The Male Reproductive System I

Histology:2nd stage Dr. Raja Ali
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The Male Reproductive System I


Testes
SeminiferoTuusb ules
Spermatogenesis
The Clonal Nature of Male Germ Cells
Spermiogenesis
Sertoli Cells
Interstitial Tissue
Intra-testicular Ducts
Excretory Genital Ducts
Accessory Glands
Penis

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• The male reproductive system is composed of the testes ,genital ducts, accessory glands ,and penis .
• Testes function in the production of hormones and spermatozoa. Testosterone is the main hormone produced in the testes .
• Testosterone is important for spermatogenesis, sexual differentiation during embryonic and fetal development, and control of gonadotropin secretion. Dihydrotestosterone acts on many organs and tissues of the body during pubety and adulthood (eg , muscle, hair pattern, and hair growth.
• The genital ducts and accessory glands produce secretions and aided by smooth muscle contractions, propel spermatozoa toward the exterior.
• These secretions also provide nutrients for spermatozoa while they are confined to the male reproductive tract.
• Spermatozoa and the secretions of the genital ducts and Accessory glands make up the semen ,which is introduced into the female reproductive tract through the penis.

Testes:
• Each testis (testicle) is surrounded by a capsule of dense connective tissue, the tunica albuginea , is thickened on the posterior side of the testis to form the mediastinum testis, from which fibrous septa penetrate the organ and divide it into about 250 pyramidal compartments or testicular lobules (fig.1).
• The septa are incomplete, and there is intercommunication between lobules. Each lobule is occupied by one to four seminiferous tubules that are surrounded by interstitial loose connective tissue rich in blood and lymphatic vessels, nerves, and endocrine interstitial cells(Leydig cells) which secrete testosterone .