Hand Muscles

Check my Hand Functions due to the muscle loss in my last post Muscle-loss

Forearm Muscles:
Forearm has two compartments  Posterior &  Anterior

Posterior Compartment

Hand Muscles Posterior

Superficial muscles :

• Brachioradialis flexes at the elbow.
• Extensor Carpi Radialis Longus and Brevis extends and abducts the wrist.
• Extensor Digitorum extends medial four fingers at the MCP and IP joints.
• Extensor Digiti Minimi extends the little finger and contributes to extension at the wrist.
• Extensor Carpi Ulnaris extension and adduction of wrist.
• Anconeus moves the ulna during pronation and extends at the elbow joint.

Hand Muscles Posterior 2

Deep Muscles:

• Supinator supinates the forearm.
• Abductor Pollicis Longus abducts the thumb.
• Extensor Pollicis Brevis extends at the metacarpophalangeal and carpometacarpal joints of the thumb.
• Extensor Pollicis Longus extends all joints of the thumb: carpometacarpal, metacarpophalangeal and interphalangeal.
• Extensor Indicis extends the index finger.

 Anterior Compartment

Hand muscles - Anterior 1

Superficial:

• Flexor Carpi Ulnaris flexion and adduction at the wrist.
• Palmaris Longus flexion at the wrist.
• Flexor Carpi Radialis flexion and abduction at the wrist.
• Pronator Teres pronation of the forearm.

Hand Muscles - Anterior 2

Intermediate:

• Flexor digitorum superficialis flexes the metacarpophalangeal joints and proximal interphalangeal joints at the 4 fingers, and flexes at the wrist.

Hand Muscles - Anterior

Deep:

• Flexor Digitorum Profundus is the only muscle that can flex the distal interphalangeal joints of the fingers. It also flexes at metacarpophalangeal joints and at the wrist.
• Flexor Pollicis Longus flexes the interphalangeal joint and metacarpophalangeal joint of the thumb.
• Pronator Quadratus pronates the forearm.

Source: https://teachmeanatomy.info/
I read & learnt from the above site