Fluids and jellies of the acusticolateralis system in relation to body fluids in Coryphaenoides rupestris and other fishes

Fänge, Ragnar; Larsson, Agne; Lidman, Ulf

doi:10.1007/bf00347309

Cited by 32 publications

References 11 publications

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Meshwork arrangement of mitochondria-rich, Na+,K+-ATPase-rich cells in the saccular epithelium of rainbow trout (Oncorhynchus mykiss) inner ear

Takagi

1997

Anat. Rec.

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Background Electrolyte composition of the teleost fish inner ear endolymph is characterized by a high potassium concentration. From the ultrastructural characteristics, the mitochondria‐rich cells (MRCs) in the inner ear epithelium are suggested to regulate the ionic composition of the endolymph. Methods In the present study, the ultrastructure of MRCs in the saccular epithelium of the rainbow trout (Onchorhynchus mykiss) was studied, and the immunocytochemical detection of Na+,K+‐ATPase, the key enzyme of the ion‐transport, in the saccular epithelium was conducted. Electrolyte composition of the saccular endolymph was also determined. Results Electron‐microscopic observations revealed that MRCs located at the periphery of the sensory macula have numerous elongated mitochondria and a well‐developed tubular system. Immunocytochemical detection of Na+,K+‐ATPase on paraffin sections showed that immunoreactive (ir‐) cells were distributed specifically around the sensory macula. Judging from their shape, size, and localization, the Na+,K+‐ATPase ir‐cells corresponded to the MRCs. The whole‐mount immunocytochemistry using Na+,K+‐ATPase as a marker for the MRC revealed that MRCs were connected with one another by extended cellular processes, and thus forming a dense meshwork structure around the macula. In the endolymph, potassium levels were 13 times higher than those in plasma, chloride levels were slightly higher whereas sodium, calcium, magnesium, and phosphate levels were lower. Conclusions Thus, the saccular MRCs abundant in Na+,K+‐ATPase are distributed around the sensory macula forming a dense meshwork structure, with the suggested function to regulate the electrolyte composition of the saccular endolymph. Anat. Rec. 248:483‐489, 1997. © 1997 Wiley‐Liss, Inc.

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Meshwork arrangement of mitochondria-rich, Na+,K+-ATPase-rich cells in the saccular epithelium of rainbow trout (Oncorhynchus mykiss) inner ear

Takagi

1997

Anat. Rec.

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Composition of fluid from the notochordal canal of the coelacanth,Latimeria chalumnae

et al. 1975

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Fluid from the notochordal canal of the coelacanth, Latimeria chalumnae, was analyzed for major inorganic and organic constituents and compared with blood serum from the same fish. Significantly or suggestively lower levels of sodium, magnesium, calcium, bicarbonate, sulfate, total carbohydrates, glucose, lactate, cholesterol, bound phosphate and total proteins were found in notochordal fluid than in serum, whereas potassium, chloride, urea, trimethylamine oxide, and total free amino acids were higher and inorganic phosphorus essentially identical. Osmolarity of notochordal fluid (1058 mOsm) exceeds that of serum (942 mOsm). A whitish precipitate in the fluid consisted of a matrix of fibers 100 A in diameter and of indefinite length. It resembled a sialoglycoprotein in composition and was stabilized by disulfide bonds. The fluid contained cellular debris.

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Ultrastructure of the sacculus and lagena in a moray eel (Gymnothorax sp.)

Popper

1979

Journal of Morphology

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The ultrastructure of the sacculus and lagena of a moray eel, Gymnothorax sp., was investigated using scanning and transmission electron microscopy. Particular emphasis was placed on the orientation of the sensory hair cells and on the ultrastructure of the sensory cells. The ciliary bundles on the sensory hair cells are of several types, each having a different size relationship between the kinocilium and stereocilia. The cell bodies of the sensory cells are similar to the mammalian type II sensory cell. There were no apparent differences in the cell bodies between sensory cells with different ciliary bundles. Hair cell orientation patterns on the saccular and lagenar maculae differ from patterns found in other fishes. The posterior side of the saccular macula in Gymnothorax has cells oriented dorsally and ventrally, as is typical in other non-ostariophysan species. The anterior end of the saccular macula has alternating groups of anteriorly and posteriorly oriented cells, a situation that differs from the more typical pattern in which anteriorly oriented cells are found on the ventral side of the macula while posteriorly oriented cells cover the dorsal side of the macula. The orientation of cells on the lagena includes ventral cells that are located above a group of dorsally oriented cells. In many other non-ostariophysans, ventrally oriented cells are generally posterior to the dorsally oriented cells.

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Fluids and jellies of the acusticolateralis system in relation to body fluids in Coryphaenoides rupestris and other fishes

Cited by 32 publications

References 11 publications

Meshwork arrangement of mitochondria-rich, Na+,K+-ATPase-rich cells in the saccular epithelium of rainbow trout (Oncorhynchus mykiss) inner ear

Meshwork arrangement of mitochondria-rich, Na+,K+-ATPase-rich cells in the saccular epithelium of rainbow trout (Oncorhynchus mykiss) inner ear

Composition of fluid from the notochordal canal of the coelacanth,Latimeria chalumnae

Ultrastructure of the sacculus and lagena in a moray eel (Gymnothorax sp.)

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