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52 results for “male reproductive system”
Figure 3 in Anatomical and histochemical descriptions of the male reproductive system of Diachasmimorpha longicaudata (Ashmed) (Hymenoptera: Braconidae)
Figure 3 Histology of the male reproductive system of Diachasmimorpha longicaudata. A. Longitudinal section of the testicle, showing the presence of only one follicle.B. Germarium region with spermatogonia from the testicular follicle (circle). Spermatogonia (Sg). C. Cysts with spermatocytes in the testicular follicle growth zone (circle). Spermatocytes (Sc). D. Testicular follicle with cysts at different stages of spermatogenesis: Cystic cell (arrow continues), spermatids (dashed circle), spermatozoa in bundles with elongated shape (continuous circle), spermatozoa bundles (dotted arrow), conjunctiva capsule (C). Spermatids (St); Spermatozoa (Sz). E. Cyst containing mature spermatozoa (arrow), cystic cell nucleus (CC).
Figure 5 in Anatomical and histochemical descriptions of the male reproductive system of Diachasmimorpha longicaudata (Ashmed) (Hymenoptera: Braconidae)
Figure 5 Histochemistry of the accessory glands of Diachasmimorpha longicaudata. A. Longitudinal section and B. cross section of the accessory gland stained with Xylidine Ponceau. Lumen (L), protein secretions (arrow).C. Accessory gland wall containing secretory vesicles (arrow). D and E. PAS. positive for secretions and substances present in the apical region of secretory cells, and pavement epithelial cells (arrow).
Figure 1 in Anatomical and histochemical descriptions of the male reproductive system of Diachasmimorpha longicaudata (Ashmed) (Hymenoptera: Braconidae)
Figure 1 Photomicrograph of the male reproductive system of Diachasmimorpha longicaudata. A. The testes and seminal vesicles are surrounded by the capsule (c), accessory gland (g), ejaculatory duct (ed), B. testicles after capsule rupture. Testis (t), deferent duct (dd), seminal vesicle (sv), accessory glands (g), ejaculatory duct (ed) and aedeagus (ae).
Data from: Mating system variation and gene expression in the male reproductive tract of Peromyscus mice
<p>Genes involved in reproduction often evolve rapidly at the sequence level due to postcopulatory sexual selection (PCSS) driven by male-male competition and male-female sexual conflict, but the impact of PCSS on gene expression has been under-explored. Further, though multiple tissues contribute to male reproductive success, most studies have focused on the testes. To explore the influence of mating system variation on reproductive tract gene expression in natural populations, we captured adult males from monogamous <em>Peromyscus californicus</em> and polygynandrous<em> P. boylii</em> and <em>P. maniculatus</em>. We generated RNAseq libraries, quantified gene expression in the testis, seminal vesicle, epididymis, and liver, and identified 3,627 mating system-associated differentially expressed genes (MS-DEGs), where expression shifted in the same direction in <em>P. maniculatus</em> and <em>P. boylii</em> relative to <em>P. californicus</em>. Gene expression variation was most strongly associated with mating behavior in the seminal vesicles, where 89% of differentially expressed genes were MS-DEGs, including key seminal fluid proteins <em>Svs2</em> and <em>Pate4</em>. We also used published rodent genomes to test for positive and relaxed selection on <em>Peromyscus</em>-expressed genes. Though we did not observe more overlap than expected by chance between MS-DEGs and positively selected genes, 203 MS-DEGs showed evidence of positive selection. Fourteen reproductive genes were under tree-wide positive selection but convergent relaxed selection in <em>P. californicus</em> and <em>Microtus ochrogaster</em>, a distantly related monogamous species. Changes in transcript abundance and gene sequence evolution in association with mating behavior suggest that male mice may respond to sexual selection intensity by altering aspects of sperm motility, sperm-egg binding, and copulatory plug formation.</p>
Data from: Mating system variation and gene expression in the male reproductive tract of Peromyscus mice
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The intensity of sexual selection, body size and reproductive success in a mating system with male-male combat: Is bigger better?
