Hand & Wrist Muscular Anatomy JOINTS & MUSCULAR ANATOMY Hand & Wrist Muscular Anatomy

Write-Pair-Share Write and draw all the anatomical structures of the hand and wrist that you can recall from previous lessons on paper Share with a partner Be ready to share with the class

Recognize the types of joints of the hand & wrist Objectives Recognize the types of joints of the hand & wrist Recognize the relevant muscular anatomy for the hand & wrist

Terminology Saddle joint: an articulation between concave and convex ends of bones Gliding joint: a sliding articulation between two smooth bone surfaces

Joints of the Hand & Wrist Radiocarpal joint (wrist joint) Carpal joints Metacarpophalangeal joints Phalangeal joints Proximal interphalangeal (PIP) joint Distal interphalangeal (DIP) joint

Radiocarpal Joint The articulation between the radius and the carpal bones Type of joint: condyloid Allows flexion, extension, ulnar and radial deviation, and circumduction

Carpal Joints Type of joint: gliding Stabilized by various ligaments Allow limited movement

Metacarpophalangeal Joints Articulation between the metacarpals and the phalanges 1st MCP (thumb) is a saddle joint Allows flexion, extension, abduction, adduction and rotation

Metacarpophalangeal Joints 2nd through 5th MCP joints are condyloid joints Allow flexion, extension, abduction, adduction and circumduction

Interphalangeal Joints Type of joint: hinge Allow flexion and extension Two categories of phalangeal joints: proximal distal

Interphalangeal Joints Proximal interphalangeal (PIP) joint is the articulation between the proximal & intermediate phalanges Distal interphalangeal (DIP) joint is the articulation between the intermediate and distal phalanges Exception: The thumb only has an interphalangeal joint (IP) joint because it has just 2 phalanges

Muscles of the Wrist Wrist flexors: group of muscles located on the anterior part of the wrist perform flexion of the wrist

Wrist Extensors Wrist extensors: group of muscles located on the posterior part of the wrist perform extension of the wrist

Muscles of the Fingers Finger flexors: Finger extensors: muscles on the anterior part of the hand perform flexion of the fingers Finger extensors: muscles on the posterior part of the hand perform extension of the fingers

Why is knowing anatomy specifically important when evaluating a hand/wrist injury?