label: genital tubercle of male
label_lc: genital tubercle of male
description: "The genital tubercle of male (GT) (syn: penis anlage) is a medial swelling seen at the level of the hind limb buds, adjacent to the cloaca and posterior/caudal to the urogenital sinus (UGS). The genital tubercle is separated into male and female, therefore you must know the sex of the embryo. At TS:20, the genital tubercle of male is comprised of genital tubercle mesenchyme of male, urethral plate epithelium of male, skin of genital tubercle of male, the urogenital membrane of male, and developing vasculature of male genital tubercle. The urethral plate epithelium and skin together, where they are in direct contact, are known as the urogenital membrane. After TS:20, the genital tubercle becomes further subdivided. At TS:21 the genital tubercle of male is subdivided into distal genital tubercle of male (TS:21-TS:22) (syn: early glans of male), proximal genital tubercle of male (TS:21-TS:22) and preputial swelling of male. Also contains phallic urethra of male and nerve of male genital tubercle (from TS:22). From TS:23, it is subdivided into glans of male genital tubercle (located distally) and preputial swelling of male (located proximally and becoming prepuce of male at TS:24). Will become the penis at TS:25."