Body size is a key selected trait in many animal systems: larger size is sexually selected for in males because it confers a reproductive advantage during contest competition for access to females, and larger females are naturally selected for fecundity. Herein, we used radio-telemetry to gather a large dataset of male-female interactions and DNA paternity analyses to characterize the intensity of sexual selection and the link between two body size metrics (body length and condition, the latter manipulated experimentally for males) and reproductive success in a population of puff adders (Bitis arietans). Our multiple estimates of the intensity of sexual selection generally indicated that males experienced stronger sexual selection than females. However, the Bateman gradients did not differ by sex, despite the fact that males increased reproductive success by mating with multiple females while females did not. We also found no strong evidence that females experienced indirect fitness benefits through multiple matings. Body size was not a key predictor of male reproductive success, and for females, body condition—but not body length—was the critical fecundity trait. Altogether, a combination of factors suggests that post–copulatory mechanisms of sexual selection (e.g., sperm competition, cryptic female choice) may play critical roles in this mating system and perhaps that of other snakes. We interpret our findings in the context of sexual conflict—a ubiquitous and potent driver of mating strategy evolution—to propose a scenario for the evolution of female promiscuity that is applicable to many other animal systems where males roam widely to locate females at high costs.
FIGURE 10. Dendromonocotyle colorni. A. Male reproductive system. B in Overview of South African Dendromonocotyle (Monogenea: Monocotylidae), with descriptions of 2 new species from stingrays (Dasyatidae) kept in public aquaria
FIGURE 10. Dendromonocotyle colorni. A. Male reproductive system. B. Distal portion of male copulatory organ showing sclerotised accessory flange (af). C. Female reproductive system; note translucent coiled duct (tcd) of vagina. Scale bars = 100μm.
FIGURE 9 in On some mites (Acari: Prostigmata) from the Interior Highlands: descriptions of the male, immature stages, and female reproductive system of Pseudocheylus americanus (Ewing, 1909) and some new state records for Arkansas
FIGURE 9. Pseudocheylus americanus (Ewing, 1909). Ventrodistal adult palp, showing the tarsus appearing as a flat disc.
FIGURE 8 in On some mites (Acari: Prostigmata) from the Interior Highlands: descriptions of the male, immature stages, and female reproductive system of Pseudocheylus americanus (Ewing, 1909) and some new state records for Arkansas
FIGURE 8. Pseudocheylus americanus (Ewing, 1909). Schematic reconstruction of female reproductive system.
FIGURE 7 in On some mites (Acari: Prostigmata) from the Interior Highlands: descriptions of the male, immature stages, and female reproductive system of Pseudocheylus americanus (Ewing, 1909) and some new state records for Arkansas
FIGURE 7. Pseudocheylus americanus (Ewing, 1909). Anogenital developmental sequence. Internal structures represented by dotted lines. a—larva. b—protonymph. c—deutonymph. d—tritonymph. e—adult female. f—adult male.
Fig. 7. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 7. a. The histological section of the distal region of the ductus ejaculatorius (x100) (H&E) (LM). b. SEM photograph of the tracheae (Tr) and tracheoles (Tl) on the ductus ejaculatorius surface (SEM). c. The longitudinal section of the proximal region of the ductus ejaculatorius (x100) (H&E) (LM). d. SEM photograph of the cross section of the ductus ejaculatorius. e. The attachment of the ductus ejaculatorius to the aedeagus (SM). f. The general view muscle bundles (Mb) and the aedeagus (SEM). Ep-epithelium, Sp-spine, In-intima, Lu-lumen, Ml-muscle layer, Mlbmiddle lobe of the aedeagus, Lb-lateral lobe, Phphallobase, LM-light microscope, SM-stereo microscope, SEM-scanning electron microscope, H&E-Haematoxylin and Eosin.
