Sulcus of glans penis

The sulcus of the glans penis (Coronal sulcus; Balanopreputial sulcus) is a circumferential groove or furrow located at the base of the glans penis that demarcates the glans from the penile shaft. It lies just proximal to the corona, the semi-circular dorsal prominence of the glans, and serves as the anatomical boundary between the glans and the body of the penis.

The difference between of the terms "sulcus of glans penis" and "neck of glans penis" is not clear in medical litterature, for example, the term "Balanopreputial sulcus" is the synonym of these both terms.

In the uncircumcised male, the sulcus is typically covered by the foreskin when the penis is flaccid. It is a clinically significant landmark because it represents the site where the foreskin (prepuce) attaches via the frenulum on the ventral aspect, and it is a region where axial pattern vessels of the dartos fascia anastomose with branches of the dorsal penile artery, forming important collateral circulation.

The sulcus is also notable for its dense sensory innervation; genital end bulbs (corpuscular receptors) are most numerous in the corona and near the frenulum structures immediately adjacent to the sulcus.