Reflex of Moro

The reflex of Moro , known as Reflex of defense , is one of the infantile reflexes. It can be observed in incomplete form at the premature after the 28^ème week of the Gestation (6 months), and is usually present in complete form at the 34^ème week (third quarters: 7,5 months). It is normally lost as of the third month after the birth, for the period Postnatale. He was discovered and described the first time by the Pédiatre Autrichien Ernst Moro (1874-1951).

This reflex is an answer to a extremely unexpected Bruit or when the infant feels to fall. It is thought that it is only the innate Peur at the human one.

The original intention start this reflex is the evaluation of the central nervous system. The child placed on the back is raised by the hands of a few centimetres, upper limbs in extension. The reflex appears when it falls down within examination; it breaks up into four parts

fear
Abduction of the arms
Adduction of the arms
cry S

The absence of one of these reactions (except the cry) or an asymmetry in the movements is abnormal, as well as the persistence of the reflex in the older children and the adults. However the persistence and the exacerbation of the reflex at the people victims of cerebral Paralysie are common.

The origin of this reflex can be explained by the fact that our ancestors Primate S clutched the Fourrure of their mother after their Naissance, thus making it possible the Mère to have the freehands. If a baby falls behind, its first reflex will be of tightening the arms to catch his/her mother ahead.

Sources

External links

various stages of psychomotor development from 0 to 6 years
Medline More: Reflex Moro
of the reflex of Moro by the University of Nabraska (Google Video)
Pathologic Moro Reflex camera following acute demyelinating lesion off unknown origin in medulla oblongata (Neurology)

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