Sexual stimulation.
There are no "glans" in the human head. The "glans" is found on the human penis or clitoris.
The glans penis
Yes. The foreskin or prepuce covers the glans penis. or at least is usualy does when the penis is flacid, sometimes they may be short showing more or less of the glans at all times.
The scientific term for the head of the penis is "glans penis."
The male that has fallen victim to circumcision has no skin on his penis that can cover the glans at the top. The male with an intact penis will have a tube of skin that covers the glans penis, particularly when it is not erect.
A man with intact genitals has a retractable skin that covers and protects the glans penis. A man that is incomplete (circumcised) has a fully exposed glans penis.
The underside
The doctor can fix that.
The glans are a very fine and sensitive part of the penis when the glans are exposed it will react. it is designed to be protected by the foreskin
Balanitis is an inflammation of the glans (the rounded head) of the penis.
glans penis
vagina