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137 results for “Spermatozoa”
Fig. 4. Mylossoma duriventre spermatozoa. A in Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus
Fig. 4. Mylossoma duriventre spermatozoa. A - Spermatozoa in longitudinal section. B and C - Longitudinal sections of the nuclear fossa region. D - Midpiece in longitudinal section. E to H - Midpiece in cross sections. I - Flagellum in longitudinal section. J and K - Flagella in cross sections. Scale bars, A = 0.55 µm; B = 0.6 µm; C = 0.35 µm; D = 0.6 µm; E - F = 0.45 µm; G = 0.35 µm; H = 0.4 µm; I = 0.5 µm; J = 0.3 µm; K = 0.25 µm. A: axoneme; D: distal centriole; F: flagellum; M: mitochondria; N: nucleus; P: proximal centriole; V: vesicle; Asterisk: fins; Arrow: electron dense material; Arrowhead: cytoplasmic canal; Double arrow: nuclear fossa; Star: cytoplasmic sleeve.
Fig. 3. Serrasalmus maculatus spermatozoa. A in Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus
Fig. 3. Serrasalmus maculatus spermatozoa. A - Spermatozoa in longitudinal section. B - Flagellum in longitudinal section. C - Longitudinal section of the nucleus at the nuclear fossa region. D to J - Cross sections in different levels of midpiece. K and L - Flagella in cross sections. Note the vesicles in the initial segment of the flagella. Scale bars A = 0.5 µm; A/Inset = 0.2 µm; B- C = 0.45 µm; D = 0.7 µm; E and F = 0.4 µm; G = 0.5 µm; H and I = 0.55 µm; J = 0.4 µm; K = 0.35 µm; L = 0.6 µm. A: axoneme; C: centriole; D: distal centriole; F: flagellum; M: mitochondria; N: nucleus; P: proximal centriole; V: vesicle; Asterisk: fins; Arrow: electron dense material; Arrowhead: cytoplasmic canal; Double arrow: nuclear fossa; Star: cytoplasmic sleeve.
Fig. 1. Serrasalmus maculatus spermiogenesis. A in Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus
Fig. 1. Serrasalmus maculatus spermiogenesis. A to C - Longitudinal sections of early spermatids during the nuclear rotation process. D and E - Longitudinal sections of early spermatids during the chromatin condensation process. F, G and J - Midpiece cross sections. H and I - Flagella in cross sections. Scale bars: A to C = 1 µm; D = 0.85 µm; E = 0.9 µm; F = 0.9 µm; G = 0.75 µm; H = 0.04 µm; I = 0.75 µm; J = 0.6 µm. A: axoneme; C: centriole complex; D: distal centriole; F: flagellum; M: mitochondria; N: nucleus; P: proximal centriole; V: vesicle; Asterisk: fins; Arrow: electron dense material; Arrowhead: cytoplasmic canal; Double arrow: nuclear fossa.
Fig. 2. Piaractus mesopotamicus spermatozoa. A in Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus
Fig. 2. Piaractus mesopotamicus spermatozoa. A - Longitudinal section of a spermatozoon. A/Inset - Cross section of the midpiece at the cytoplasmic sleeve region. B and C - Longitudinal sections of the nucleus at the nuclear fossa region. D - Cross sections of the nucleus at the nuclear fossa region. E and F - Cross sections in different levels of the midpiece. G and H - Longitudinal and cross sections of the flagellum. Scale bars, A = 0.45 µm; A/inset = 0,15 µm; B and C = 0.4 µm; D = 0.35 µm; E = 0.3 µm; F = 0.25 µm; G = 0.3 µm; H = 0.15 µm. A: axoneme; C: centriole; D: distal centriole; F: flagellum; M: mitochondria; N: nucleus; P: proximal centriole; Asterisk: fins; Arrow: electron dense material; Arrowhead: cytoplasmic canal; Double arrow: nuclear fossa; Star: cytoplasmic sleeve.
