According to Woo (9) metopism is more frequent among whiter & Mongoloids 10%.
But in the present study metopism was observed in 3% which is in sync with earlier studies & it strengthens this hypothesis.
Racial and sexual differences in the frontal curvature and its relation to metopism. American Journal of Physical Anthropology 1949; 7: 215-226.
The first group included skulls without any metopic suture, second group included the skulls with complete metopic suture i.e., metopism and the third group included the skulls with incomplete metopic suture.
Complete metopic suture i.e., metopism was found in 4(3.17%) skulls and incomplete metopic suture was seen in 42 (33.33%) skulls.
It seems that the incidence of metopism is quite low in Australians (1%), Negroids (2%) and Africans (1%) but higher in Europeans (8.7%), Scottish (9.5%), Mongoloids (10%) and Brazilians (7.04%).
Thus it is obvious that the incidence of metopism is gradually on rise in the South Indian states & the state of U.P.
KEY WORDS: Human Anatomy; Metopic suture; Metopism.
It is observed, however, that in some instances this suture persists until an advanced age, after the disappearance of other sutures (Piersol, 1916 apud Agarwal et al., 1979), this being named metopism (Madeira, 1995).
According to the studies of del Sol et al., metopism can be related to varied causes, such as: abnormal growth of the cranial bones, pathologic metopism triggered by hydrocephalus, growth interruption, heredospecific factors, sexual influence, heredity, atavism (emergence of a feature supposedly present in a remote ancestral, as a function of random recombination of genes or environmental conditions favorable to its expression in the embryo), stenocrotaphia (abnormal narrowing of the temporal area of the head), plagiocephaly (cranial malformation causing a twisted and asymmetrical head because of the synostosis of the cranial sutures), scaphocephaly (deformed head, projecting forward like the keel of a boat), mechanical causes and hormonal dysfunction.