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Ureter, 5. Urinary bladder, 6. ... apart and about the same distance from the internal urethral orifice; ... Image from Gray's Anatomy 1918 edition. ...
The trigone (also known as the vesical trigone) [1] is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice. The area is very sensitive to expansion and once stretched to a certain degree, stretch receptors in the urinary bladder signal the brain of its need to empty ...
The urinary meatus [a] (/ m iː ˈ eɪ t ə s /, mee-AY-təs; pl.: meati or meatuses), also known as the external urethral orifice, is the opening of the penis or vulva where urine exits the urethra during urination. It is also where semen exits during male ejaculation, and other fluids during female ejaculation. The meatus has varying degrees ...
The anatomy of the human urinary system differs between males and females at the level of the urinary bladder. In males, the urethra begins at the internal urethral orifice in the trigone of the bladder, continues through the external urethral orifice, and then becomes the prostatic, membranous, bulbar, and penile urethra.
The neck of the bladder is the area at the base of the trigone that surrounds the internal urethral orifice that leads to the urethra. [5] In males, the neck of the urinary bladder is next to the prostate gland. The bladder has three openings. The two ureters enter the bladder at ureteric orifices, and the urethra enters at the trigone of the ...
The external urethral sphincter is a striated muscle that allows voluntary control over urination. [5] 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 ]
At the summit of the glans is the slit-like vertical opening known as the external urethral orifice, or the urinary meatus. The circumference of the base of the glans forms a rounded projecting border, the corona of glans penis, overhanging a deep retroglandular sulcus, behind which is the neck of the penis.
The two Skene's ducts lead from the Skene's glands to the vulvar vestibule, to the left and right of the urethral opening, from which they are structurally capable of secreting fluid. [2] [3] Although there remains debate about the function of the Skene's glands, one purpose is to secrete a fluid that helps lubricate the urethral opening. [2] [3]