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The inferior ramus of the pubic bone: Insertion: Perineal raphe: Nerve: Sympathetic fibers from T10-L2 through the inferior hypogastric plexus then vesical nervous plexus: Actions: Constricts proximal urethra, maintains urinary continence: Identifiers; Latin: musculus sphincter urethrae internus: TA98: A09.2.03.009 A09.4.02.013: TA2: 3444, 3428 ...
The female or male external sphincter muscle of urethra (sphincter urethrae): located in the deep perineal pouch, at the bladder's distal inferior end in females, and inferior to the prostate (at the level of the membranous urethra) in males. It is a secondary sphincter to control the flow of urine through the urethra.
The internal sphincter, formed by the involuntary smooth muscles lining the bladder neck and urethra, receives its nerve supply by the sympathetic division of the autonomic nervous system. [6] The internal sphincter is present both in males and females. [7] [8] [9]
The bladder also contains β 3 adrenergic receptors, and pharmacological agonists of this receptor are used to treat overactive bladder. The mucosa of the urinary bladder may herniate through the detrusor muscle. [6] This is most often an acquired condition due to high pressure in the urinary bladder, damage, or existing connective tissue ...
They then pass down along the sides of the pelvis and finally curve forward and enter the bladder from its left and right sides at the back of the bladder. [2] The ureters are 1.5–6 mm (0.06–0.24 in) in diameter [ 1 ] and surrounded by a layer of smooth muscle for 1–2 cm (0.4–0.8 in) near their ends just before they enter the bladder.
Bladder location and associated structures in the male. In males, the prostate gland lies outside the opening for the urethra. The middle lobe of the prostate causes an elevation in the mucous membrane behind the internal urethral orifice called the uvula of urinary bladder. The uvula can enlarge when the prostate becomes enlarged.
The pudendal nerve is the main nerve of the perineum. [1]: 274 It is a mixed (motor and sensory) nerve and also conveys sympathetic autonomic fibers.It carries sensation from the external genitalia of both sexes and the skin around the anus and perineum, as well as the motor supply to various pelvic muscles, including the male or female external urethral sphincter and the external anal sphincter.
The vas deferens has a dense sympathetic innervation, [16] making it a useful system for studying sympathetic nerve function and for studying drugs that modify neurotransmission. [7] It has been used: as a bioassay for the discovery of enkephalins, the endogenous opiates. [17] to demonstrate quantal transmission from sympathetic nerve terminals ...