Indifferent external genitalia in a 10-mm embryo (38 days after fertilization; Streeter horizon XVI). Genital tubercle encloses a midline glandular primordium (GL) and two corporal primordia (CO). On the cloacal membrane (arrow), a glandular (elevated) and a corporal portion can be distinguished. Urethral plate is located around the sagittally oriented membrane. Caudally, urethral plate ends as anal hillocks ( A ). Labioscrotal swellings (LS) are located dorsolaterally to the genital tubercle.