Urine exits through the external urethral meatus. Urinary causes occur anywhere between the kidney glomerulus and the urethral meatus. The secondary penis had glans but without urinary meatus. Excess tears flow through nasolacrimal duct which drains into the inferior nasal meatus. The external auditory meatus develops from the dorsal portion of the first pharyngeal cleft. Localization of urethral meatus was described in detail. Symptoms of urethral injury include hematuria, blood at the meatus, and dysuria. The openings to the posterior ethmoidal sinuses exist under the superior meatus. Most inhaled airflow travels between the inferior concha and the middle meatus. The maxillary sinus is the largest of the sinuses and drains into the middle meatus. The ethmoid sinuses appear in the fetal fifth month as invaginations of the middle meatus. Below each concha is a corresponding superior, middle, and inferior nasal meatus, or passage. It is located inside the internal auditory meatus. The external auditory meatus (ear canal), which is absent in modern cetaceans, was also present. Unlike modern cetaceans, basilosaurids retained a large external auditory meatus.