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

Bellwork Complete only the B portion of the BLT chart writing what you know about the hand and wrist. Then put BLT chart aside until the end of the lesson.

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

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

Joints of the Hand & Wrist Radiocarpal joint (wrist joint) Carpal joints Metacarpal 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

Metacarpal Joints Articulation between the metacarpals and the phalanges 1st MCP (thumb) is a saddle joint Allows flexion, extension, abduction, adduction and rotation 2nd through 5th MCP joints are condyloid joints Allow flexion, extension, abduction, adduction and circumduction

Phalangeal Joints Type of joint: hinge Allow flexion and extension Two categories of phalangeal joints: proximal distal 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: Wrist extensors: group of muscles located on the anterior part of the wrist perform flexion of the wrist 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

Closure Finish your “L” and “T” columns on your BLT sheet Share your information with a partner