Fig. 5. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 5. a. The general view of the first pair of accessory glands (Ag1) and second pair of the accessory gland (Ag2) (SM). b. Tracheae (Tr) and tracheoles (Tl) on surface of spiral shaped accessory gland 1 (SEM). c, d. The columnar epithelium and secretion material (Sm) in the first pair of accessory gland (x100) (H&E) (LM, SEM). e, f. A single layered columnar epithelium with round nucleus surrounded by muscle layer in first pair of accessory gland (x400) (H&E) (LM, SEM). Nu-nucleus, Ml-muscle layer, Epepithelium, LM-light microscope, SM-stereo microscope, SEM-scanning electron microscope, H&E-Haematoxylin and Eosin.
Fig. 6. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 6. a. The general view of the second pair of accessory gland (Ag2) (SM). b. The tracheae (Tr) and tracheoles (Tl) on the surface of second pair of accessory gland (SEM). c. SEM photograph of the cross section of the second pair of accessory gland (SEM). d. The muscle layer (Ml) and a single layer of cuboidal cells with round
Fig. 4. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 4. a. The histological section of the junction of testicular follicles into the vas deferens (x40) (H&E) (LM). b. SEM photograph of sperm tails in vas deferens lumen. c. The longitudinal section of seminal vesicle and ductus ejaculatorius (x40) (H&E) (LM). d. The tracheae (Tr) and tracheoles (Tl) on the surface of seminal vesicle (SEM). e. The muscle layer and a monolayer epithelium with round nucleus surrounding the seminal vesicle (x400) (H&E) (LM). f. SEM photograph of sperm tails in seminal vesicle lumen. Vd-vas deferens, Ep-epithelium, Sl-sperm tails, Deductus ejaculatorius, Sv-seminal vesicle, LM-light microscope, SEM-scanning electron microscope, H&E-Haematoxylin and Eosin.
Fig. 3. a, b in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 3. a, b. The differentiation of spermatogonia into spermatocytes in the growth zone located in the anterior part of the testicular follicle (x1000) (H&E) (LM, SEM). c, d. The spermatids in the maturation zone located towards the middle of the testicular follicle (x1000) (H&E) (LM, SEM). e, f. The regular bundles of spermatozoa in the differentiation zone located posterior to the testicular follicle (x400) (H&E) (LM, SEM). g. SEM photograph of convoluted sperm tails of spermatozoa. h. SEM photograph of the elongated head regions of spermatozoa. Cy-cyst, Sg-spermatogonia, Sp-spermatocytes, Hd-sperm head region, Fl-flagellum, LM-light microscope, SEM-scanning electron microscope, H&E-Haematoxylin and Eosin.
Fig. 2. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 2. a. The cross section of testis in P. subglobosa (x100) (LM) (H&E). b. Tracheae and tracheoles on the surface of testicular follicles (SEM). c. The longitudinal section of testis follicles (x200) (LM) (H&E). d. The detailed view of longitudinal section of a testis follicle (x400) (LM) (H&E). Fl-testis follicle, Sg-spematogonia, Spspematocytes, St-spermatids, Sz-spermatozoa, LM-light microscope, SEM-scanning electron microscope, H&E-Haematoxylin and Eosin.
Fig. 1. a in Notes of the internal adult male reproductive system of Pimelia subglobosa (Pallas, 1781) (Coleoptera: Tenebrionidae)
Fig. 1. a. The general view of adult male reproductive organs in P. subglobosa (SM). b. SEM photograph of testis and first pair of accessory glands. c. SM photograph of adult male reproductive organs in P. subglobosa. d. The connection to seminal vesicle by vas deferens, of testis in P. subglobosa (SEM). Te-testis, Vd-vas deferens, Sv-seminal vesicle, De-ductus ejaculatorius, Ag1- the first pair of accessory glands, Ag2- the second pair of accessory glands, Tr-tracheae, Tltracheoles, SM-stereo microscope, SEM-scanning electron microscope.