Fig. 4. Microglanis aff. parahybae spermatozoa. A in Comparative description and discussion of spermiogenesis and spermatozoal ultrastructure in some species of Heptapteridae and Pseudopimelodidae (Teleostei: Siluriformes)
Fig. 4. Microglanis aff. parahybae spermatozoa. A: longitudinal section. A: X 9800. B: nucleus in cross section. B: X 17000. C: longitudinal sectional of the head and initial midpiece region. C: X 23000. D-E: midpieces in longitudinal sections. D: X 31500; E: X 21500. Insert: proximal centriole. X 59000. F: midpiece in cross sections. F: X 17000. C: centriolar complex; F: flagellum; H: head; M: mitochondria; MP: midpiece; N: nucleus; V: vesicle; arrow: cytoplasmic channel; asterisks: nuclear fossa.
Fig. 6. Pimelodella gracilis spermatozoa. A in Comparative description and discussion of spermiogenesis and spermatozoal ultrastructure in some species of Heptapteridae and Pseudopimelodidae (Teleostei: Siluriformes)
Fig. 6. Pimelodella gracilis spermatozoa. A: longitudinal section. A: X 21000. B: nucleus in cross section. B: X 21000. C, E: midpiece in longitudinal sections. C: X 20300; E: X 25200. D, F,G: midpieces in cross sections. D: X 29700; F: X 29400; G: X 29000. H: flagella in cross and longitudinal sections. H: X 25200. C: centriolar complex; F: flagellum; H: head; M: mitochondria; MP: midpiece; N: nucleus; V: vesicle.
Fig. 5. Potamorhina altamazonica spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 5. Potamorhina altamazonica spermatozoa. a: spermatozoon longitudinal section, X 13600; b: centriolar complex, X 25500; c - g: midpiece cross sections; c and d, X 23000; e and f, X 25200; g, X 15900; h: midpiece and flagellum longitudinal section, X 17500; i and j: flagella cross-sections; i, X 42000; j, X 37800. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubule doublets; F: flagellum; HE: head; M: mitochondria; MC: membranous compartment; MP: midpiece; N: nucleus; NE: nuclear envelop; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; asterisks: anchorage fibrils; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.
Fig. 3. Cyphocharax gillii spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 3. Cyphocharax gillii spermatozoa. a: spermatozoon longitudinal section, X 13800; b: centriolar complex, X 34600; c- f: midpiece cross sections; c, X 22100; d, X 23000; e, X 23500; f, X 22000; g: flagella longitudinal sections, X 23000; h: flagella cross section, X 28900. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubule doublets; F: flagellum; HE: head; M: mitochondrion; MC: membranous compartment; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.
Fig. 2. Cyphocharax modestus spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 2. Cyphocharax modestus spermatozoa. a: spermatozoon longitudinal section, X 13000; b - g: midpiece cross sections; b, X 18000; c, X19300; d – f, X 22000; g, X 33700; h: midpiece longitudinal section, X 21000; i: centriolar complex, X 40000; j – l: flagella cross sections; j and k, X 80000; l, X 69000; m and n: flagella longitudinal sections; m, X 23000; n, X 31500. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubular doublets; F: flagellum; HE: head; M: mitochondria; MC: membranous compartment; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.
Fig. 1 in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 1: Cyphocharax modestus (a and d), Potamorhina altamazonica (c, g, h, m, and n) and Steindachnerina insculpta (b, e, f, i, j, k, l, o, p, and q) spermatids. a - f: early spermatids; a: longitudinal section, X 13200; b and e: midpiece longitudinal sections; b, X 17000; e, X 18400; c: centriole anchorage, X 31500; d: centriolar complex, X 17000; f: midpiece cross section, X 18400; g – m: spermatids; g –j: longitudinal sections; g, X 13600; h – j, X 13200; k: centriolar complex, X 17000; l and m: midpiece cross sections, X 11900; n – q: late spermatids; n and o: midpiece cross sections; n, X 13600; o, X 14700; p: spermatid longitudinal section, X 13200; q, flagella cross sections, X 42000. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubule doublets; F: flagellum; G: Golgi complex; I: intercellular bridges; M: mitochondrion; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa; white asterisks: anchorage fibrils.
