Afferent and efferent connections of the parapineal organ in lampreys: A tract tracing and immunocytochemical study

Yáñez, Julián; Pombal, Manuel A.; Anadón, Ramón

doi:10.1002/(sici)1096-9861(19990111)403:2<171::aid-cne3>3.0.co;2-m

Cited by 69 publications

(11 citation statements)

References 69 publications

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“…Given the approaches we have used, we cannot unequivocally conclude that regions from which we have not observed afferent input do not project to the habenulae. Consequently, there could still be pallial afferents to the habenula, but our results are in agreement with results in other teleosts (Villani et al, 1996 ; Yáñez and Anadón, 1996 ; Yáñez et al, 1999 ) in which no pallial projections to the habenula have been observed. The pallial neurons identified by Hendricks and Jesuthasan ( 2007 ) are likely to be mitral cells of the olfactory bulb, we suggest this for two reasons.…”

Section: Discussionsupporting

confidence: 93%

“…The mammalian ENT is a pallidal nucleus that seems to modulate motor behaviors through its projections to the lateral habenula (Shabel et al, 2012 ). This circuit appears to be highly conserved across the phylum, as an equivalent pallidal system has been identified in lamprey (Yáñez and Anadón, 1994 ; Yáñez et al, 1999 ; Stephenson-Jones et al, 2011 , 2012 , 2013 ). Although the ENT of rat contains both GABA and glutamate, the projection to the habenula is excitatory (Shabel et al, 2012 , 2014 ), and this is also found in lamprey (Stephenson-Jones et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

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Afferent Connectivity of the Zebrafish Habenulae

Turner

Hawkins

Yáñez

et al. 2016

Front. Neural Circuits

143

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The habenulae are bilateral nuclei located in the dorsal diencephalon that are conserved across vertebrates. Here we describe the main afferents to the habenulae in larval and adult zebrafish. We observe afferents from the subpallium, nucleus rostrolateralis, posterior tuberculum, posterior hypothalamic lobe, median raphe; we also see asymmetric afferents from olfactory bulb to the right habenula, and from the parapineal to the left habenula. In addition, we find afferents from a ventrolateral telencephalic nucleus that neurochemical and hodological data identify as the ventral entopeduncular nucleus (vENT), confirming and extending observations of Amo et al. (2014). Fate map and marker studies suggest that vENT originates from the diencephalic prethalamic eminence and extends into the lateral telencephalon from 48 to 120 hour post-fertilization (hpf). No afferents to the habenula were observed from the dorsal entopeduncular nucleus (dENT). Consequently, we confirm that the vENT (and not the dENT) should be considered as the entopeduncular nucleus “proper” in zebrafish. Furthermore, comparison with data in other vertebrates suggests that the vENT is a conserved basal ganglia nucleus, being homologous to the entopeduncular nucleus of mammals (internal segment of the globus pallidus of primates) by both embryonic origin and projections, as previously suggested by Amo et al. (2014).

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Afferent Connectivity of the Zebrafish Habenulae

Turner

Hawkins

Yáñez

et al. 2016

Front. Neural Circuits

143

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“…The pineal complex in lampreys is formed by the pineal and the parapineal organs (Eddy and Strahan, 1970 ; Puzdrowski and Northcutt, 1989 ; Pombal et al, 1999 ; Yáñez et al, 1999 ), which participate in non-visual photo-perception and neuroendocrine control of the circadian rhythms in these animals, as it does in a range of vertebrates (Ekström and Meissl, 1997 , 2003 ; Vernadakis et al, 1998 ). The pineal organ has also been documented in extinct agnathans, where it was similar in relative size to that of contemporary ammocoetes (Gai et al, 2011 ), suggesting that non-visual light perception was also highly developed in these extinct groups.…”

Section: Discussionmentioning

confidence: 99%

Ontogenetic shifts in brain scaling reflect behavioral changes in the life cycle of the pouched lamprey Geotria australis

et al. 2015

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Very few studies have described brain scaling in vertebrates throughout ontogeny and none in lampreys, one of the two surviving groups of the early agnathan (jawless) stage in vertebrate evolution. The life cycle of anadromous parasitic lampreys comprises two divergent trophic phases, firstly filter-feeding as larvae in freshwater and secondly parasitism as adults in the sea, with the transition marked by a radical metamorphosis. We characterized the growth of the brain during the life cycle of the pouched lamprey Geotria australis, an anadromous parasitic lamprey, focusing on the scaling between brain and body during ontogeny and testing the hypothesis that the vast transitions in behavior and environment are reflected in differences in the scaling and relative size of the major brain subdivisions throughout life. The body and brain mass and the volume of six brain structures of G. australis, representing six points of the life cycle, were recorded, ranging from the early larval stage to the final stage of spawning and death. Brain mass does not increase linearly with body mass during the ontogeny of G. australis. During metamorphosis, brain mass increases markedly, even though the body mass does not increase, reflecting an overall growth of the brain, with particularly large increases in the volume of the optic tectum and other visual areas of the brain and, to a lesser extent, the olfactory bulbs. These results are consistent with the conclusions that ammocoetes rely predominantly on non-visual and chemosensory signals, while adults rely on both visual and olfactory cues.

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“…Similarly with a number of fish and reptile species the lamprey pineal is directly sensitive to light signals (81), and therefore it is potentially capable of directly converting light signals into a melatonin secretion pattern. This gland appears like a vesicle connected to the posterior commissure through a long stalk and is part of the pineal complex which includes also the parapineal organ located ventral to the pineal (82). In addition to retinal and pineal photosensitive structures, it must also be noted that in lamprey there is evidence of encephalic or “deep-brain” photoreceptors that may convey light information directly to the specific brain systems which they are attached to (83).…”

Section: Effect Of Photoperiod and Temperature On Lamprey Reproductionmentioning

confidence: 99%

Integrative Neuro-Endocrine Pathways in the Control of Reproduction in Lamprey: A Brief Review

Freamat

Sower

2013

Front. Endocrinol.

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The gonadotropin-releasing hormone (GnRH) system is well known as the main regulator of reproductive physiology in vertebrates. It is also part of a network of brain structures and pathways that integrate information from the internal and external milieu and coordinate the adaptive behavioral and physiological responses to social and reproductive survival needs. In this paper we review the state of knowledge of the GnRH system in relation to the behavior, external, and internal factors that control reproduction in one of the oldest lineage of vertebrates, the lampreys.

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Afferent and efferent connections of the parapineal organ in lampreys: A tract tracing and immunocytochemical study

Cited by 69 publications

References 69 publications

Afferent Connectivity of the Zebrafish Habenulae

Afferent Connectivity of the Zebrafish Habenulae

Ontogenetic shifts in brain scaling reflect behavioral changes in the life cycle of the pouched lamprey Geotria australis

Integrative Neuro-Endocrine Pathways in the Control of Reproduction in Lamprey: A Brief Review

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