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  2. Palmar grasp reflex - Wikipedia

    en.wikipedia.org/wiki/Palmar_grasp_reflex

    Infant grasping adult finger. The palmar grasp reflex (or 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. [1]

  3. Primitive reflexes - Wikipedia

    en.wikipedia.org/wiki/Primitive_reflexes

    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 ]

  4. List of reflexes - Wikipedia

    en.wikipedia.org/wiki/List_of_reflexes

    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.

  5. Frontal release sign - Wikipedia

    en.wikipedia.org/wiki/Frontal_release_sign

    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 ...

  6. Grasp - Wikipedia

    en.wikipedia.org/wiki/Grasp

    For newborns, grasping is a natural reflex. A grasp is an act of taking, holding or seizing firmly with (or as if with) the hand. An example of a grasp is the handshake, wherein two people grasp one of each other's like hands. In zoology particularly, prehensility is the quality of an appendage or organ that has adapted for grasping or holding.

  7. Human vestigiality - Wikipedia

    en.wikipedia.org/wiki/Human_vestigiality

    Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]

  8. Thumb sucking - Wikipedia

    en.wikipedia.org/wiki/Thumb_sucking

    This reflex disappears at about 4 months of age; thumb sucking is not purely an instinctive behavior and therefore can last much longer. [4] Moreover, ultrasound scans have revealed that thumb sucking can start before birth, as early as 15 weeks from conception ; whether this behavior is voluntary or due to random movements of the fetus in the ...

  9. Palmomental reflex - Wikipedia

    en.wikipedia.org/wiki/Palmomental_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 ...