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Primitive reflexes are reflex actions originating in the central nervous system that are exhibited by normal infants, but not neurologically intact adults, in response to particular stimuli. These reflexes are suppressed by the development of the frontal lobes as a child transitions normally into child development . [ 1 ]
These reflexes are believed to be "hard-wired" before birth, and are therefore able to be elicited in the newborn. As the brain matures, certain areas (usually within the frontal lobes) exert an inhibitory effect, thus causing the reflex to disappear. When disease processes disrupt these inhibitory pathways, the reflex is "released" from ...
The asymmetrical tonic neck reflex (ATNR) is a primitive reflex found in newborn humans that normally vanishes around 6 months of age. It is also known as the bow and arrow or "fencing reflex" because of the characteristic position of the infant's arms and head, which resembles that of a fencer. When the face is turned to one side, the arm and ...
Palmar grasp reflex — in infants up to six months of age, a closing of the hand in response to an object being placed in it. Periroral reflex: when a finger is placed at the angle of the mouth and struck, or the nasolabial fold is stroked, mouth closure is induced via CN VII [1] Pharyngeal reflex — also known as the gag reflex.
The reflex is common in the elderly population and should not be taken as indicative of a dementing process. [ 1 ] A study conducted in a neurosurgical in-patient population showed there is no significant association between the side of the reflex and the side of the hemispheric lesion in patients with unilateral (one-sided) reflexes and ...
The presence of the Babinski sign can identify disease of the spinal cord and brain in adults, and also exists as a primitive reflex in infants. [1] While first described in the medical literature by Babinski in 1896, [2] the reflex has been identified in art at least as early as Botticelli's Virgin and Child with an Angel, painted in the mid ...
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The glabellar reflex, also known as the "glabellar tap sign", is a primitive reflex elicited by repetitive tapping of the glabella ...