REPRODUCTION. HL. Light Micrograph of Testis. Developing spermatozoa. Leydig cells . Sertoli cells. Germinal epithelium cells. 11.4.1 Micrograph of testis. Seminiferous tubule. Structure Of Seminiferous Tubule.
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a) Basement membrane
b) Germinal epithelium (2n) which divide by mitosis to produceSpermatogonium (2n) which grow and enlarge
d) Primary spermatocytes (4n) go through Meioses I to Secondary Spermatocytes (2n). Secondary Spermatocytes go through Meiosis II to produce spermatids (n)
e) Sertoli cells nourish and allow the spermatids to differentiate to spermatozoa. These are released into the lumen
Stimulates the interstitial cells (Leydig cells) to produce testosterone.
Promotes spermiogenesis (maturation of spermatids into spermatozoa)
The human sperm has a head with a haploid nucleus. Atop the nucleus lies a specialized lysosome called the acrosome. It contains hydrolytic enzymes that will dissolve protective layers around the egg and enable the sperm to enter and fertilize it.
Behind the head is the midpiece, which is packed with mitochondria. These organelles provide the energy needed to move the tail.
Whiplikemiovement of the tail, which is really a long flagellum, propel the sperm through the female reproductive tract.
The small structure allows the
Sperm to swim great distances.