The urethra's structure is specialized for both storage (continence) and voiding (urination).
The is a thin, fibromuscular tube that serves as the final conduit for urine to leave the body from the bladder. While its primary function is common to all, its anatomy and additional roles vary significantly between sexes. Anatomical & Functional Review urethra
: Significantly shorter at about 4 cm (1.5 inches). It is located in front of the vagina and opens at the vestibule. Its primary role is solely the transport of urine. The urethra's structure is specialized for both storage
: Two muscles act as valves. The internal sphincter (involuntary smooth muscle) at the bladder neck maintains passive continence, while the external sphincter (voluntary striated muscle) allows for conscious control over urination. Diagnostic Tools for Evaluation Anatomical & Functional Review : Significantly shorter at
: Approximately 18–22 cm long, it is divided into four main sections: pre-prostatic, prostatic (widest), membranous (narrowest), and spongy/penile (longest). Beyond carrying urine, it is a vital part of the reproductive system , transporting semen during ejaculation.
When medical issues are suspected, healthcare providers use several imaging and physical tests to "look at" or evaluate the urethra: Histology, Male Urethra - StatPearls - NCBI Bookshelf