-
Spermatogenesis
Posted on February 14, 2013 via with 163 notes
-
![(A) Steps of spermatid differentiation: (1) Immature spermatid with round shaped nucleus. The acrosome vesicle is attached to the nucleus, the tail anlage fails contact to the nucleus. (2) The acrosome vesicle is increazed and flattened over the nucleus. The tail contacted the nucleus. (3–8) Acrosome formation, nuclear condensation and development of tail structures take place. The mature spermatid (8) is delivered from the germinal epithelium. Semi-schematic drawing on the basis of electron micrographs. From Ref. [14]. (B) Development of a giant spermatid by confluence of double headed spermatids of a clone. The giant spermatid remains in contact with the Sertoli cell. Drawing on the basis of electron micrographs. (C) Differentiation of acrosomeless spermatozoa. The nuclear condensation and the development of tail structures is not disturbed. The acrosome, however, fails to establish contact to the nucleus of the spermatid and remains in the Sertoli cell cytoplasm. Drawing on the basis of electron micrographs.
Understanding spermatogenesis is a prerequisite for treatment. Adolf-Friedrich Holstein, Wolfgang Schulze and Michail Davidoff. Reprod Biol Endocrinol. 2003; 1: 107.](http://25.media.tumblr.com/14d6f47ffc68c072b36d81f2cbea68aa/tumblr_mhic7aJ7SJ1qgzqeto1_500.jpg)
(A) Steps of spermatid differentiation: (1) Immature spermatid with round shaped nucleus. The acrosome vesicle is attached to the nucleus, the tail anlage fails contact to the nucleus. (2) The acrosome vesicle is increazed and flattened over the nucleus. The tail contacted the nucleus. (3–8) Acrosome formation, nuclear condensation and development of tail structures take place. The mature spermatid (8) is delivered from the germinal epithelium. Semi-schematic drawing on the basis of electron micrographs. From Ref. [14]. (B) Development of a giant spermatid by confluence of double headed spermatids of a clone. The giant spermatid remains in contact with the Sertoli cell. Drawing on the basis of electron micrographs. (C) Differentiation of acrosomeless spermatozoa. The nuclear condensation and the development of tail structures is not disturbed. The acrosome, however, fails to establish contact to the nucleus of the spermatid and remains in the Sertoli cell cytoplasm. Drawing on the basis of electron micrographs.
-
(A) Microvasculature of the intertubular space. Co-cells encase the capillaries, Leydig cells and the seminiferous tubule. (B) The human spermatozoon. (1) Light microscopical aspect, (2) Virtual preparation of the spermatozoon showing the acrosome, the nucleus and nuclear envelopes, the mitochondrial sheath of the main piece of the flagellum, (3–11) Cross sections of the human spermatozoon of different levels indicated in (12) longitudinal section of the human spermatozoon. Semi-schematic drawing on the basis of electron micrographs.
-
‘Sector of the germinal epithelium in the seminiferous tubule. Drawing on the basis of a semithin section. × 900 (B) Sertoli cells divide the germinal epithelium in a basal and adluminal compartment. Arrows indicate the transport of substances only to the basal compartment, via the Sertoli cell into the adluminal compartment, via the Sertoli cell into the lumen.’
-
‘Cross-section of the human testis. Drawing of a paraffin section. × 2.5. (B) Arrangement of the seminiferous tubules in the human testis and of the excurrent ductular system of the epididymis. Semi-schematic drawing. (C) Cross section of a seminiferous tubule of a fertile man 32 years of age. Drawing of a semithin section. × 300.’
-
Human spermatogenesis
From: Human Microscopic Anatomy: An Atlas for Students of Medicine and Biology by Radivoj V. Krstic
-
“Intrinsic regulation of gametogensis. On the left a section of the germinal epithelium with basal lamina propria and below a cluster of Leydig cells surrounding a capillary are outlined. Arrows indicate different influences of secreted hormones and growth factors. On the right the main processes of spermatogenesis are correlated to regulatory processes.”
