antagonist relaxes so the prime mover may exert its action.