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metacarpal
noun
Any of the bones of the metacarpus.
synonyms
Exact(49)
The artiodactyl method of limb support through the third and fourth toes, with the attendant lengthening of lower limb bones, has frequently led to a fusion of the two principal metacarpal and metatarsal (midfoot) bones in the forelegs and hindlegs, respectively, forming cannon bones.
The distal row is firmly attached to the metacarpal bones of the hand.
These digits are retained in the living Equidae only as functionless, vestigial slivers of bone on either side of the third metacarpal and metatarsal.
Patients who have pseudohypoparathyroidism may have skeletal abnormalities, including a short neck and extremities and shortened metacarpal bones, and may have abnormal physical features, characterized primarily by a rounded face.
In addition, the second finger of the hand (not the third, as in other animals) is invariably the longest; the thumb is borne on a short metacarpal bone that is offset at its far end, so that the thumb diverges somewhat from the other fingers.
Early theropods such as Coelophysis had four fingers, with the fifth reduced to a nubbin of the metacarpal and the fourth greatly reduced.
Similar(8)
These are typified by relatively long tails, long fifth toes, sharply pointed teeth, and only slightly elongated wing metacarpals (palm bones).
Lateral metatarsals and metacarpals survive in chevrotains; splints of lateral metacarpals often survive in bovids; and either upper or lower splints of metacarpals in deer.
In humans the five metacarpals are flat at the back of the hand and bowed on the palmar side; they form a longitudinal arch that accommodates the muscles, tendons, and nerves of the palm.
Major modifications include restriction of the motion of the elbow and wrist joints to one plane, reduction of the number of digits, loss of functional claws, fusion of certain bones of the "hand" (the metacarpals and most of the carpals) into a carpometacarpus, and modification of the elements, especially those toward the tip of the limb (distal), for the attachment of feathers.
The carpometacarpus consists of fused carpals (bones of the wrist) and metacarpals (bones of the palm), metacarpals II and III (or III and IV) contributing the greater part of the bone.
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