Seasonal changes in the seminiferous epithelium of rhesus and bonnet monkeys

Bansode, F.W.; Chowdhury, S.R.; Dhar, J.D.

doi:10.1034/j.1600-0684.2003.00020.x

Cited by 20 publications

(9 citation statements)

References 39 publications

(58 reference statements)

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“…Although this study was a comprehensive report of bonnet monkey biology, there was little anatomical description of male. Macaca radiata is a continuous breeding animal with a peak during the months of October to December (Rao et al 1997;Bansode et al 2003). During these months, the monsoon and cold seasons are the usual climate in this part of the world.…”

Section: Discussionmentioning

confidence: 98%

Anatomical aspects of the male reproductive system in the bonnet monkey (Macaca radiata)

2009

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The normal anatomy of the male reproductive system in Macaca radiata is presented here. The external genitalia consist of a triangular button-shaped glans penis. The corpus cavernosum, and spongiosum form the vascular component of the penis and the baculum or os penis forms the non-vascular erectile component. The baculum is one of the longest in the genus macaques. The scrotal sac is non-pigmented, slightly pendulous, with scattered hairs, faintly corrugated, and does not reach the ischial callosities in the sitting posture. The testicles are ovoid in shape without appendix. Right and left testicular arteries originate at the level of the inter-vertebral disc between T12-L1 and L2-L3, respectively. Seminiferous tubules present mixed stages of spermatogenesis, i.e. single/multistage. The epididymis is crescent shaped, attached to the postero-lateral border of the testis without an appendix. Light microscopic observation revealed a characteristic high columnar epithelium with stereocilia. Clear cells or light cells are seen in the caudal region. The ductus deferens display a lumen lined by pseudo-stratified columnar epithelium separated by concentric layers of smooth muscle cells covered by serosa. The seminal vesicles are pyramidal in shape, prominently projecting above the urinary bladder, and are the largest of the accessory glands, typical of polyandrous primate genera. The prostate is conical in shape. Its base is in contact with the trigone of the bladder. Its posterior surface shows a transverse cleft separating an upper quarter, the cranial lobe, from the lower three-quarters of the gland. Compared with other macaques there are many distinguishing features in M. radiata. Excellent adaptability and spermatogenic efficiency in the laboratory environment makes this animal a good primate model for andrological research.

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Section: Discussionmentioning

confidence: 98%

Anatomical aspects of the male reproductive system in the bonnet monkey (Macaca radiata)

2009

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“…Lower Leydig cell density is thought reflect seasonal reproductive behaviour (Bansode, Chowdhury, & Dhar, ). Low numbers of Leydig cells in the testes studied may, therefore, suggest seasonal reproductive behaviour of M. marcai .…”

Section: Discussionmentioning

confidence: 99%

Morphological description of male genital organs of Marca's marmoset (Mico marcai)

Siqueira

Silva

Santana

2018

Anat Histol Embryol

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Morphological characterisation of the genital organs of primates may bring significant contributions to the understanding of different reproductive behaviours and support new conservation strategies. However, relevant or detailed descriptions of genital morphology of several primate species are still lacking. This study describes the gross and microscopic anatomy of the internal and external genitalia of Marca's marmoset (Mico marcai). The same organs described in other primate species were identified here, but some anatomical particularities were detected, such as absence of a dartos tunic, presence of a vas deferens ampulla, absence of spongious erectile tissue in the pelvic urethra, separation of prostate gland lobes by a longitudinal sulcus and lack of septation in the corpus cavernosus and spongiosus at the level of the shaft and free portion of the penis. Keratinised type 1 spicules arising from epidermal or dermal projections were found in the free portion of the penis. Microscopic analysis revealed a small bone (baculum) consisting of peripheral compact bone and a central, non-ossified area filled with vascular tissue at the distal end of this portion of the penis. Results of this study may support further comparative studies of primates' reproductive ecology.

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“…Like house sparrows and hamsters, rhesus macaques undergo seasonal cycles of gonadal growth and regression characterized by significant changes in sex steroids and gametogenesis (Riesen et al, 1971; Gupta et al, 2000; Bansode et al, 2003), in which the gonadal GnIH system may play a regulatory role. It is not at present clear why hamsters differ from songbirds and rhesus macaques in the expression patterns of GnIH and its receptor.…”

Section: Gnih In Gonadsmentioning

confidence: 99%

Neuropeptides in the gonads: from evolution to pharmacology

McGuire

Bentley

2010

Front. Pharmacol.

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Vertebrate gonads are the sites of synthesis and binding of many peptides that were initially classified as neuropeptides. These gonadal neuropeptide systems are neither well understood in isolation, nor in their interactions with other neuropeptide systems. Further, our knowledge of the control of these gonadal neuropeptides by peripheral hormones that bind to the gonads, and which themselves are under regulation by true neuropeptide systems from the hypothalamus, is relatively meager. This review discusses the existence of a variety of neuropeptides and their receptors which have been discovered in vertebrate gonads, and the possible way in which such systems could have evolved. We then focus on two key neuropeptides for regulation of the hypothalamo-pituitary-gonadal axis: gonadotropin-releasing hormone (GnRH) and gonadotropin-inhibitory hormone (GnIH). Comparative studies have provided us with a degree of understanding as to how a gonadal GnRH system might have evolved, and they have been responsible for the discovery of GnIH and its gonadal counterpart. We attempt to highlight what is known about these two key gonadal neuropeptides, how their actions differ from their hypothalamic counterparts, and how we might learn from comparative studies of them and other gonadal neuropeptides in terms of pharmacology, reproductive physiology and evolutionary biology.

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Seasonal changes in the seminiferous epithelium of rhesus and bonnet monkeys

Cited by 20 publications

References 39 publications

Anatomical aspects of the male reproductive system in the bonnet monkey (Macaca radiata)

Anatomical aspects of the male reproductive system in the bonnet monkey (Macaca radiata)

Morphological description of male genital organs of Marca's marmoset (Mico marcai)

Neuropeptides in the gonads: from evolution to pharmacology

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