The document describes the anatomy and histology of the male reproductive system. It discusses the components, characteristics, functions, and histopathological lesions of the seminiferous tubules, epididymis, vas deferens, and prostate. The seminiferous tubules contain spermatogenic cells that produce sperm and Sertoli cells, as well as Leydig cells that produce testosterone. The epididymis functions in sperm storage and maturation. The vas deferens transports sperm via peristalsis. The prostate secretes enzymes and can develop conditions like benign prostatic hyperplasia or prostatitis.

1. @OSAMA_Z96

2. 1- Seminiferous tubules
(Testis of adult)
* Component & Characteristics :
1- Myofibroblast (Myoid cells).
2- Tunica vaginalis.
3- Tunica albuginea.
4- Tunica vasculosa.
5- Interstitial cells of Leydig.
6- Sertoli cell.
7- Spermatogenic cells.
8- Sperms.
* Function :
1- Spermatogenic cells :
Sperms production.
2- Leydig :
Testosterone production.
* Histopathological Lesion :
1- Embryonal carcinoma.
2- Seminoma.

4. 2- Seminiferous tubules
& Spermatogenic cells
* Component & Characteristics :
1- Interstitial cells of Leydig.
2- Spermatogonia (Dark).
3- Primary spermatocyte (Biggest cell).
4- Spermatids.
5- Mature sperms.
* Function :
1- Spermatogenic cells :
Sperms production.
2- Leydig :
Testosterone production.
* Histopathological Lesion :
1- Embryonal carcinoma.
2- Seminoma.

6. 3- Epididymis
* Component & Characteristics :
1- Fibromuscular capsule.
2- Pseudostratified columnar with long stereo cilia.
3- Epididymal ductules.
4- Mature sperms.
* Function :
- Storage & Start of sperms motility (capacitation).
* Histopathological Lesion :
1- Epididymitis.
2- Epididymal adenomatoid.

8. 4- Vas deferens (Ductus deferens)
* Component & Characteristics :
1- Musculosa (3 Layers) :
A) Longitudinal layer (In & Out).
B) Circular layer (Middle).
C) Muscle fibers.
2- Mucosa :
With few stereocilia pseudostratified
columnar epithelium (or simple columnar).
* Function :
- Peristalsis of vas deferens propulse the sperms.
* Histopathological Lesion :
1- Congenital absence of the vas deferens.
2- Leiomyoma of vas deferens.

10. 5- Prostate
* Component & Characteristics :
1- Tubuloacinar glands :
A) Psedostratified (or simple) columnar epithelium.
B) Simple low columnar epithelium.
2- Prostatic secretion.
3- Fibromuscular septa.
4- Blood vessels.
5- Corpora amylacea (concretions).
* Function :
- Secretion of clotting & fibrinolysin enzymes.
* Histopathological Lesion :
1- Benign prostatic hyperplasia.
2- Prostatitis.