This document provides tips and instructions for using a PowerPoint presentation on male urethra anatomy. It recommends freely editing and modifying the slides. It also suggests using blank slides to engage students by asking them questions and then showing answers. This active learning approach should be repeated over three revisions for best learning. The presentation can also be used for self-study. Bibliography notes are included at the end.

1. Tips on using my ppt.
1. You can freely download, edit, modify and put your
name etc.
2. Don’t be concerned about number of slides. Half the
slides are blanks except for the title.
3. First show the blank slides (eg. Aetiology ) > Ask
students what they already know about ethology of
today's topic. > Then show next slide which enumerates
aetiologies.
4. At the end rerun the show – show blank> ask questions >
show next slide.
5. This will be an ACTIVE LEARNING SESSION x
three revisions.
6. Good for self study also.
7. See notes for bibliography.

2. Introduction & History.

3. Introduction & History.
• The male urethra is a narrow fibromuscular
tube that conducts urine and semen from
the bladder and ejaculatory ducts,
respectively, to the exterior of the body (see
the image below). Although the male
urethra is a single structure, it is composed
of a heterogeneous series of segments:
prostatic, membranous, and spongy.

4. Introduction & History.
•

5. Embryology

6. Embryology
• The posterior male urethra forms from the
urogenital sinus
• The spongy urethra is formed after the
seventh week by tubularization of the
urethral folds along the urethral groove
under the influence of dihydrotestosterone.
• The most distal portion of the urethra is
likely formed by invagination of an
epithelial tag at the distal end of the genital
tubercle.

7. Parts
• The male urethra originates at the bladder
neck and terminates at the urethral meatus
on the glans penis.
• It is roughly 15-25 cm long in the adult.
• and forms an "S" curve when viewed from a
median sagittal plane in an upright, flaccid
position
•

8. Parts
• Divided into 3 segments on the basis of its
investing structures:
1. Prostatic urethra
2. Membranous urethra
3. Spongy (or penile) urethra.
• The urethra can be separated simply into anterior
and posterior urethra.
• The spongy urethra can be subdivided into fossa
navicularis, pendulous urethra, and bulbous
(bulbar) urethra.
• Finally, the bladder neck, or preprostatic urethra,
can be classified as a distinct part of the urethra

9. Parts
•

10. Parts
•

11. Prostatic urethra

12. Prostatic urethra
• portion of the urethra that traverses the
prostate.
• It originates in the region of the bladder
neck,
• 2.5 cm
• Terminates at the membranous urethra.
• Bordered superiorly by the bladder
• Supported inferiorly by the sphincter
urethrae externus muscle and the perineal
membrane (formerly called the urogenital
diaphragm).

13. Prostatic urethra
• The prostatic urethra is surrounded by an
inner circular layer and an outer
longitudinal layer of smooth muscle
• Proximal part is surrounded by the
involuntary internal sphincter.
• The posterior wall of the prostatic urethra
contains the seminal colliculus, or
verumontanum-opening of the paired
ejaculatory ducts and the prostatic utricle.
• Verumontanum is a crucial landmark in
urethroscopy and transurethral surgery.

14. Membranous urethra

15. Membranous urethra
• From the apex of the prostate to the bulb of
the penis.
• It is invested in the external urethral
sphincter muscle and the perineal
membrane.
• The external urethral sphincter muscle and
the perineal membrane fix the urethra firmly
to the ischial rami and inferior pubic rami,
rendering this portion of the urethra
susceptible to disruption with pelvic
fracture.

16. Penile/Spongy Urethra
• The spongy urethra is the region that spans
the corpus spongiosum of the penis
• It is divided into the pendulous urethra and
the bulbous (or bulbar) urethra.
• The pendulous urethra is invested in the
corpus spongiosum of the penis.

17. Arterial Supply

18. Arterial Supply
• The prostatic urethra is supplied by the inferior
vesical artery,
• The bulbourethral artery supplies the membranous
and bulbar urethra
• pendulous urethra is supplied by the deep penile
artery, a branch of the internal pudendal artery.
• The prostatic and membranous urethra drain to the
obturator and internal iliac nodes.

19. Venous Drainage

20. Venous Drainage
• Corresponds to arteries.

21. Lymphatic Drainage
• The prostatic and membranous urethra drain
to the obturator and internal iliac nodes.
• Lymphatic drainage from the spongy
urethra drains to the deep and superficial
inguinal nodes.

22. Microscopic Anatomy

23. Microscopic Anatomy
• The prostatic urethra is lined with
transitional cell epithelium (urothelium).
• The membranous urethra is lined with
stratified columnar and pseudostratified
epithelium.
• the penile urethra is lined with stratified
columnar and pseudostratified epithelium
with stratified squamous epithelium distally.
• In the glans keratinized stratified squamous
epithelium.

24. Get this ppt in mobile
1. Download Microsoft
PowerPoint from play
store.
2. Open Google assistant
3. Open Google lens.
4. Scan qr code from
next slide.

25. Get this ppt in mobile

26. Get my ppt collection
• https://www.slideshare.net/drpradeeppande/
edit_my_uploads
• https://www.dropbox.com/sh/x600md3cvj8
5woy/AACVMHuQtvHvl_K8ehc3ltkEa?dl
=0
• https://www.facebook.com/doctorpradeeppa
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