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Encyclopedia > Moro reflex

The Moro reflex, also known as the startle reflex, is one of the infantile reflexes. It may be observed in incomplete form in premature birth after the 28th week of gestation, and is usually present in complete form by week 34 (third trimester). It is normally lost by the 6th month of life postpartum. It was discovered and first described by Austrian pediatrician Ernst Moro (1874-1951). (aka Frontal release signs) This article or section is in need of attention from an expert on the subject. ... Premature birth (also known as preterm birth) is defined medically as childbirth occurring earlier than 37 completed weeks of gestation. ... Gestation is the carrying of an embryo or fetus inside a female viviparous animal. ... For the term trimester used in academic settings, see Academic term The human gestation period of approximately 40 weeks between the time of the last menstrual cycle and delivery is traditionally divided into three periods of three months, or trimesters. ... Postnatal (Latin for after birth) is the period beginning immediately after the birth of a child and extending for about six weeks. ... Pediatrics (also spelled paediatrics or pædiatrics) is the branch of medicine that deals with the medical care of infants and children. ... Ernst Moro (b. ...


This reflex is a response to unexpected loud noise or when the infant feels like it is falling. It is believed to be the only unlearned fear in human newborns. The little Albert study used the startle reflex in the famous classical conditioning experiment to make him fear white fuzzy things. A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. ... In common use the word noise means unwanted sound or noise pollution. ... This article or section is in need of attention from an expert on the subject. ... The Little Albert experiment was an experiment showing empirical evidence of classical conditioning. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


The primary significance of this reflex is in evaluating integration of the central nervous system (CNS), since the reflex involves 4 distinct components: A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. ... A diagram showing the CNS: 1. ...

  1. Startle
  2. spreading out the arms (abduction)
  3. unspreading the arms (adduction)
  4. Crying (usually)

Absence of any component (except crying) or any asymmetry in the movements is abnormal, as is persistence of the reflex in older infants, children and adults. However, in individuals with cerebral palsy, persistence and exacerbation of this reflex is common. In anatomy, an arm is one of the upper limbs of a two-legged animal. ... // Introduction The movement of body structures is accomplished by the contraction of muscles. ... // Introduction The movement of body structures is accomplished by the contraction of muscles. ... Cry may refer to: The mammalian behavior that brings about tears Usually an expression of a sad emotion A song, from an album of the same name, released in 2002 by the band Simple Minds A single released in 2002 by American pop artist Mandy Moore This is a disambiguation... Symmetry is a characteristic of geometrical shapes, equations and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. ... A young woman who is 18 years old. ...


The origin of this reflex can be found in that fact that primate infants of our ancestors clung to their mother's fur soon after birth, giving their mother the advantage of having her hands free to forage for food and such. If human babies are falling backward with their head their innate reflex will be to stretch out the arms to grab and cling to their mother. Families 15, See classification A primate (L. prima, first) is any member of the biological order Primates, the group that contains all the species commonly related to the lemurs, monkeys, and apes, with the latter category including humans. ... A dogs fur usually consists of longer, stiffer, guard hairs—which can be straight, wiry, or wavy, and of various lengths, hiding a soft, short-haired undercoat. ... Birth is the process in animals by which an offspring is expelled from the body of its mother. ...


External links

  • Medline Plus: Moro reflex
  • Video of the Moro Reflex by University of Nebraska (Google Video)


Primitive reflexes edit
Galant | Grasp | Moro | Rooting | Stepping | Sucking | Tonic neck

  Results from FactBites:
 
MedlinePlus Medical Encyclopedia: Moro reflex (552 words)
Moro reflex is type of involuntary response that is present at birth.
Absence of the Moro reflex in an infant is abnormal.
Primitive reflexes and postural reactions in the neurodevelopmental examination.
Moro Reflex - Health Centers (557 words)
Moro reflex is type of involuntary response that is present at birth.
Absence of the Moro reflex in an infant is abnormal.
One-sided absence of the Moro reflex suggests the possibility of a fractured clavicle or injury to the brachial plexus, which can occur because of birth trauma.
  More results at FactBites »

 
 

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