Definitions

furrowed tongue

Minor physical anomalies

Minor physical anomalies (MPAs) are relatively minor (typically painless and, in themselves, harmless) congenital physical abnormalities consisting of features such as low-seated ears, adherent ear lobes, and a furrowed tongue. While MPAs may have a genetic basis, they might also be caused by factors in the fetal environment: anoxia, bleeding, or infection. MPAs have been linked to disorders of pregnancy and are thought by some to be a marker for insults to the fetal neural development towards the end of the first trimester. Thus, in the neurodevelopmental literature, they are seen as indirect indications of inferferences with brain development. In studies of children and adolescents with conduct problems, such markers have been linked to some extent to impulsivity and aggressiveness.

MPAs have been studied in autism and in schizophrenia. A 2008 meta-analysis found that MPAs are significantly increased in the autistic population. A 1998 study found that 60% of its schizophrenic sample and 38% of their siblings had 6 or more minor physical anomalies (especially in the craniofacial area), while only 5% of the control group showed that many.

Some Minor Physical Anomalies related to schizophrenia have a hypoxic contribution to their formation.

These anomalies are thought to reflect changes in the brain as both are derived from the ectoderm.

Several minor physical anomalies are attributable in part by hypoxia. The most often cited minor physical anomaly: high arched palate, is described in articles as a microform of a cleft palate, The vaulted palate caused by nasal obstruction and consequent mouth breathing, without the lateralising effect of the tongue can produce hypoxia at night but is not reported as contributing to schizophrenia.

Other malformations are reported only sporadically. Capillary Malformation is induced by RASA1 mutation and can be changed by hypoxia: A study in the American Journal of Psychiatry by Trixler et al: found hemangiomas to be highly significant in schizophrenia, and one of the authors said hemangiomas would include any birthmark which hadn't faded by adulthood - as this was suspected as abnormal (although he added the correlation wasn't high)(Pers. Comm). Exotropia is reported as having low correlation and high significance as well. It can be caused by perinatal hypoxia:

References

Further reading

  • Habel, A, Elhadt, N, Sommerlad, B, Powell, J (2005) 'Delayed detection of cleft palate: an audit of newborn examination', Archive of Diseases in Childhood, 91, p238.

Psychiatry, V 155, Iss 12.

  • Raine, A. (2002). Annotation: The role of prefrontal deficits, low autonomic arousal, and early health factors in the development of antisocial and aggressive behavior in children. Journal of Child Psychology and Psychiatry, 43(4), 417-434.
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