Two Minutes of Anatomy Metacarpophalengeal Joints MCP Jts

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Metacarpophalangeal (MCP) joints. • Transition between palm and fingers. Articulation of metacarpal head of the hand and proximal phalanx of the finger. • Multiaxial joint allows flexion, extension, abduction and adduction. • Dynamically coordinates with interphalangeal (IP) joints to perform thumb opposition and composite finger flexion. • Thumb MCP Joint • Proximal convex surface of first metacarpal bone is opposed by elliptical cavity of proximal phalanx. • Two sesamoid bones secured by intersesamoid ligaments are present in palmar aspect of joint capsule. • Hinge joint allows 80 to 90o of flexion with minimal extension, adduction or abduction. • Provides additional flexion to thumb in opposition, permitting grasping and contouring objects to facilitate fine motor tasks. • Fingers Two through Five MCP Joint • Oval convex metacarpal surface that articulates with a concave, shallow proximal phalangeal surface. • Shallow ball and socket joint enables flexion, extension, abduction, adduction and limited circumduction. • Much less restricted in motion compared to thumb MCP joint. • References • Anatomy, Shoulder and Upper Limb, Hand Carpal Bones https://www.ncbi.nlm.nih.gov/books/NB... • Wrist Imaging https://www.ncbi.nlm.nih.gov/books/NB... • Carpometacarpal (CMC) joints. Where wrist connects to hand. • First CMC (aka CMC1 and Trapeziometacarpal) Articulation between trapezium and base of first metacarpal. • Base of second metacarpal articulates with trapezium, trapezoid and capitate. • Base of third metacarpal articulates with capitate. • Base of fourth metacarpal articulates with capitate and hamate. • Fifth metacarpal base articulates with hamate. • References • Anatomy, Shoulder and Upper Limb, Hand Carpal Bones https://www.ncbi.nlm.nih.gov/books/NB... • Anatomy, Shoulder and Upper Limb, Sternoclavicular Joint https://www.ncbi.nlm.nih.gov/books/NB... • Carpal Bones: Bones of wrist that connect distal aspects of radius and ulna of forearm to bases of five metacarpal bones of hand. • Eight carpal bones. Two rows Proximal row and distal row. • Proximal (Radial to ulnar): Scaphoid, lunate, triquetrum and pisiform. • Distal (Radial to ulnar): Trapezium, trapezoid, capitate and hamate. • Carpals: Proximal Row • Scaphoid: Forms radial border of proximal carpal row. • Lunate: Located between scaphoid and triquetrum. Lies near median nerve. • Triquetrum: Articulates with pisiform, lunate and hamate bones. • Pisiform: Articulates with triquetrum. Serves as attachment site for various tendons and ligaments. • Carpals: Distal Row • Trapezium: Between scaphoid and base of first metacarpal. Has a saddle-shaped facet for articulation with first metacarpal and provides a site for a few tendons and ligaments to either pass through or attach. • Trapezoid: Located between trapezium and capitate. • Capitate: Largest and most central carpal bone with articulations to several bones and attachments to several intercarpal ligaments. • Hamate: Named for its hook. Forms ulnar border of distal carpal row that serves to protect ulnar artery and nerve within Guyon's canal. Provides attachments to several ligaments. • Dr Donald A Ozello DC of Championship Chiropractic in Las Vegas, NV • Web Site: http://www.championshipchiropractic.com/ • Blog: https://www.championshipchiropractic.... • Twitter: / drdozellodc • Facebook: / championship-chiropractic-280141628688300 • LinkedIn: / dr-donald-a-ozello-dc-716b3233 • YouTube: / drdozellodc • Running: Maximize Performance Minimize Injuries https://www.amazon.com/Running-Perfor... • ***Disclaimer: Viewing this video does not take the place of seeing a medical professional, receiving proper training in the medical profession or working with a fitness professional. Please visit a medical professional for evaluation, diagnosis and treatment. Please work with a fitness professional to learn proper exercise technique and to develop a proper training program. Never perform an exercise that elicits or intensifies symptoms. If an exercise elicits or intensifies symptoms, stop immediately and use a viable substitute. Please receive proper medical training before attempting these medical procedures.

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