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Urethra - Anatomy & Physiology (view source)
Revision as of 15:01, 2 September 2008
, 15:01, 2 September 2008→External Urethral Sphincter
** Note the first 2 combined are called the pelvic portion
** Note the first 2 combined are called the pelvic portion
====External Urethral Sphincter====
==Muscles of the Urethra==
The urethralis muscle runs the entire length of the urethra and forms the external urethral sphincter.
Unlike the internal sphincter the external sphincter is composed of striated muscle fibres which are under the voluntary control of the somatic nervous system. It is often called the '''urethralis''' muscle and runs the entire length of the urethra.
Unlike the internal sphincter the external sphincter is composed of striated muscle fibres which are under the voluntary control of the somatic nervous system. It is often called the '''urethralis''' muscle and runs the entire length of the urethra.
* Innervates the urethral skeletal muscle - external urethral sphincter
* Innervates the urethral skeletal muscle - external urethral sphincter
* Function is to retain urine
* Function is to retain urine
==Blood Supply==
==Blood Supply==
Blood Supply comes from the Urethral Artery
Blood Supply comes from the Urethral Artery