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<em><strong>Fig. 1.</strong> a) Spermatocytes morulae with rounded nucleus and partially condensed chromatin. Mitochondria (M) and Golgi apparatus (G) are observed in the cytoplasm. X.6,000. b) Spermatocytes nuclei (N) with the perinuclear cistern normally dilated. These cells are attached to the cytophore by cytoplasmatic bridges (arrow). X 12,000</em> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f01.JPG" alt="ultrastructural%20study%20f01.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 2.</strong> Immature spermatids. Nucleus (N) with chromatin distributed in small cords. The nucleus sends finger like projections (*) towards the cytophore. X 14,000</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f02.JPG" alt="ultrastructural%20study%20f02.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 3.</strong> 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</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f03.JPG" alt="ultrastructural%20study%20f03.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 4.</strong> 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.</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f04.JPG" alt="ultrastructural%20study%20f04.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 5.</strong> 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.</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f05.JPG" alt="ultrastructural%20study%20f05.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 6.</strong> 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.</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f06.JPG" alt="ultrastructural%20study%20f06.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 7.</strong> 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.</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f07.JPG" alt="ultrastructural%20study%20f07.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 8</strong> 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</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f08.JPG" alt="ultrastructural%20study%20f08.JPG"></em> </p> <p> </p> <p> </p> <hr><p> </p> <p> <em><strong>Fig. 9.</strong> Longitudinal sections of the spermatozoon tail. Central and peripheral microtubules (m) are observed. Dense glycogen granules (gg) are arranged in a linear.</em> </p> <p> <em><img src="http://www.biology-online.org/user_files/Image/Physiology/ultrastructural%20study%20f09.JPG" alt="ultrastructural%20study%20f09.JPG"></em> </p> <p> <em><br></em> </p> <p> <em></em> </p>
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