Figure 6. Male reproductive system. A in Molecular phylogeny of European Runcinida (Gastropoda, Heterobranchia): the discover of an unexpected pool of complex species, with special reference to the case of Runcina coronata
Figure 6. Male reproductive system. A, Runcina coronata, southern England (MNCN 15.05/90423). B, Runcina aurata, La Caleta, Cádiz, south-western Spain, Atlantic Ocean (MNCN 15.05/88106). C, Runcina caletensis, La Caleta, Cádiz, southwestern Spain, Atlantic Ocean (MNCN 15.05/200113). D, Runcina tingensis, Tangier, north-western Morocco, Atlantic Ocean (MNCN 15.05/91514). Shaded area indicates the presence of sperm. Abbreviations: MO, male opening; PP, penial papilla; PG, prostate gland; SV, seminal vesicle.
Distribution. Now restricted to the Channel Country of SW Queensland and the Lake Eyre Basin in NE South Australia. Descriptive notes. Head-body 95-120 mm, tail 105-160 mm, ear 23-29 mm, hindfoot 32-37 mm; weight 30-50 g. The Fawn Hopping Mouse has body form typical of hopping mice, with very long hindfeet, long tail with distal brush of longer hairs, very long ears, and large protruberant eyes. Dorsal fur is of variable color, from pale pinkish fawn to gray; ventral fur white. Unlike most other hopping mice, it has no throat pouch, but males have a glandular area of naked skin on the chest. Habitat. Occurs in low shrublands and tussock grasslands on stony ("gibber") plains and claypans. Shows marked habitat segregation from the Dusky Hopping Mouse (N. fuscus), which is closely associated with sandy substrates. Food and Feeding. The Fawn Hopping Mouse is mostly granivorous, but also eats other plant material (stems, leaves) and occasionally invertebrates. It uses succulent, salt-adapted plants around edges of claypans as a source of water. Breeding. Reproduction is probably largely opportunistic and aseasonal, with high reproductive output from near-continuous breeding after periods of high rainfall; reported littersize is 1-5, most commonly three; gestation period 38-43 days for nonlactating females. Females may mature later than other hopping mice, with reproductive maturity reached at about six months. Activity patterns. Terrestrial and nocturnal. Fawn Hopping Mice shelter during day in burrow systems that are typically simpler and shallower than those of other hopping mice. Movements, Home range and Social organization. Fawn Hopping Mice generally live singly or in small groups; typically uncommon within range, but population density may increase by an order of magnitude following periods of high rainfall. Status and Conservation. Classified as Near Threatened on The IUCN Red List. The Fawn Hopping Mouse has shown marked decline in range (estimated at greater than 50%), and presumably population size, since European settlement of Australia. This is mostlikely due to predation by the introduced house cat and Red Fox (Vulpes vulpes), and to habitat degradation associated with pastoralism. Bibliography. Brazenor (1934), Burbidge et al. (2008), Finlayson (1939), Gould (1853), Jackson & Groves (2015), Murray et al. (1999), Ogilby (1892), Thomas (1921h), Van Dyck & Strahan (2008), Waite (1898), Watts & Aslin (1981), Woinarski et al. (2014), Wood Jones (1925). in Muridae
Distribution. Now restricted to the Channel Country of SW Queensland and the Lake Eyre Basin in NE South Australia. Descriptive notes. Head-body 95-120 mm, tail 105-160 mm, ear 23-29 mm, hindfoot 32-37 mm; weight 30-50 g. The Fawn Hopping Mouse has body form typical of hopping mice, with very long hindfeet, long tail with distal brush of longer hairs, very long ears, and large protruberant eyes. Dorsal fur is of variable color, from pale pinkish fawn to gray; ventral fur white. Unlike most other hopping mice, it has no throat pouch, but males have a glandular area of naked skin on the chest. Habitat. Occurs in low shrublands and tussock grasslands on stony ("gibber") plains and claypans. Shows marked habitat segregation from the Dusky Hopping Mouse (N. fuscus), which is closely associated with sandy substrates. Food