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  2. Interphalangeal joints of the hand - Wikipedia

    en.wikipedia.org/wiki/Interphalangeal_joints_of...

    Flexion Extension fingers the flexor digitorum profundus acting on the proximal and distal joints, and the flexor digitorum superficialis acting on the proximal joints mainly by the lumbricals and interossei, the long extensors having little or no action upon these joints thumb the flexor pollicis longus: the extensor pollicis longus

  3. Metacarpophalangeal joint - Wikipedia

    en.wikipedia.org/wiki/Metacarpophalangeal_joint

    The movements which occur in these joints are flexion, extension, adduction, abduction, and circumduction; the movements of abduction and adduction are very limited, and cannot be performed while the fingers form a fist. [2] The muscles of flexion and extension are as follows:

  4. Anatomical terms of motion - Wikipedia

    en.wikipedia.org/wiki/Anatomical_terms_of_motion

    Extension is the opposite of flexion, a straightening movement that increases the angle between body parts. [12] For example, when standing up, the knees are extended. When a joint can move forward and backward, such as the neck and trunk, extension is movement in the posterior direction. [ 10 ]

  5. Flexion vs. Extension: What's the Difference for Your Workout?

    www.aol.com/lifestyle/difference-between-flexion...

    Flexion and extension describe the basic ways your body moves at its joints. Here's what that means for your workouts and training.

  6. Ulnar claw - Wikipedia

    en.wikipedia.org/wiki/Ulnar_claw

    A hand imitating an ulnar claw. The metacarpophalangeal joints of the 4th and 5th fingers are extended and the Interphalangeal joints of the same fingers are flexed.. An ulnar claw, also known as claw hand or Spinster’s Claw, is a deformity or an abnormal attitude of the hand that develops due to ulnar nerve damage causing paralysis of the lumbricals.

  7. Dorsal interossei of the hand - Wikipedia

    en.wikipedia.org/wiki/Dorsal_interossei_of_the_hand

    In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from the hand's midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers. [1]

  8. Volkmann's contracture - Wikipedia

    en.wikipedia.org/wiki/Volkmann's_contracture

    Volkmann's contracture is a permanent flexion contracture of the hand at the wrist, resulting in a claw-like deformity of the hand and fingers. Passive extension of fingers is restricted and painful. Passive extension of fingers is restricted and painful.

  9. Muscles of the hand - Wikipedia

    en.wikipedia.org/wiki/Muscles_of_the_hand

    The radial nerve innervates the finger extensors and the thumb abductor; that is, the muscles that extend at the wrist and metacarpophalangeal joints (knuckles) and abduct and extend the thumb. The median nerve innervates the flexors of the wrist and digits, the abductors and opponens of the thumb, the first and second lumbricals. The ulnar ...