Connections of the lateral cortex in the lizard Podarcis hispanica

Martı́nez-Garcı́a, Fernando; Amiguet, Miguel; Olucha, Francisco E.; López‐García, Carlos

doi:10.1016/0304-3940(86)90009-1

Cited by 49 publications

(35 citation statements)

References 11 publications

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“…A bilateral projection from the NS to the LC also has been found in the lizards P. hispanica (Martínez-García et al, 1986, 1993b and G. gecko (Bruce and Butler, 1984). Martínez-García et al have suggested the possibility of integration of olfactory and vomeronasal information in the LC.…”

Section: Convergence Of Olfactory and Vomeronasal Information In The mentioning

confidence: 95%

“…4D) has not been shown in other reptiles, but its presence was suggested in the lizard P. hispanica (Martínez-García et al, 1986;Martínez-García and Olucha, 1988). In the lizard G. gecko, the projection from the LC to the MC has been suggested to give rise to boutons en passant in the DC (Hoogland and Vermeulen-Vanderzee, 1995).…”

Section: Intratelencephalic Projections Of the Nsmentioning

confidence: 99%

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Afferent and efferent connections of the nucleus sphericus in the snakeThamnophis sirtalis: Convergence of olfactory and vomeronasal information in the lateral cortex and the amygdala

Lanuza

Halpern

1997

J. Comp. Neurol.

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This paper is an account of the afferent and efferent projections of the nucleus sphericus (NS), which is the major secondary vomeronasal structure in the brain of the snake Thamnophis sirtalis. There are four major efferent pathways from the NS: 1) a bilateral projection that courses, surrounding the accessory olfactory tract, and innervates several amygdaloid nuclei (nucleus of the accessory olfactory tract, dorsolateral amygdala, external amygdala, and ventral anterior amygdala), the rostral parts of the dorsal and lateral cortices, and the accessory olfactory bulb; 2) a bilateral projection that courses through the medial forebrain bundle and innervates the olfactostriatum (rostral and ventral striatum); 3) a commissural projection that courses through the anterior commissure and innervates mainly the contralateral NS; and 4) a meager bilateral projection to the lateral hypothalamus. On the other hand, important afferent projections to the NS arise solely in the accessory olfactory bulb, the nucleus of the accessory olfactory tract, and the contralateral NS. This pattern of connections has three important implications: first, the lateral cortex probably integrates olfactory and vomeronasal information. Second, because the NS projection to the hypothalamus is meager and does not reach the ventromedial hypothalamic nucleus, vomeronasal information from the NS is not relayed directly to that nucleus, as previously reported. Finally, a structure located in the rostral and ventral telencephalon, the olfactostriatum, stands as the major tertiary vomeronasal center in the snake brain. These three conclusions change to an important extent our previous picture of how vomeronasal information is processed in the brain of reptiles.

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Section: Convergence Of Olfactory and Vomeronasal Information In The mentioning

confidence: 95%

Section: Intratelencephalic Projections Of the Nsmentioning

confidence: 99%

Afferent and efferent connections of the nucleus sphericus in the snakeThamnophis sirtalis: Convergence of olfactory and vomeronasal information in the lateral cortex and the amygdala

Lanuza

Halpern

1997

J. Comp. Neurol.

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“…There are three main regions within the reptilian cortex, the medial cortex (MC), dorsal cortex (DC) and lateral cortex (LC; Figure 1). Anterograde tract tracing of neurons in the olfactory bulbs of the P. hispanica demonstrated that the LC has more similarity to the mammalian olfactory cortex and is not directly involved with spatial functions (Martinez-Garcia et al, 1986). The dorsal cortex has circuitry shared with the medial cortex that resembles that of limbic system structures in mammals.…”

