What Is Micro Phallus?
Penis that is of unusually small is known as micro phallus or micro penis. The size is smaller than average i.e. when the penis of a new born child is stretched, it is smaller than the average 1.9 cm.
It is a rare case that occurs in less than 0.6% of the world’s population.
Causes of Micro Phallus
Abnormalities occur due to the complex process of fetal development.
The male and female genitalia cannot be distinguished very early. It is only after the production of hormones that the differences occur and sex organs begin to develop. The clitoris and labia-forming tissues in female change to the penis or scrotum in the male child.
The sex chromosomes i.e. the XX and XY chromosomes and the hormones have a big role to play in the development of genitalia. Some of the causes for the occurrence of micro penis are given below.
There is a deficiency of testosterone after the from the 13th to 42nd week of fetal development. The deficiency and the resultant micro penis may be due to genetic reasons though no gene has been located as such.
Another cause is androgen insensitivity, where the fetus displays insensitivity to the male hormone.
Chromosomal abnormalities like Klinefelter’s syndrome, Down’s syndrome or Turner’s syndrome.