Scientific Reason- Choti on the Male Head

Sushrut rishi, the foremost surgeon of Ayurveda, describes the master sensitive spot on the head as Adhipati Marma, where there is a nexus of all nerves. The shikha protects this spot. Below, in the brain, occurs the Brahmarandhra, where the sushumna (nerve) arrives from the lower part of the body. 

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Scientific Reason- Choti on the Male Head

In Yog, Brahmarandhra is the highest, seventh chakra, with the thousand-petalled lotus. It is the centre of wisdom. The knotted shikhã helps boost this centre and conserve its subtle energy known as ojas.