Functional anatomy of the peripheral olfactory system of the african lungfish Protopterus annectens owen: Development of the primary olfactory pathway during postembryonic growth

Derivot, Jacques H.

doi:10.1002/aja.1001710103

Cited by 9 publications

(1 citation statement)

References 23 publications

(10 reference statements)

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“…Theoretically, the convergence of a higher number of olfactory receptor cells onto secondary processing units (mitral cells) in the ECL of the bulb leads to greater olfactory acuity or sensitivity [van Drongelen et al, 1978;DuChamp-Viret et al, 1989;Mei sami, 1989]. In many of the vertebrates discussed above, such an increase in the 'convergence ratio' of the bulb has been described [lungfish - Derivot, 1984b;frogs -Byrd and Burd, 1991;ferrets -Apfelbach and Weiler, 1994;rab bits -Meisami et al, 1990;rats -Meisami, 1989;Apfel bach et al, 1991J, and shown to correlate with increased olfactory sensitivity both behaviorally and physiologically [Alberts and May, 1980;Apfelbach et al, 1991].…”

Section: Patterns O F Growth In the Vertebrate Olfactory System And Tmentioning

confidence: 99%

Postembryonic Changes in the Structure of the Olfactory Bulb of the Chinook Salmon (Oncorhynchus tshawytscha) Across its Life History

Jarrard

1997

Brain Behav Evol

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Juvenile chinook salmon (Oncorhynchus tshawytscha) memorize odors characteristic of their natal stream, then use these imprinted olfactory cues to return to that same stream years later as sexually mature adults. In a preliminary effort to identify neuroanatomical changes in the salmon olfactory system that may underlie these behavioral capabilities, the structure of the olfactory bulb (OB) was studied at three developmental periods across the life history: in early juvenile development (0.1–4 months of age), in late juvenile development (11–16 months), and as spawning adults (48 months). Using antibodies that selectively label primary olfactory afferents (anti-keyhole limpet hemocyanin), combined with a thionin countemain, the telencephalon (TEL), OB, and two of the bulb''s laminar components, the olfactory nerve-glomerular layer (ONL-GL) and inner cell layer (ICL), could be easily identified. Laminar organization and relative volume (i.e. percent of OB comprised by ONL-GL or ICL) were then compared across groups, and absolute volumes of the OB, ONL-GL, and ICL were compared to that of the TEL at each stage. Three age-related processes were observed across the life history. First, a rapid increase in organizational and structural maturity of the OB was found to be confined to early juvenile life. Second, an increase in OB, ONL-GL, and ICL volume, relative to TEL volume, was found to occur across the entire life history. Lastly, the composition of the OB itself changed, in that an increase in the relative volume of the ONL-GL, and a decrease in that of the ICL, were observed across the life history. Taken together, these results indicate that the OB of young salmon matures dramatically while the fish is still in the freshwater phase of its life history. Then, during migration to the ocean and growth to the adult stage, the volume of the OB, relative to that of the telencephalon, and the relative volume of the input layer of the bulb, both undergo a marked, continuous increase. These changes in the structure, and presumably the function, of the olfactory bulb of salmon may be important in the behavioral phenomena of olfactory imprinting as juveniles and homing as adults.

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Section: Patterns O F Growth In the Vertebrate Olfactory System And Tmentioning

confidence: 99%

Postembryonic Changes in the Structure of the Olfactory Bulb of the Chinook Salmon (Oncorhynchus tshawytscha) Across its Life History

Jarrard

1997

Brain Behav Evol

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An immunohistochemical study of the telencephalon of the african lungfish, Protopterus annectens

