SPERMATOGENESIS PRESENTATION

5th week GD presentation .GROUP ( A ). ..embryology..

SPERMATOGENESIS

SPERMATOGENESIS

● Definition : SPERMATOGENESIS is a series of changes by which a male primitive germ cell – the spermatogonia is converted into a spermatozoon. in another words it’s the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis.

● SITE & DURATION :This process takes 64 days to complete and it takes place in the testis and the maturation process begins at puberty.

THE PROCESS OF SPERMATOGENESIS

The process of spermatogenesis can be divided into three phases: 1. Spermatocytosis 2. Meiosis 3. Spermiogenesis

1 Spermatocytosis

• The spermatogonia lie within the seminiferous tubules of the testis. They divide repeatedly by mitotic division to renew themselves

• There are 2 types of spermatogonia: type A and type B. • The type A spermatogonia acts as a stem cell which divides to forms its own and to give rise to type B spermatogonia. • Type B spermatogonia give rise to primary. spermatocytes by simple mitotic division. • The process of spermatocytosis maintains a pool of spermatogonia and gives rise to primary spermatocytes also.

Longitudinal section in the testis

MEIOSIS

Continue To The Meiosis Phase

2 MEIOSIS

MEIOSIS

• The primary spermatocytes divide to form two secondary spermatocytes. This is a reduction division (First meiotic division) wherein the number of chromosomes become half.

MEIOSIS

• Each secondary spermatocyte further divides to form two spermatids by second meiotic division.

• It should be noted that the pair of sex chromosomes (XY) present in the primary spermatocyte becomes separate into X and Y after reduction division resulting into two types of spermatids (having 22 + X and 22 + Y chromosomes).

MEIOSIS

Process of ..SPERMATOGENESIS..

3 SPERMIOGENESIS

• It includes the changes by which a spermatid, which is almost like a circular cell having nucleus, mitochondria, Golgi bodies and centriole, is transformed into a spermatozoon. These changes are as follows:

1. The centriole divides into two parts, the axial filament grows from one while the other forms the annulus (end ring). 2. The nucleus forms head of the spermatozoon and the Golgi bodies covers it forming acrosomal cap. 3. Part of the axial filament (between the head and the annulus) becomes surrounded by the mitochondria forming mitochondrial sheath. 4. Most of the cytoplasm is extruded and the cell membrane remains as a covering of the spermatozoon. 5. Axial filament elongates to form the tail or principal piece

spermatozoon

GALLERY

GROWN SPEARM

SPERMATOGENESIS 2

SPERMATOZOON

SPERMATOGENESIS

2 + 3 + 4 + 5

TS in Seminnferous tubule

TESTIS

Forming

TEAM

This Presentation Was Created By :-

Ahmed Mohammed Abedi

Presented BY :- 1 Ahmed M Hassanein 2 Ahmed M Ibrahim

المشـــاركيــن

احمد محمد عبيدي

احمد محمد ذكي

احمد محمدحسانين

احمد محمد زكريا

احمد محمد عباس

احمد محمد ابراهيم

احــمد محمد احمد1

احمد محمد عبد الباسط

احــمد محمد احمد2

احمد محمد عبد الرحمن

احــمد محمد الراوي

احمد محمد عطية

احمد الفاضل احمد

ابراهيم خالد ابراهيم

احـــــمد محمد عمر

THANK YOU!

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