such as "Introduction", "Conclusion"..etc
Fig. 2. Immature spermatids. Nucleus (N) with chromatin distributed in small cords. The nucleus sends finger like projections (*) towards the cytophore. X 14,000
Fig. 3. spermatids morulae. Nuclei (N) with perinuclear cistern collapsed. The cytophore (C) is big. Mitochondria (M), abundant multivesicular bodies (Mb) and rugose endoplasmatic reticulum (ER) are found in the cytophore in this stage. X 8,000
Fig. 4. Cross section of the spermatids nuclei. It its surrounded by a single circlet (arrow) of microtubules that form the manchette. Chromatin appears condensed and forming a peripheric ring joined to the nuclear envelope. Early primary acrosome vesicle (pav) near the Golgi apparatus is observed. X 20,000.
Fig. 5. Longitudinal and cross sections of the immature spermatozoon. Elongated nucleus (N) with the condensed chromatin and surrounded by the perinuclear cistern (arrow). X 30,000.
Fig. 6. In this elongate spermatid the formation of the acrosomic complex is observed, The enlarged primary acrosome vesicle (PAV) is causing protrusion of the plasmatic membranes and is invaginated to form the secondary acrosome vesicle (SAV). The acrosome tube (ST) and the dense granule (DS) are also observed. X 30,000.
Fig. 7. Mature spermatozoon. Detail of the acrosome: primary acrosome vesicle (pav); secondary acrosome vesicle (sav); axial rod (ar); capitulum (ca); acrosome tube (at); secondary tube (st); and nucleus. The nuclear tip is plane. X 40,000.
Fig. 8 a) The elongating mitochondria of the midpiece (M)have aggregated around the longitudinal axis between the nucleus (N) and the distal centriole (dc), wich forms the basal body of the axoneme. X 40,000. b) Cross sections of the midpiece (M), in wich the six mitochondria are around a central axis. X 80,000
Fig. 9. Longitudinal sections of the spermatozoon tail. Central and peripheral microtubules (m) are observed. Dense glycogen granules (gg) are arranged in a linear.
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