Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Male Reproductive System Lecture PPT
MALE REPRODUCTIVE
SYSTEM
TESTIS
? Lies outside body cavity in the scrotum.
? Shape-- Ovoid, length-- 5cm, diameter--
2.5cm
? Weight --10-15gm
? Tunica albuginea--white fibrous connective
tissue capsule.
? Tunica vasculosa--highly vascularized
connective tissue below tunica albuginea.
? Mediastinum of testis--formed by dense
connective tissue of tunica albuginea projection
into interior of posterior border of testis.
? Mediastinum of testis--blood vessels, nerves and
ducts of testis enter and leave.
? Connective tissue septa extend between
mediastinum and tunica albuginea and divide it
into 250 compartment called as lobule.
? Each lobule contains 2-3 seminiferous tubule.
? Seminiferous tubule--
? Lined with a stratified epithelium called the
germinal epithelium
? Contains two cell types
? Spermatogenic cells that produce sperm
? Sertoli cells that support and nourish the
developing sperm.
? Leydig cells
--Larger in size (15?20 m)
--Polyhedral in shape
--Secrete hormone testosterone-- responsible
for spermatogenesis and the development of
male secondary sexual characters.
? Straight tubule (Tubuli Recti)--final portion of
seminiferous tubule.
? Rete Testis--anastomosing channel in the
mediastinum that drain straight tubule.
? Efferent ducts--they collect sperm from rete
testis.
? Efferent ducts consists of 12-15 coiled tube that
coalesce to form head of epididymis.
Histology of testis
? Epididymis--
? Efferent ducts fuse to form this, highly coiled tube.
? Parts--Head, body and tail.
? Lining epithelium-- Pseudostratified columnar.
? Tail of epididymis continuous with ductus
deferens.
? Function-- Storage and maturation of sperm.
Epididymis
? Ductus (vas) deferens--
? Thick muscular tube extending from tail of
epididymis to prostatic part of urethra.
? Layers in vas deferens:--
? Mucosa--lining epithelium pseudostratified
columnar with stereocilia.
? Muscle layer--
? Outer-- longitudinal
? Middle-- circular
? Inner-- longitudinal
? Adventitia-- loose areolar tissue
Histology of vas deferens
SEMINAL VESICLE
? Elongated sac like with highly convulated
irregular lumen.
? It joins with ductus deferens form ejaculatory
duct.
? Layers of seminal vesicle:--
? Mucosa-- Thrown into highly complex folds.
? These folds join with each other to form many
crypts and cavities.
? Epithelium-- Pseudostratified columnar
? Muscle layer--
? Inner-- Circular ,
? Outer-- Longitudinal
? Adventitia-- Loose connective tissue.
? Secretes-- Seminal fluid that contains
fructose and prostaglandin and constitute
about 70% of ejaculate.
Histology of seminal vesicle
PROSTATE
? Composed of 20-50 compound tubulo-alveolar
glands.
? Embedded in a framework of fibromuscular tissue.
? Arranged in 3 groups
i)Mucosal
ii)Submucosal
iii)Peripheral zone.
? Histologically the prostate is made of fibromuscular
stroma and parenchyma.
? 1)Stroma (connective tissue framework)
i) Fibromuscular capsule? Enclosing the whole
gland and consist of collagen, elastic and smooth
muscle fibres.
ii) Fibromuscular septa? Divide the gland into
lobule.
? 2)Parenchyma (glandular tissue)
--Consist of large number of branching tubules with
dilated ends.
--They appears as follicles, and lined by simple
columnar epithelium.
--The lumen may contain spherical prostatic
concretions or corpora amylacea
? Amyloid bodies (corpora amylacea)
? Present in lumen of some gland.
? Oval dense bodies of glycoproteins.
? Formed due to condensation of secretory
products, which may become calcified.
? The number of corpora amylacea increase with
age.
Changes in prostate with age
? In childhood
? Small and composed of mainly fibromuscular
stroma and rudimentary ducts.
? At puberty
? Sudden increase in size of gland due to formation
of many follicles.
? During 3rd decade
? Irregular epithelial infolding in the lumen of
follicle.
? During 4th decade
? Size remains constant.
? Infolding disappear.
? Amyloid bodies appear in follicle.
? During 5th decade
? Undergo benign hypertrophy (submucosal
gland)
? Peripheral zone is prone to cancer.
SELF ASSESMENT
MALE REPRODUCTIVE SYSTEM
1. The epithelium lining of epididymis is
(a) Simple columnar
(b) Transitional
(c) Stratified columnar
(d) Pseudostratified columnar
2.How many seminiferous tubules are found in
each testis of an average man?
a. 4-6
b. 40-60
c. 400-600
d. 4000-6000
3.Which cells produce testosterone?
a. Leydig cells
b. Sertoli cells
c. Sustentacular cells
d. None
4.Storage and maturation of sperm occurs in
a. Seminiferous tubule
b. Straight tubule
c. Epididymis
d. Rete Testis
5. Corpora amylacea is seen in:
a. Prostate
b. Seminal vesicle
c. Thymus
d. Testis
6.How many layers of smooth muscle are in the
vas deferens?
a. 1
b. 2
c. 3
d. 4
7.Pair structures are all except
a) Testis
b) Vas deferens
c) Prostate
d) Seminal vesicle
Answers
1. (d) Pseudostratified columnar
2. (c). 400-600
3. (b). Sertoli cells
4. (c). Epididymis
5. (a). Prostate
6. (c). 3
7.(c) Prostate
This post was last modified on 30 November 2021