Testes – Male Reproductive Organs

by James Pickering, PhD

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    00:00 So now let's turn our attention to the male reproductive organs.

    00:04 Really, lets start with the testes. We have looked at the testes in some detail when we looked at the inguinal canal and the formation of the inguinal canal and how the testes migrated through the anterior abdominal wall.

    00:19 And now we can see the testes in a bit more detail. We can see a testis her that's been opened up. The various layers that are covering it have been opened up.

    00:28 So if the layers were intact, we would have this diagram here.

    00:32 We can see this membrane that's been removed that is our external spermatic fascia.

    00:38 If you remember deep to the external spermatic fascia we have the cremaster muscle and the cremastera fascia. We can see that here this muscular portion. And if that was removed we then we have the internal spermatic fascia which we can see here.

    00:56 So we have got the external. We have got the cremaster and then we have got this internal spermatic fascia. And on this diagram we can see the internal spermatic fascia just deep to this cremaster. So this this layer that's running around here.

    01:14 These layers are important; because, if you remember they would divide from the inguinal canal as it pass through and the male gamete is produced in the testes.

    01:25 And they run through this spermatic cord via the ductus deferens which is within these spermatic fascial coverings through the inguinal canal. So remember those various layers that form the spermatic cord.

    01:41 As the testes migrated to the scrotum they are enclosed by a peritoneal sac.

    01:49 So small is the pouching of the peritoneum enclose the testes as they migrated down and this is known as the tunica vaginalis.

    01:58 And the tunica vaginalis forming this peritoneal sac, has parietal and visceral layers. So the parietal layer you would imagine lines the inside of the internal spermatic fascia and that's what we can see here.

    02:14 If we look at the testis we can see that here is the internal spermatic fascia and lining the inside of it we have got the parietal layer of tunica vaginalis.

    02:27 The parietal layer of tunica vaginalis.

    02:31 If we then actually look at the surface of the testis we see the surface of the testis is closely associated with this visceral layer.

    02:40 And this runs up alongside the epididymis and it runs alongside the ductus deferens.

    02:47 But again between these visceral and parietal layers this time of the tunica vaginalis, we find a thin film of fluid allowing the testes to move freely.

    02:58 So we can see we have the tunica vaginalis, this visceral layer, tightly adhered to the testes and then a space for some thin layer or fluid and then we have the parietal layer running around the parietal layer.

    03:16 The parietal layer runs on the inside of the internal spermatic fascia.

    03:19 and then we have the cremaster muscle and fascia and the external that form the spermatic cord.

    03:28 If we were to section through the testes we would see we have a whole series of lobules and some section separating these lobules.

    03:36 And these are producing the sperms, producing the male gamete.

    03:42 The actual testicle is covered via a tough membrane and that's known as the tunica albugenia which we can see here.

    03:51 This is deep, this is deep to the visceral layer of the tunica vaginalis, the tunica albuginea.

    03:58 The sperms are generated in these convoluted seminiferous tubules that are running throughout the testes and that's what produces these sperm. They converge to form the rete testis that then passes towards the epididymis and here we can see the epididymis; this large tube that is receiving all of the produced gametes producing... the collection of sperm that are then going to pass the ductus deferens.

    04:32 So these rete testis converge in the epididymis.

    04:38 and then the epididymis descends down from its head.

    04:41 It descends down as the body towards the tail of the epididymis.

    04:45 Notice how you have got the testis and then over the superior pole of the testis we find the head of the epididymis.

    04:51 And then the body extends to the inferior pole of the testis where you find the tail.

    04:58 The tail of the epididymis is then continuous with the vas deferens. And it's the vas deferens that runs within the spermatic cord.

    05:06 to enter the pelvis via the inguinal canal.

    About the Lecture

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

    Included Quiz Questions

    1. Tunica vaginalis
    2. External spermatic fascia
    3. Internal spermatic fascia
    4. Dartos fascia
    5. Cremasteric fascia
    1. Tunica albuginea
    2. External spermatic fascia
    3. Internal spermatic fascia
    4. Cremasteric fascia
    5. Visceral layer of tunica vaginalis
    1. Rete testis
    2. Epididymis
    3. Vas deferens
    4. Ductus deferens
    5. Spermatic cord

    Author of lecture Testes – Male Reproductive Organs

     James Pickering, PhD

    James Pickering, PhD

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