sinus hair

In contrast to the sinus hairs that other mammals use to detect water movements, evidence indicates that platypuses use specialized mechanoreceptors on the bill called "push-rods".

In humans these whiskers do not exist but there are still sporadic cases where elements of the associated vibrissal capsular muscles or Sinus hair muscles can be found.

The follicles of whiskers, also known as vibrissae or sinus hairs, and the push rods in monotremes, as published by Proske et al., represent the only other known discrete structures in the skin that combine three mechanoreceptor types.