Giant terminals in the dorsal octavolateralis nucleus of lampreys

Koyama, Hiromichi; Kishida, Reiji; Goris, Richard C.; Kusunoki, Toyokazu

doi:10.1002/cne.903350208

Cited by 9 publications

(8 citation statements)

References 30 publications

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“…This notion is consistent with the absence of the mesencephalic trigeminal nucleus in the adult lamprey (reviewed by Sarnat and Netzky, 1981). The dorsal medullar neurons that have been suggested to be homologous with the gnathostome mesencephalic trigeminal nucleus (Northcutt, 1979; but see Finger andRovainen, 1982, andKoyama et al, 1987) were not found at any developmental stages observed by the methods used in the present study.…”

Section: Discussioncontrasting

confidence: 58%

Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

et al. 1998

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Early embryonic development of the nervous system of a lamprey, Lampetra japonica, was studied by using immunohistochemical techniques and by scanning electron microscopy. The earliest appearance of axons was detected at Tahara's stage 21-, when dorsolateral and ventral longitudinal fasciculi were present in the hindbrain and spinal cord regions. The branchiomeric nerve roots began to appear at stage 22; the fibers were joined to the dorsolateral fasciculus proximally and also extended distally into each pharyngeal arch. The anterior neural tube was divided into several neuromeres: the mid-hindbrain sulcus became apparent first, then the portion rostral to this sulcus was subdivided into two portions by the syn-parencephalic boundary. In the hindbrain around stage 23, rhombomeres developed transiently, of which, rhombomere 4 was the most distinctive. Putative crest cells forming the octavofacial nerve root anlage were selectively adhering to rhombomere 4, whereas no crest cells were found on rhombomere 3. The assignment of the crest-derived nerve anlage to rhombomeres is conserved between gnathostomes and L. japonica. The neuromerical scheme of the neural tube of L. japonica is also mostly in accordance with that in gnathostomes, sharing the basic developmental patterning of axon bundles at early developmental stages. The most distinct difference between these two groups is the topographical relationships between the hindbrain neuraxis and pharyngeal arches, as well as the otic placode.

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Section: Discussioncontrasting

confidence: 58%

Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

et al. 1998

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“…A and A–D; Ronan and Northcutt, ; Koyama et al, ; González and Anadón, ). Both anterior and posterior lateral line fibers bear numerous varicosities along their longitudinal extend; actually, giant nerve terminals were found at the rostral and caudal ends of the electroreceptive fibers in the dorsal nucleus of the octavolateral area (Kishida et al, ; Koyama et al, ). Electrophysiological recordings in the posterior lateral line nerve of larval and adult lampreys indicate the presence of mechanoreceptive fibers responding to water movements relative to the skin (Rovainen, ; Akoev and Muraveiko, ; Gelman et al, ).…”

Section: Introductionmentioning

confidence: 99%

Development and Functional Organization of the Cranial Nerves in Lampreys

Pombal

Megı́as

2018

The Anatomical Record

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Lampreys, together with hagfishes, are the only extant representatives of the oldest branch of vertebrates, the agnathans, which are the sister group of gnathostomes; therefore, studies on these animals are of great evolutionary significance. Lampreys exhibit a particular life cycle with remarkable changes in their behavior, concomitant, in part, with important modifications in the head and its musculature, which might influence the development of the cranial nerves. In this context, some cranial nerves such as the optic nerve and the ocular motor nerves, which develop slowly during an extremely long larval period lasting more than five years, have been more thoroughly investigated; however, much less experimental information is available about others, such as the facial or the hypoglossal nerves. In addition, the possible existence of a "true" accessory nerve in these animals is still a matter of conjecture. Although growing in last decades, investigations on the physiology of the lamprey cranial nerves is scanty. This review focuses on past and recent findings that have contributed to characterize the anatomical organization of the cranial nerves in lampreys, including their components and nuclei, and their relations in the brain; in addition, comments on their development and functional role are also included. Anat Rec, 2018. © 2018 Wiley Periodicals, Inc.

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“…Ampulla-shaped electroreceptor organs containing hair cells with cilia that can be excited by cathodal stimulation is a characteristic of crown gnathostomes (Fig. 1; Andres and von During 1988;Koyama et al 1993;Northcutt and Bleckmann 1993;Gibbs 2004). Electroreception is absent in living myxinoids (hagfishes), however lampreys have nonampullary electrosensory organs (Ronan and Bodznick 1986).…”

Section: Introductionmentioning

confidence: 99%

“…This sense has been lost in most amniotes and neopterygians, and may have re-evolved twice in teleosts (Fig. 1;Bullock 1982;Bullock et al 1983;Koyama et al 1993;Gibbs 2004). Chondrichthyans are the most basal lineage of crown gnathostomes to develop a highly specialized network of ampullary organs, known as the ampullae of Lorenzini.…”

Section: Introductionmentioning

confidence: 99%

Developmental origin of shark electrosensory organs

Freitas

Zhang

Albert

et al. 2006

Evolution and Development

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Vertebrates have evolved electrosensory receptors that detect electrical stimuli on the surface of the skin and transmit them somatotopically to the brain. In chondrichthyans, the electrosensory system is composed of a cephalic network of ampullary organs, known as the ampullae of Lorenzini, that can detect extremely weak electric fields during hunting and navigation. Each ampullary organ consists of a gel-filled epidermal pit containing sensory hair cells, and synaptic connections with primary afferent neurons at the base of the pit that facilitate detection of voltage gradients over large regions of the body. The developmental origin of electroreceptors and the mechanisms that determine their spatial arrangement in the vertebrate head are not well understood. We have analyzed electroreceptor development in the lesser spotted catshark (Scyliorhinus canicula) and show that Sox8 and HNK1, two markers of the neural crest lineage, selectively mark sensory cells in ampullary organs. This represents the first evidence that the neural crest gives rise to electrosensory cells. We also show that pathfinding by cephalic mechanosensory and electrosensory axons follows the expression pattern of EphA4, a well-known guidance cue for axons and neural crest cells in osteichthyans. Expression of EphrinB2, which encodes a ligand for EphA4, marks the positions at which ampullary placodes are initiated in the epidermis, and EphA4 is expressed in surrounding mesenchyme. These results suggest that Eph-Ephrin signaling may establish an early molecular map for neural crest migration, axon guidance and placodal morphogenesis during development of the shark electrosensory system.

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Giant terminals in the dorsal octavolateralis nucleus of lampreys

Cited by 9 publications

References 30 publications

Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

Development and Functional Organization of the Cranial Nerves in Lampreys

Developmental origin of shark electrosensory organs

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