Section: Cross Species Neuroanatomical Comparisonmentioning

confidence: 99%

“…Specifically, the medial cortex (MC) and dorsal cortex (DC) are involved with hippocampal-like functions, such as spatial memory (Day, 2001) while the other cortical region, the lateral cortex (LC), is involved with olfaction (Martinez-Garcia et al, 1986). In reptiles, the MC and DC have very similar circuitry (Lopez-Garcia & Martinez-Guijarro, 1988), cytoarchitecture (Martinez-Guijarro, 1991), and neuronal life history (Dávila et.al., 1993) as the hippocampus.…”

Section: Introductionmentioning

confidence: 99%

Territorial Behavior and Cortical Brain Plasticity in Adult Male Sceloporus Occidentalis

Pfau¹

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Territorial Behavior and Cortical Brain Plasticity in Adult Male Sceloporus occidentalis Daniel Robert PfauThe hippocampus is a brain region that can undergo tremendous plasticity in adulthood. The hippocampus is related to the formation of spatial memories in birds and mammals. In birds, plasticity in the hippocampus occurs when formation of such memories is directly relevant to survival or reproduction, such as for breeding or food caching. In reptiles, the homologues to the hippocampus are the dorsal and medial cortices (DC and MC). In several lizard, snake and turtle species, these structures have been related to spatial memory. Experimental investigations indicate that differences in DC volume are related to space use associated with differing foraging ecologies. Differences in MC volume have been associated with territory size-based mate acquisition strategies. Furthermore, territory size has previously been correlated with plasma testosterone (T) levels. Therefore, I hypothesized that neuroplasticity within the MC/DC is controlled by demands on spatial navigation and seasonal differences and that these changes may involve the action of T. During two experimental trials, male Western Fence Lizards (Sceloporus occidentalis) were placed into either large or small semi-natural enclosures and allowed to interact with a female and intruder males over the span of seven weeks. One trial was performed during the spring breeding season and the other during the summer non breeding season, to examine seasonal differences in plasticity. Blood samples were collected at initial time of capture and before sacrifice to measure plasma T. Immunostaining for doublecortin was used to determine the density of immature neurons in each region, and cresyl violet staining allowed for volume measurements of specific regions. MC cell layer neurogenesis was higher in lizards placed in large enclosures than those in small enclosures and higher in the summer than in the spring. DC volume was smaller in lizards held in large enclosures than those in small enclosures. The decreased DC volume seen lizards held in large enclosures may indicate a cost to the increased neurogenesis in the MC of lizards in the same enclosures. These results indicate a possible trade-off between DC volume and MC neurogenesis that allows for switching between the ability to solve novel spatial tasks using the DC while storing a cognitive map in the MC. During the spring, T had no relationship with MC volume, while during the summer this was negative, so effects of T on the MC may be seasonal.

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“…The olfactory system consists of the main olfactory bulb, responsible for capturing odors at the olfactory epthelium and transmitting them to the olfactory bulb, and the accessory olfactory bulb (AOB), responsible for processing pheromones responsible for chemical social communication. These project to the lateral cortex (LC) in reptiles, which is considered homologous to the mammalian olfactory cortex (Hoogland and Vermeulen-Vanderzee, 1995;Martinez-Garcia et al, 1986). Coronal sections from rostral to caudal through the telencephalon of P. regius highlighting regions determined by comparison of cresyl violet stained sections to Halpern (1980) and Smeets (1988).…”

Section: Squamate Olfactory Systemmentioning

confidence: 99%

Proliferation, Migration, and Survival of Cells in the Telencephalon of the Ball Python, Python Regius

Bales¹

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Connections of the lateral cortex in the lizard Podarcis hispanica

Cited by 49 publications

References 11 publications

Afferent and efferent connections of the nucleus sphericus in the snakeThamnophis sirtalis: Convergence of olfactory and vomeronasal information in the lateral cortex and the amygdala

Afferent and efferent connections of the nucleus sphericus in the snakeThamnophis sirtalis: Convergence of olfactory and vomeronasal information in the lateral cortex and the amygdala

Territorial Behavior and Cortical Brain Plasticity in Adult Male Sceloporus Occidentalis

Proliferation, Migration, and Survival of Cells in the Telencephalon of the Ball Python, Python Regius

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