Fig. 4. Cyphocharax spilotus spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 4. Cyphocharax spilotus spermatozoa. a: spermatozoon longitudinal section, X 11900; b: midpiece longitudinal section, X 18500; c - f: midpiece cross sections; c and d, X17000; e, X 23000; f, X 17200; g and j: flagella cross-sections; g, X 34000; j, X 4200; h: mitochondrion, X 22000; i and k: flagella longitudinal sections; i, X 31500; k, X 23000. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubule doublets; F: flagellum; HE: head; M: mitochondria; MC: membranous compartment; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.
Fig. 6. Steindachnerina insculpta spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Fig. 6. Steindachnerina insculpta spermatozoa. a: spermatozoon longitudinal section, X 13600; b: centriolar complex, X 46200; c and h: midpiece longitudinal sections; c, X 22100; h, X 23800; d - g: midpiece cross sections; d, X 22000; e, X 27600; f, X 25200; g, X 23000; i and j: flagella cross sections; i, X 53300; j, X 37800; k and l: flagella longitudinal sections, X 23000. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubular doublets; E: axoneme end; F: flagellum; H: membranous hoops; HE: head; M: mitochondria; MC: membranous compartment; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.
Flagellum tapering and midpiece volume in songbird spermatozoa
<p><span>In contrast to numerous studies on spermatozoa length, relatively little work focuses on the width of spermatozoa, particularly the width of the midpiece and flagellum. In flagellated spermatozoa, the flagellum provides forward thrust while energy may be provided via mitochondria in the midpiece and/or through glycolysis along the flagellum itself. Longer flagella may be able to provide greater thrust but may also require stronger structural features and more or larger mitochondria to supply sufficient energy. Here we use SEM imaging to investigate the ultrastructure of spermatozoa from 55 passerine species in 26 taxonomic families in the Passerides infraorder. Our data confirm the qualitative observation that the flagellum tapers along its length, and we show that longer flagella are wider at the neck. This pattern is similar to mammals, and likely reflects the need for longer cells to be stronger against shearing forces. We further estimate the volume of the mitochondrial helix and show that it correlates well with midpiece length, supporting the use of midpiece length as a proxy for mitochondrial volume, at least in between-species studies where midpiece length is highly variable. These results provide important context for understanding the evolutionary correlations among different sperm cell components and dimensions. </span></p>
Ultrastructure description of the spermatozoa of the Amazon bonytongue Arapaima gigas (Schinz, 1822)
<p>Dataset containing micrographs obtained through scanning and transmission electron microscopy (SEM and TEM) depicting the ultrastructure of the spermatozoa of <em>Arapaima gigas</em> (Schinz, 1822)</p>
Novelty and emergent patterns in sperm: morphological diversity and evolution of spermatozoa and sperm conjugation in ground beetles (Coleoptera: Carabidae)
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Flagellum tapering and midpiece volume in songbird spermatozoa
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Fig. 1. Fresh pejerrey spermatozoa stained with eosin. H in Ultrastructure of fresh and post thawed sperm of pejerrey Odontesthes bonariensis (Atheriniformes)
Fig. 1. Fresh pejerrey spermatozoa stained with eosin. H: Head; MP: Midpiece; F: Flagellum.
Spermatozoa RRBS data: Post-Bismark aligned files extracted for the methylation call for every single C in the CpG context of sperm cells of Murrah buffalo bulls under heat stress
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Fig. 7 in Comparative spermatozoa ultrastructure of neotropical grass frogs (genus Leptodactylus) with comments on anuran reproductive modes and phylogeny
Fig. 7. Optimization of ultrastructural characters (characters 6 to 8, and 11 to 13) of the spermatozoa on a pruned phylogenetic hypothesis for Leptodactylidae. See list of characters and bibliographic sources in Table 3. Colors correspond to: gray, ambiguity; blue, state 0; red, state 1.
Fig. 8 in Comparative spermatozoa ultrastructure of neotropical grass frogs (genus Leptodactylus) with comments on anuran reproductive modes and phylogeny
Fig. 8. Taxonomic distribution and optimization of 11 selected ultrastructural characters of the spermatozoa on the phylogenetic hypothesis of Leptodactylus proposed by de S´a et al. (2014) and subsequent modifications (see materials and methods section). Numbers refer to characters described in Results section.
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Allen Brain Atlas
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.