Palmar grasp reflex

The palmar grasp reflex is a primitive and involuntary reflex found in infants of humans and most primates. When an object, such as an adult finger, is placed in an infant's palm, the infant's fingers reflexively grasp the object. Placement of the object triggers a spinal reflex, resulting from stimulation of tendons in the palm, that gets transmitted through motor neurons in the median and ulnar sensory nerves.

The reverse motion can be induced by stroking the back or side of the hand.
A fetus exhibits the reflex in utero by 28 weeks into gestation, and persists until development of rudimentary fine motor skills between two and six months of age.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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