Phalanges The phalanges are individual hinge joints that flex and extend. Tendons insert on various aspects of the phalanges to control which joints move. Muscles Phalangeal Flexor:
Flexor Digitorum Profundus Attaches distally to all 4 lateral phalanges Phalangeal Extensor: Extensor Digitorum Much like the Extensor digitorum longus of the foot/ankle, the Extensor Digitorum attaches distally to all 4 digits and EXTENDS the fingers.
Phalangeal Muscles Digiti Minimi: Anything labeled digiti minimi involves the pinkie finger. Examples: Flexor Digiti Minimi Opponens Digiti Minimi Abductor Digiti
Minimi Pollicis The pollicis, aka the thumb joint is considered to be a saddle joint. This joint allows a variety of different movements that include Flex/Ext, Add/Abd and Circumduction.
Pollicis Muscles Flexors/Extensors Flexor Pollicis Longus/Brevis Action: Thumb Flexion Extensor Pollicis Longus/Brevis Action: Thumb Extension Adductors/Abductors Adductor Pollicis Action: Thumb Adduction
Abductor Pollicis Longus/Brevis Action: Thumb Abduction Thumb and Pinkie Movements - https:// www.youtube.com/watch?v=zyl6eoU-3Rg Time: ~ Minute 4:00 through minute 6-6:30. Wrist Movers Most wrist muscles are considered to be flexors
and extensors, but they can often times have degrees of radial and ulnar deviation depending on their origin/insertion points on the hand and forearm. Radial and Ulnar Deviation Radial Deviation: Abduction of the wrist.
Having the wrist move towards the thumb side. Usually combined with movements such as Flexion and/or Extension. All muscles that involve either Ulnar/Radial deviation, typically have the bone that the wrist deviates towards in the name: Example: Both of the following have Radial Deviation Flexor Carpi Radialis
Extensor Carpi Radialis Longus Radial and Ulnar Deviation Ulnar Deviation: Adduction of the wrist. Having the wrist move towards the pinkie side. Also is usually combined with other movements such as extension/flexion. Muscles named with Ulna, typically have ulnar deviation
involved. Example: Extensor Carpi Ulnaris Flexor Carpi Ulnaris Wrist Muscles Flexors: Muscles that cross the wrist joint and create a movement where the palm of your hand moves toward the forearm. Extensors: Muscles that
cross the wrist joint and create a movement where the back of the hand moves towards the forearm. Wrist Flexors and Extensors Flexion: Flexor Carpi Ulnaris (Some Ulnar Deviation) Flexor Carpi Radialis (Some Radial Deviation) Palmaris Longus This Tendon sometimes is used for repairs throughout the body. **Most commonly the UCL tendon of the Elbow**
Extension: Extensor Carpi Radialis Longus (Radial Deviation) Extensor Carpi Radialis Brevis (Midline) Extensor Carpi Ulnaris (Ulnar Deviation) Forearm Movement Because of how the forearm is structured with the Radial heads ability to roll over the Ulna on the radial notch, The forearm has muscles that originate and insert on each other to create supination and pronation of the forearm.
Forearm Muscles Supination: Supinator: Supinates the forearm Wraps around the lateral side of the forearm bones Pronation: Pronator Teres Longer of the 2 pronator muscles AND it crosses the elbow joint.
Pronator Quadratus The distal pronator muscle is a located down by the anterior aspect of the wrist. Key Points Muscles of the Hand, Wrist and Forearm are named directly for the action that they create. I.E. Flexion, Extension, Abduction, etc. Pollicis is Latin for of the Thumb Digiti Minimi is used often when referring to a
muscle that attaches to, and therefore also moves, the pinkie finger. One last look at the muscles of the Hand, Wrist and Forearm
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