simian crease

crease (krēs) a line or slight linear depression.

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flexion crease , palmar crease any of the normal grooves across the palm that accommodate flexion of the hand by separating folds of tissue.

simian crease  a single transverse palmar crease formed by fusion of the proximal and distal palmar creases; seen in congenital disorders such as Down syndrome.

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simian crease

[sim′ē·ən]

Etymology: L, simia, ape; ME, creste, crest

a single crease across the palm produced from the fusion of proximal and distal palmar creases, seen in congenital disorders, such as Down syndrome. Also called simian line.

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simian crease (sim´ēn),

n a single crease across the palm produced from the fusion of proximal and distal palmar creases, seen in such congenital disorders as Down syndrome.

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simian crease

Simian fold Neonatology A dermatoglyphic pattern of a single deep transpalmar crease formed by fusion of proximal and distal palmar creases, classically seen in trisomy 21, but also in trisomies 13 and 9, fetal trimethadione syndrome. See Dermatoglyphics. Cf Triradius.