and Feeding. The Fawn Hopping Mouse is mostly granivorous, but also eats other plant material (stems, leaves) and occasionally invertebrates. It uses succulent, salt-adapted plants around edges of claypans as a source of water. Breeding. Reproduction is probably largely opportunistic and aseasonal, with high reproductive output from near-continuous breeding after periods of high rainfall; reported littersize is 1-5, most commonly three; gestation period 38-43 days for nonlactating females. Females may mature later than other hopping mice, with reproductive maturity reached at about six months. Activity patterns. Terrestrial and nocturnal. Fawn Hopping Mice shelter during day in burrow systems that are typically simpler and shallower than those of other hopping mice. Movements, Home range and Social organization. Fawn Hopping Mice generally live singly or in small groups; typically uncommon within range, but population density may increase by an order of magnitude following periods of high rainfall. Status and Conservation. Classified as Near Threatened on The IUCN Red List. The Fawn Hopping Mouse has shown marked decline in range (estimated at greater than 50%), and presumably population size, since European settlement of Australia. This is mostlikely due to predation by the introduced house cat and Red Fox (Vulpes vulpes), and to habitat degradation associated with pastoralism. Bibliography. Brazenor (1934), Burbidge et al. (2008), Finlayson (1939), Gould (1853), Jackson & Groves (2015), Murray et al. (1999), Ogilby (1892), Thomas (1921h), Van Dyck & Strahan (2008), Waite (1898), Watts & Aslin (1981), Woinarski et al. (2014), Wood Jones (1925).
Porcine reproductive and respiratory syndrome virus infects the reproductive system of male piglets and impairs development of the blood–testis barrier
<p>Porcine reproductive and respiratory syndrome virus (PRRSV) causes a highly contagious disease that threatens the global swine industry. Recent studies have focused on the damage that PRRSV causes to the reproductive system of male pigs, although <span>pathological research is lacking</span>. Therefore, <span>we </span><span>examined the pathogenic mechanisms in male piglets infected with PRRSV</span>. Gross and histopathological changes indicated that PRRSV affected the entire reproductive system, as confirmed via immunohistochemical analysis. PRRSV infected Sertoli cells and spermatogonia. To test the <span>new </span>hypothesis that PRRSV infection in piglets impairs blood–testis barrier (BTB) development, we investigated the <span>pathology</span> of PRRSV damage in the BTB. PRRSV infection significantly decreased the quantity and proliferative capacity of Sertoli cells constituting the BTB. Zonula occludens-1 and β-catenin were downregulated in cell–cell junctions. Transcriptome analysis revealed that several crucial genes and signaling pathways involved in the growth and development of Leydig cells, Sertoli cells, and tight junctions in <span>the </span>testes were downregulated. <span>Apoptosis, necroptosis</span>, inflammatory, and oxidative stress-related pathways were activated, whereas hormone secretion-related pathways were inhibited. Many Sertoli cells and spermatogonia underwent apoptosis during early differentiation. Infected piglets exhibited disrupted androgen secretion, leading to significantly reduced testosterone and anti-Müllerian hormone levels. A cytokine storm occurred, notably upregulating cytokines such as tumor necrosis factor-α and interleukin-6. Markers of oxidative-stress damage (i.e., H<sub>2</sub>O<sub>2</sub>, malondialdehyde, and glutathione) <span>were upregulated</span>, whereas antioxidant-enzyme activities (i.e., superoxide dismutase, total antioxidant capacity, and catalase) <span>were downregulated</span>. Our results demonstrated that PRRSV infect<span>ed</span> multiple organs in the male reproductive system, <span>which imparied</span> growth in the BTB. </p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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