Finger Phalanges: Bones that make up the SKELETON of the FINGERS, consisting of two for the THUMB, and three for each of the other fingers.Toe Phalanges: Bones that make up the SKELETON of the TOES, consisting of two for the great toe, and three for each of the other toes.Fingers: Four or five slender jointed digits in humans and primates, attached to each HAND.Zinc Fingers: Motifs in DNA- and RNA-binding proteins whose amino acids are folded into a single structural unit around a zinc atom. In the classic zinc finger, one zinc atom is bound to two cysteines and two histidines. In between the cysteines and histidines are 12 residues which form a DNA binding fingertip. By variations in the composition of the sequences in the fingertip and the number and spacing of tandem repeats of the motif, zinc fingers can form a large number of different sequence specific binding sites.Toes: Any one of five terminal digits of the vertebrate FOOT.Bones of Upper Extremity: The bones of the upper and lower ARM. They include the CLAVICLE and SCAPULA.Foot Deformities, Congenital: Alterations or deviations from normal shape or size which result in a disfigurement of the foot occurring at or before birth.Hand Deformities, Congenital: Alterations or deviations from normal shape or size which result in a disfigurement of the hand occurring at or before birth.Metacarpal Bones: The five cylindrical bones of the METACARPUS, articulating with the CARPAL BONES proximally and the PHALANGES OF FINGERS distally.Platyrrhini: An infraorder of New World monkeys, comprised of the families AOTIDAE; ATELIDAE; CEBIDAE; and PITHECIIDAE. They are found exclusively in the Americas.Metacarpophalangeal Joint: The articulation between a metacarpal bone and a phalanx.Forelimb: A front limb of a quadruped. (The Random House College Dictionary, 1980)Nails, Malformed: Deformities in nail structure or appearance, including hypertrophy, splitting, clubbing, furrowing, etc. Genetic diseases such as PACHYONYCHIA CONGENITA can result in malformed nails.Hoof and Claw: Highly keratinized processes that are sharp and curved, or flat with pointed margins. They are found especially at the end of the limbs in certain animals.Thumb: The first digit on the radial side of the hand which in humans lies opposite the other four.Brachydactyly: Congenital anomaly of abnormally short fingers or toes.Syndactyly: A congenital anomaly of the hand or foot, marked by the webbing between adjacent fingers or toes. Syndactylies are classified as complete or incomplete by the degree of joining. Syndactylies can also be simple or complex. Simple syndactyly indicates joining of only skin or soft tissue; complex syndactyly marks joining of bony elements.Metacarpus: The region of the HAND between the WRIST and the FINGERS.