Electron Microscopic Study of Early Formation of the Tooth Enameloid of a Fish (&lt;i&gt;Hoplognathus fasciatus&lt;/i&gt;)

Inage, Toshihiko

doi:10.1679/aohc1950.38.209

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…On the other hand, intracellular production of collagen fibres has been supposed i n some reports, namely osteogenic cells i n the fracture callus of the rat (Gothlin & Ericsson, 1970), corneal epithelium of the embryonic chick (Trelstad, 1971), notochordal epithelium of the early chick embryo (Carlson, 1973), periodontal ligaments of the developing mouse, rat, hamster, guinea-pig and rabbit (Listgarten, 1973), and tooth enameloid formation of a fish, Hoplognuthus fasciatus (Inage, 1975). In these tissues only a small amount of collagen fibres was observed to be bounded by thin membrane structure.…”

Section: Discussionmentioning

confidence: 99%

Pseudo‐intracellular Collagen Tangles in Human Spinal Ganglia

Koga

Oyanagi

Oyake

1979

Neuropathology Appl Neurobio

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A new structure was found in the spinal ganglia of 6 out of 215 human autopsy cases with various disorders. It was composed of ballooned cells fully packed with fibrillar structures showing the same staining properties as collagen. Ultrastructurally the fibrillar structures were bundles of collagen fibres with a striation of about 70nm periodicity, and they were enclosed by the cell membrane invaginated in a very complex manner into the cytoplasm. This structure, which we named 'pseudo-intracellular collagen tangle', was considered to result from a disturbance in the releasing process of collagen fibre from fibroblasts. The aetiology of the structure is unknown, but it might represent one of regressive or senile changes in human spinal ganglia.

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Section: Discussionmentioning

confidence: 99%

Pseudo‐intracellular Collagen Tangles in Human Spinal Ganglia

Koga

Oyanagi

Oyake

1979

Neuropathology Appl Neurobio

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“…ln most cas,es no attempt was made to understand the peculiar arrangement of the laminae within the premaxillaries and dentaries. Studies on the masticatory apparatus of representatives of the group using routine histological and anatomical methods by Andreucci (1966Andreucci ( , 1968aAndreucci ( , 1968b, Andreucci & Britski (1969a, 1969b, 1970, 1975), Britski & Andreucci (1971, and Andreucci et alo (1974) were primarily limited to the macro-and microscopic description of the laminae and their arrangement in the bones, and to an analysis of their function in the masticatory processo The first step in solving the problem was taken by Andreucci (1970) who discovered that the tooth-bearing bones (premaxillaries and dentaries) of Sphoeroides testudineus are not formed by bony tissue but by osteodentine. Further observations led to the conclusion that all of the other elements of the skeleton (cranium and axial) except for the jaw bones are formed by bony tissue just as in other teleosts.…”

Section: Coalescence Ln the Tetraodontoideamentioning

confidence: 99%

Coalescence of teeth in fishes

et al. 1984

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“…The first possibility is that the banded fibrils in question might represent an artifact resulting from precipitation of collagen fibrils in the cell vacuoles during the specimen preparation (TRELSTAND, 1971;IMURA, TANAKA and TAKASE, 1975). The second possibility is intracellular synthesis of collagen; the fibrils in the vacuoles might represent either the intracellularly synthesized collagen or the precursors of collagen (AVERY and HAN, 1961;MEEK, 1965;GOTHLIN and ERICSSON, 1970;CARLSON, 1973;INAGE, 1975). An alternative possibility for this is a pathological or abnormal process in the course of collagen formation (WELSH, 1966;WELSH and MEYER, 1967;IMURA, TANAKA and TAKASE, 1975).…”

Section: Collagen Containing Vacuolesmentioning

confidence: 99%

Ultrastructural and Cytochemical Studies on the Remodelling of the Tracheal Cartilage

Yajima

1976

Arch. Histol. Jap., Arch. Histol. Jpn

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Summary. Ultrastructural and cytochemical studies on the remodelling of the rat tracheal cartilage have been carried out. The thickness of the tracheal cartilage was constant, during the observation periods (1 to 54 days after birth). The external perichondrium of the tracheal cartilage consisted of active fibroblasts and intercellular fibrils. The inner part of this perichondrium was a chondrogenic layer, where appositional growth was taking place. On the other hand, the internal perichondrium contained fibroblast-like cells, which were nearly twice as large as the external perichondrial fibroblasts in size and were arranged in three or four layers. The cells had well developed organella and large vacuoles which contained numerous fragments of fibrils and/or glycosaminoglycan. Many cytoplasmic processes protruded to the cartilage matrix, where the intercellular fibrils were particularly irregular in arrangement.Some vacuoles included collagen fibrils. Based on an intense acid phosphatase activity in these vacuoles and other findings, the fibrils were thought to be phagocytosed collagen of the cartilage matrix. An extensive alkaline phosphatase activity was demonstrated on the plasma membrane of fibroblasts and chondroblasts in the external perichondrium.The present investigation revealed distinct functional difference between the external and internal perichondrium of the tracheal cartilage. It is resorbed at the internal perichondrium, while it appositionally grows at the external perichondrium.The fibroblastlike cells of the internal perichondrium play an essential role in resorption of the matrix in cartilage remodelling.

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Electron Microscopic Study of Early Formation of the Tooth Enameloid of a Fish (<i>Hoplognathus fasciatus</i>)

Cited by 14 publications

References 11 publications

Pseudo‐intracellular Collagen Tangles in Human Spinal Ganglia

Pseudo‐intracellular Collagen Tangles in Human Spinal Ganglia

Coalescence of teeth in fishes

Ultrastructural and Cytochemical Studies on the Remodelling of the Tracheal Cartilage

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