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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 ...
The knuckles at the base of the fingers may be referred to as the 1st [1] or major knuckles while the knuckles at the midfinger are known as the 2nd [2] and 3rd, or minor, knuckles. However, the ordinal terms are used inconsistently and may refer to any of the knuckles. [3] [4]
Joints of the hand, X-ray Interphalangeal ligaments and phalanges. Right hand. Deep dissection. Posterior (dorsal) view. The PIP joint exhibits great lateral stability. Its transverse diameter is greater than its antero-posterior diameter and its thick collateral ligaments are tight in all positions during flexion, contrary to those in the metacarpophalangeal joint.
Fingers do not contain muscles (other than arrector pili). The muscles that move the finger joints are in the palm and forearm. The long tendons that deliver motion from the forearm muscles may be observed to move under the skin at the wrist and on the back of the hand. Muscles of the fingers can be subdivided into extrinsic and intrinsic muscles.
The pinky and index fingers are extended but a little more parallel to each other resembling the horns on a demon. Arizona State University Sun Devil fans make a pitchfork sign by extending the index and middle fingers, as well as the pinky. The thumb holds down the ring finger to complete the gesture.
The wearable device turns any surface into a keyboard.
Joint cracking is the manipulation of joints to produce a sound and related "popping" sensation. It is sometimes performed by physical therapists, chiropractors, and osteopaths [1] pursuing a variety of outcomes. The cracking of joints, especially knuckles, was long believed to lead to arthritis and other joint problems. However, this is not ...
Hand rubbing. Hand rubbing is a gesture that conveys in many cultures either that one has a feeling of excited expectation, or that one is simply cold. [1] In Ekman and Friesen's 1969 classification system for gestures, hand-rubbing as an indication of coldness is an emblem intentional gesture that could equally well be verbalized.