Moro reflex

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Moro reflex

flexion of an infant's thighs and knees, fanning and then clenching of fingers, with arms first thrown outward and then brought together as though embracing something; produced by a sudden stimulus, such as striking the table on either side of the child, and seen normally in the newborn. Called also embrace reflex.
The Moro reflex occurs when the infant is startled.

star·tle re·flex

a primitive reflex response observed in the normal newborn but typically suppressed by 3-4 months of age. Any sudden stimulus (for example, a loud noise, a blow to the supporting surface, or being dropped 5-10 cm through space) causes flexion of the hip and knee joints with fanning of the fingers followed by fist clenching and extension of the upper limbs followed by flexion. Synonym(s): Moro reflex, parachute reflex, startle reaction
See also: cochleopalpebral reflex.

Moro reflex

Etymology: Ernst Moro, German pediatrician, 1874-1951
a normal mass reflex in a young infant (up to 3 to 4 months of age) elicited by a sudden loud noise, such as by striking the table next to the child, or raising the head slightly and allowing it to drop. A normal response consists of flexion of the legs, an embracing posture of the arms, and usually a brief cry. Also called startle reflex.
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Moro reflex

Mo·ro re·flex

(mō'rō rē'fleks)
Response of infants at birth and for the first 3 months of life to acoustic stimuli characterized by extension and abduction of arms, hands, and fingers.


Ernst, German physician, 1874-1951.
Moro reflex - the reflex response of an infant when allowed to drop a short distance through the air or startled by a sudden noise or jolt. Synonym(s): startle reflex