NDLI: Grasp-reflex in Human Neonates: Distribution, Sex Difference, Familial Sinistrality, and Testosterone

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Grasp-reflex in Human Neonates: Distribution, Sex Difference, Familial Sinistrality, and Testosterone

Content Provider	Semantic Scholar
Author	Tan, Üner
Copyright Year	2000
Abstract	The palmar grasp-reflex is one of the primitive reflexes observed in neonates. It emerges at around 11 weeks in utero and is inhibited or suppressed at about 2-4 months after birth. The palmar grasp-reflex is due to an inborn coordination of movements, which were described as an instinctive motion allowing a baby to practice grasping and letting go of objects (Lorenz, 1937, 1943). Stirnimann (1941) has argued that the palmar grasp-reflex might be a first expression of a social instinctive behaviour. This reflex is a cutaneo-muscular, polysynaptic reflex, which is elicited by touching the ulnar part of the palm. Characteristically, the thumb comes over and locks the object, then the baby's other fingers lock the object very tightly. One can, in fact, easily visualize the importance of this reflex for grasping mother's hands, arms, and, of course, nipples for nutrition. The palmar grasp-reflex also shares one of the most important functions of the polysynaptic reflexes, i.e., protective action.
Starting Page	63
Ending Page	82
Page Count	20
File Format	PDF HTM / HTML
DOI	10.1007/0-306-46884-0_3
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1007/0-306-46884-0_3
Alternate Webpage(s)	https://doi.org/10.1007/0-306-46884-0_3
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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