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Spermatogenesis

 Physiology of the male reproductive system

I). Spermatogenesis

1). walls of the seminiferous tubes continuously dividing

2). The outer layer of cells divide into:

Basement membrane cells

Primary spermatocytes

 

   Meiosis I results in

spermatocyte         spermatocyte

 Meiosis II results in

each spermatid now most undergo

Spermiogenesis

(development of motility)

II). Spermiogenesis

        A).  Sperm learn to swim 

B).  Regions of the sperm

1). Genetic Region: Head

acrosome a lysosome-like structure

2). Metabolic Region: Midpiece

Contains mitochondria

3). Locomotor: Tail

III). Sustentacular Cells

A). From Blood-Testes Barrier

Prevents the antigen from the sperm entering the blood stream

B). Move the sperm into the lumen

C). Supply transport medium

IV). How long does Spermatogenesis take?

V). Hormonal Control of Spermatogenesis and Testosterone Production

(Brain-Testicular Axis)

A).  Mechanism

1). Hypothalamus

(GnRH)

2) Anterior Pituitary 

 (LH)          (FSH)

         

3). Testes

i). LH

Testosterone (Androgen)Þ

	enlargement of the testes
	secondary sex characteristics
	deepening voice
	thickening skin
	enlargement of the muscles

ii). FSH

 bind testosterone Þ

stimulating spermatogenesis