IMAGIN.

Although these muscles are placed in the forearm there main purpose is to extend and flex the hand.

Although there are nearly 39 active muscles that move the hand and forearm, there are generally four actions that facilitate hand motion. These actions are abduction, adduction, flexing, and extending. Ther names are also dependent on their location.

• Brachioradialis

  • Flexes your forearm

• Supinator 

  • Rotation of forearm outward, so your palm faces up.

• Anconeus. 

  • Extend your elbow and rotate your forearm 

• Pronator

  • Pronator quadratura

    • Rotates your forearm

  • Pronator teres

    • Rotates the forearm towards the face

• Interossei

  • ​Four dorsal and three palmar muscles

  • Allows hand for the adduction and abduction of the metacarpals (MCP)​

• Lumbricals

  • Placed on the dorsal portion of the hand​

  • muscle pulling allows for fingers to extend

• Abductor

  • Abductor Digiti Minimi (Hypothenar)

    • allows the small finger to pull away from the ring finger

  • Abductor pollicis brevis (Thenar)

    • Pulls the thumb away from the index finger

  • Abductor pollicis longus 

    • Pulls thumb away from hand​

• Adductor

  • Adductor pollicis​

    • Pulls thumb inward​

    • Possibly for pinching

• Opponens

  • Opponens digiti minimi (Hypothenar)

    • Allows for the cupping of hands

    • When hands cup the metacarpals have to shift to be able to form a "bowl" like shape​

    • Bringing the small finger towards the thumb

  • O​pponens pollicis  (Thenar)

    • brings the thumb away from the fingers 

    • allows for pinching and grasping

• Flexors

  • Flexor Carpi Radialis​

    • Flex and abduct the ​hand

  • Flexor Carpi Ulnaris​​

    • Flex and adduct the hand​​

  • Flexor digitorum superficialis

    •  Flexes your second, third, fourth, and fifth fingers

  • Flexor pollicis longus

    • Flexes your thumb.

  • Flexor digitorum Profundus

    • Flex wrist and fingers​

  • Flexor digiti minimi (Hypothenar)

    • Flexes the small finger to bend at the MCP joint.

  • ​Flexor pollicis brevis  (Thenar)

    • bends the thumb toward the small finger​

• Extensors

  • Extensor indices

    • Extends your index finger.

  • Extensor Carpi Radialis Longus​

    • Extends and abducts the hand​

  • Extensor Carpi Ulnaris

    • Extends and adducts hand

  • Extensor digitorum

    • Extends the four fingers (excluding the thumb)​

  • Extensor pollicis brevis

    • Extend and abduct the thumb​

  • Extensor Carpi Radialis Brevis 

    • ​Extend and abduct the wrist​​​​​​