Reiner

Northcutt

1987

J of Comparative Neurology

145

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The telencephalon of the African lungfish, Protopterus annectens, was studied by immunohistochemical techniques in order to identify the major subdivisions of the telencephalon and determine the possible homologues of these subdivisions, if any, in other vertebrates. The distributions of four different neuropeptides (substance P, leucine-enkephalin, avian pancreatic polypeptide, and LANT6), a neurotransmitter (serotonin), and a neurotransmitter-related enzyme that is involved in catecholamine synthesis (tyrosine hydroxylase) were examined. The resultant labeling patterns indicated that the telencephalon of lungfish consists of three major subdivisions--a rostrally and dorsally situated olfactory bulb, a dorsally situated pallial region located caudal to the olfactory bulbs, and a ventrally situated subpallial regions. The dorsal and lateral pallial regions, which both receive secondary olfactory input, are somewhat distinct from one another cytoarchitectonically, but their immunohistochemical labeling characteristics did not differ. Thus, the lateral pallium and the dorsal pallium together appear to constitute an olfactory pallium in lungfishes. The medial pallium was found to consist of three immunohistochemically distinct subdivisions--a dorsal cell group, an intermediate cell group, and a ventral cell group. These medial pallial fields extend throughout the entire rostrocaudal extent of the medial wall of the telencephalon. Although one or more of these medial pallial cell groups may be homologous to specific portions of the medial pallium in land vertebrates, no specific similarities were observed to support any proposed one-to-one correspondences. The possibility that one or more of the medial pallial cell groups of lungfishes correspond to cell groups located in the dorsal pallium of land vertebrates could not be excluded. The subpallium is divided into lateral, medial, and caudal subdivisions. The lateral subdivision appears to be homologous to the basal ganglia of land vertebrates since it contains neuropeptide/neurotransmitter-specific neuronal populations that are characteristic of the striatal and pallidal portions of the basal ganglia of amniotes. The medial subdivision of the subpallium shows the topographic and immunohistochemical characteristics of the septal region and the nucleus accumbens region of the amniote telencephalon. The caudal subpallium does not show any distinctive immunohistochemical labeling characteristics and its possible homologue in land vertebrates is unclear.(ABSTRACT TRUNCATED AT 400 WORDS)

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Development of the olfactory bulb in the clawed frog,Xenopus laevis: A morphological and quantitative analysis

Byrd

Burd

1991

J of Comparative Neurology

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The relationship between olfactory axons and the cells of the olfactory bulb during normal development was analyzed to determine whether olfactory afferent axons could play a role in the induction of olfactory bulb formation. The morphology of the olfactory bulb in Xenopus larvae from stages 26 to 58 and in adult frogs was analyzed with light and electron microscopy. Axons were first observed beneath the basal lamina of the neural tube at stages 30 and 32; at stage 32, neurons in this area of the neural tube began to differentiate. Synapses of olfactory axons onto young neuronal processes were observed as early as stages 36 and 38. By stage 44, all of the layers of the olfactory bulb were present. The basic structure of the mature form of the olfactory bulb was apparent as early as stage 48/49 and remained constant throughout late larval life and even into adulthood, with only the size increasing. To determine the numerical relationship between olfactory axons from both main and vomeronasal epithelia and mitral/tufted cells in the main and accessory olfactory bulbs, a quantitative study was also performed in which the number of olfactory axons and the number of mitral/tufted cells were estimated for larval stages (stages 50 to 58) and adults. The number of axons increased with stage, with a 16-fold increase between stage 58 and adulthood. The number of mitral/tufted cells increased with stage, with only a 2.3-fold increase between stage 58 and adults. There is a correlation between axon number and mitral/tufted cell number during larval development that is consistent with the hypothesis that olfactory axons influence olfactory bulb development. The convergence ratio of olfactory axons onto mitral/tufted cells was 5:1 in larvae and increased to 34:1 in adults; this increase probably results in increased olfactory sensitivity in adult frogs.

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Functional anatomy of the peripheral olfactory system of the african lungfish Protopterus annectens owen: Development of the primary olfactory pathway during postembryonic growth

Cited by 9 publications

References 23 publications

Postembryonic Changes in the Structure of the Olfactory Bulb of the Chinook Salmon <i>(Oncorhynchus tshawytscha) </i>Across its Life History

Postembryonic Changes in the Structure of the Olfactory Bulb of the Chinook Salmon <i>(Oncorhynchus tshawytscha) </i>Across its Life History

An immunohistochemical study of the telencephalon of the african lungfish, Protopterus annectens

Development of the olfactory bulb in the clawed frog,Xenopus laevis: A morphological and quantitative analysis

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