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A nail is a protective plate characteristically found at the tip of the digits (fingers and toes) of all primates, corresponding to the claws in other tetrapod animals. Fingernails and toenails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves and horns of vertebrates.
The precision grip is when the intermediate and distal phalanges ("fingertips") and the thumb press against each other. Examples of a precision grip are writing with a pencil, opening a jar with the fingertips alone, and gripping a ball (only if the ball is not tight against the palm). Thumb and index finger during pad-to-pad precision grasping ...
Claw. A domestic cat 's retractable claw in protracted position. A claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes (mammals, reptiles, birds). Some invertebrates such as beetles and spiders have somewhat similar fine, hooked structures at the end of the leg or tarsus for gripping a surface as they walk.
Pulmonology. Nail clubbing, also known as digital clubbing or clubbing, is a deformity of the finger or toe nails associated with a number of diseases, anomalies and defects; some congenital. This is mostly of the heart and lungs. [2][3] When it occurs together with joint effusions, joint pains, and abnormal skin and bone growth it is known as ...
Triphalangeal thumb. Triphalangeal thumb (TPT) is a congenital malformation where the thumb has three phalanges instead of two. The extra phalangeal bone can vary in size from that of a small pebble to a size comparable to the phalanges in non-thumb digits. The true incidence of the condition is unknown, but is estimated at 1:25,000 live births ...
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.
Once you get this invitation and the green light from your partner, ease your finger in, up to the first knuckle. Next, “hold here for 3, 2, 1 seconds, then take it out, and relubricate if ...
Female hands. Hand fetishism, [1] hand partialism or cheirophilia is the sexual fetish for hands. This may include the sexual attraction to a specific area such as the fingers, palm, back of the hand and/or nails, or the attraction to a specific action performed by the hands; which may otherwise be considered non-sexual—such as washing and drying dishes, painting of the fingernails and nail ...