Definition: The term "manubrial" refers to a type of organ or tissue found in the lining of the urethra, which is the tube that carries urine from the bladder to the penis. The manubrial is located just below the surface of the urethra, and it helps to protect the urethra by preventing it from contracting during urination. Additionally, the manubrial also plays a role in regulating the flow of urine through the body.