What is the prostatic urethra?
The prostatic urethra is the portion of the urethra that traverses the prostate. It originates in the region of the bladder neck, courses roughly 2.5 cm inferiorly, and terminates at the membranous urethra.
Do males have membranous urethra?
The membranous urethra or intermediate part of male urethra is the shortest, least dilatable, and, with the exception of the urinary meatus, the narrowest part of the urethra. The male urethra laid open on its anterior (upper) surface. (Membranous part labeled at upper right.)
What are the 3 parts of urethra?
The male urethra can be divided into three sections: the prostatic urethra (the uppermost segment within the prostate), the membranous urethra (the segment within the urethral sphincter), and the spongy urethra (the lowermost and longest section within the penis).
What is the membranous urethra?
The urethra connects the urinary bladder to the body surface. In males the urethra is divided into the membraneous and the penile parts. The membranous urethra contains the colliculus seminalis and receives there the openings of vas deferens, prostate, seminal vesicles and ampullary glands.
Which ducts open into the prostatic urethra?
ejaculatory ducts
The ejaculatory ducts open into the prostatic part of the urethra. The seminal vesicles secrete the bulk of the seminal fluid.
How long is the prostatic urethra?
approximately 3 to 4 cm long
The prostatic urethra is approximately 3 to 4 cm long and begins at the internal orifice at the bladder neck and extends through the prostate to the prostatic apex.
What is bulbar urethra?
The bulbar urethra is a segment of the male urethra that is in between the penile urethra and the membrano-prostatic urethra that typically has a robust blood supply.
What goes through the prostate and opens into the prostatic portion of the urethra?
Each ductus deferens, at the ampulla, joins the duct from the adjacent seminal vesicle (one of the accessory glands) to form a short ejaculatory duct. Each ejaculatory duct passes through the prostate gland and empties into the urethra.
How wide is prostatic urethra?
The male urethra is 8 – 9 mm in diameter. The external meatus is 8 mm in size, but normally appears as a vertical slit. The portion of the urethra immediately behind it, in the glans, is 10 — 11 mm in diameter.
What does bulbar mean?
Definition of bulbar : of or relating to a bulb specifically : involving the medulla oblongata bulbar polio.
Where is a bulbar stricture?
Strictures that happen in the first 1″ to 2″ of the urethra that urine passes through are called posterior strictures. In males, the final 9″ to 10″ of the urethra is called the anterior urethra. The anterior urethra includes: the bulbar urethra (under the scrotum and perineum- the area between the scrotum and anus)
Where does the prostate connect to the urethra?
The transition zone is found on the inside of the gland and is the smallest part of the prostate (about 10%). It surrounds the urethra between the bladder and the upper third of the urethra. The central zone surrounds the transition zone and makes up about one quarter of the prostate’s total mass.