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Voiding urine begins with voluntary relaxation of the external urethral sphincter. This is facilitated by inhibition of the somatic neurons in Onuf's nucleus via signals arising in the
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at Human
Anatomy Online, SUNY Downstate Medical Center - "Muscles of the female urogenital diaphragm (deep perineal pouch) and structures located inferior to it."
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Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Region visible, but muscle not labeled.)
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glands, pass around the urethra, and behind it unite with the muscle of the opposite side, by means of a tendinous
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The male urethra laid open on its anterior (upper) surface. (Region visible, but muscle not labeled.)
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musculus sphincter urethrae externus urethrae masculinae, musculus sphincter urethrae membranaceae
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249:. The external sphincter muscle prevents urine leakage as the muscle is tonically contracted via
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Shah AP, Mevcha A, Wilby D, Alatsatianos A, Hardman JC, Jacques S, Wilton JC (November 2014).
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Knowledge (XXG) articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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Its innermost fibers form a continuous circular investment for the membranous urethra.
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280:. During ejaculation, the external sphincter opens and the internal sphincter closes.
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to the extent of 1.25 to 2 cm., and from the neighboring fascia.
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369:"Clinical and Functional Anatomy of the Urethral Sphincter"
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203:Its external fibers arise from the junction of the
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418:"Continence and micturition: An anatomical basis"
101:Constricts urethra, maintains urinary continence
214:They arch across the front of the urethra and
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178:external sphincter muscle of the male urethra
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472:Proceedings of the Royal Society of Medicine
367:Jung J, Ahn HK, and Huh Y (September 2012).
314:External sphincter muscle of female urethra
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19:Sphincter urethrae membranaceae muscle
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58:Junction of the inferior rami of the
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188:, surrounds the whole length of the
1177:. You can help Knowledge (XXG) by
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88:Somatic fibers from S2-S4 through
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466:J. B. Macalpine (November 1934).
297:Right hip bone. Internal surface.
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278:descending reticulospinal tracts
182:sphincter urethrae membranaceae
899:Extraglomerular mesangial cell
779:Intraglomerular mesangial cell
245:which is under control of the
66:to the extent of 1.25 to 2 cm.
1:
1112:This article related to the
759:Glomerular basement membrane
348:of the 20th edition of
319:Internal urethral sphincter
243:internal urethral sphincter
186:sphincter urethrae externus
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1239:Genitourinary system stubs
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1099:
797:Proximal convoluted tubule
484:10.1177/003591573402800112
276:and traveling through the
274:pontine micturition center
233:The muscle helps maintain
160:Anatomical terms of muscle
992:Internal urethral orifice
969:Median umbilical ligament
876:Juxtaglomerular apparatus
385:10.5213/inj.2012.16.3.102
253:fibers that originate in
192:, and is enclosed in the
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824:Distal convoluted tubule
519:Anatomy figure: 41:06-04
247:autonomic nervous system
700:Peritubular capillaries
925:Ureteropelvic junction
829:Collecting duct system
612:medullary interstitium
889:Juxtaglomerular cells
1114:genitourinary system
259:sacral spinal nerves
205:inferior pubic ramus
198:urogenital diaphragm
1052:Lacunae of Morgagni
997:Urethral sphincters
190:membranous urethra
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834:Connecting tubule
324:Prostatic urethra
284:Additional images
257:and pass through
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431:(8): 1275–1283.
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77:Ischiopubic rami
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629:Cortical lobule
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1234:Male urethra
1179:expanding it
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1037:intermediate
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942:Circulation
884:Macula densa
866:Renal pelvis
789:Renal tubule
680:interlobular
660:Renal artery
478:(1): 39–56.
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861:Major calyx
856:Minor calyx
649:Circulation
309:Levator ani
106:Identifiers
1218:Categories
807:Descending
749:Glomerulus
715:interlobar
705:Vasa recta
695:Renal vein
670:interlobar
425:Clin. Anat
330:References
235:continence
1032:prostatic
1001:External
894:Mesangium
774:Mesangium
665:segmental
656:Arteries
72:Insertion
1017:Internal
958:(female)
764:Podocyte
720:efferent
685:afferent
607:pyramids
502:19990023
453:21875132
445:24615792
403:23094214
346:page 429
303:See also
229:Function
1091:Anatomy
984:Urethra
974:Trigone
935:Bladder
917:Ureters
732:Nephron
710:arcuate
675:arcuate
639:Nephron
602:Medulla
585:Capsule
565:Kidneys
493:2205523
394:3469827
267:synapse
251:somatic
209:ischium
196:of the
180:, also
97:Actions
64:ischium
48:Details
1171:muscle
1077:Portal
1042:spongy
1010:female
691:Veins
595:column
590:Cortex
580:Fascia
573:Layers
500:
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354:(1918)
194:fascia
54:Origin
1169:This
1116:is a
619:Sinus
449:S2CID
421:(PDF)
344:from
239:urine
220:raphe
164:[
153:19733
112:Latin
84:Nerve
60:pubis
1175:stub
1118:stub
1005:male
624:Lobe
498:PMID
441:PMID
399:PMID
207:and
176:The
141:2421
124:TA98
62:and
488:PMC
480:doi
433:doi
389:PMC
381:doi
265:to
237:of
148:FMA
136:TA2
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
