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Bladder and Urethra – Male Reproductive Organs

by James Pickering, PhD
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    00:00 Let's continue with the bladder and the urethra.

    00:05 So the bladder is going to receive urine via the two ureters.

    00:09 Urine is being produced by the kidneys, the ureter have descending along the posterior abdominal wall and then they're going to enter into the bladder.

    00:19 Now this view is of a male bladder and actually we are looking at it as if someone is standing behind me.

    00:27 Someone standing behind me and looking through my pelvis into the posterior aspect of the bladder. And the posterior aspect of the bladder has been opened up.

    00:36 So what we can see here is the apex of the bladder that's attaching to the anterior abdominal wall. So the apex is attaching to the anterior abdominal wall just above the pubic symphysis. We can see these nice muscular detrusor muscle fibers forming the wall. We can see the internal surface of the bladder is elevated into these rugae allowing the bladder to be distensible.

    01:05 We can also see that we have this smooth region of the bladder and this is known as the trigone.

    01:11 This is kind of a triangular shaped area that is flat and doesn't contain these rugae and the detrusor muscle. It doesn't really contract and that's a good thing. As when the bladder wants to eject the urine the body of the bladder can contract forcing urine out.

    01:30 If the trigone contracted then the urine within the bladder would just be compressed it wouldn't been ejected.

    01:37 At the apex, these two apices of the trigone here and here we see an opening for the two ureters we see the ureteral orifice.

    01:46 And then this trigone take us down into the urethra and here we can see the urethra. Now in the male the urethra passes through the prostate gland and we can see the prostate gland surrounding the urethra and this will be the prostatic part of the urethra.

    02:07 So we can see the bladder is storing the urine and then when its comes to being ejected with micturition so the urine passes through the urethra. We can see on this diagram here, the urine is going to pass through the urethra which is at level of the prostrate and then its going to pass through the penis.

    02:27 So we can see with the notes now alongside the diagram that the bladder has an apex. It has a body, has a fundus and then it take us down into this neck here.

    02:40 So we can see the neck of the bladder here and we can see the trigone.

    02:44 We can see the apex up here. We can see a nice body along the superior surface and then the fundus this posterior aspect of the bladder.

    02:57 We can see we have got a nice detrusor muscle allowing the muscle to constrict tightly.

    03:01 It's got four surfaces, the bladder. It's got this superior surface and then its going to have two inferolateral surfaces that converge much like a front of a boat.

    03:14 The inferolateral surfaces that converge and form the apex.

    03:19 And then you have got the superior surface here.

    03:21 We will then find posteriorly, near the fundus, this posterior surface.

    03:28 The bladder neck, as I said, tapers and we have found the urethra orifice and urine passes through this internal urethra orifice.

    03:36 and it enters into the prostatic part of urethra.

    03:41 The internal urethral orifice marks the beginning of the urethra.

    03:45 And like I said this initially passes through the prostrate. But it exits the pelvis by entering into the base of the penis. And here we can see we have various parts of our urethra passing through the penis.

    04:00 We can see we have this what's called intramural urethra or this preprostatic part.

    04:05 That's just the portion by the neck of the bladder before it's got into the prostrate.

    04:10 We then have a prostatic urethra which is important. As this is where semen from the seminal vesicles and sperms from the testes can enter into ureter for ejaculation.

    04:24 So here we have the prostatic urethra We then have a portion of the urethra called the membranous part and this passes through the pelvic diaphragm.

    04:33 As it's leaving the pelvic and entering the perineum because the actual penis itself is found within the perineum.

    04:42 And urethra running through the penis is known as the spongy urethra.

    04:46 As it running through a rectal tissue called corpus spongiosum.

    04:52 So four parts to the penis.

    04:54 A intramural or pre-prostatic part. A prostatic part that runs through the prostate.

    05:00 A membranous part that passes through the pelvic diaphragm. And a spongy part that runs through the corpus spongiosum.


    About the Lecture

    The lecture Bladder and Urethra – Male Reproductive Organs by James Pickering, PhD is from the course Pelvis.


    Included Quiz Questions

    1. Membranous urethra
    2. Prostatic urethra
    3. Pre-prostatic urethra
    4. Spongy urethra
    5. Bulbar urethra
    1. Internal urethral orifice
    2. Trigone
    3. Membranous urethra
    4. Prostatic urethra
    5. External urethral orifice
    1. Superior
    2. Posterior
    3. Inferior
    4. Lateral
    5. Anterior

    Author of lecture Bladder and Urethra – Male Reproductive Organs

     James Pickering, PhD

    James Pickering, PhD


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    Good
    By karlos k. on 25. February 2018 for Bladder and Urethra – Male Reproductive Organs

    Well explained dr,now i understand better, i liked this class very much

     
    farily bad
    By EDUARDO H. on 28. December 2017 for Bladder and Urethra – Male Reproductive Organs

    multiply things go unexplained... for example, he did not even explain what is the pelvic floor, or what is the pelvic diaphragm, but he quoted it several times.... bad class