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Histology of the digestive tract ofSaccobranchus fossilis andMacrones vittatus

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Proceedings / Indian Academy of Sciences

Conclusion

The most striking histological features of the digestive tract ofSaccobranchus fossilis are the following:-

  1. 1.

    Taste buds roughly resembling those of the mammals in structure are present in the lips, buccal epithelium and pharynx in great numbers and a few are present in the œsophageal region.

  2. 2.

    In the buccal epithelium and in the anterior part of the pharynx there are giant cells, conspicuous by their one or more nuclei. These cells are dividing cells and no mention is made of them by any of the previous authors.

  3. 3.

    The anterior region of the pharynx is separated from the posterior part, for reasons mentioned in the paper.

  4. 4.

    No part of the free surface of the posterior region of the œsophagus, is free from mucous cells. External longitudinal muscle bundles are absent in the œsophagus.

  5. 5.

    The pneumatic duct comes and joins the posterior part of the œsophagus, while the bile and the pancreatic ducts open into the anterior part of the intestine just near the pyloric end of the stomach.

  6. 6.

    The stomach is divisible into cardiac and pyloric regions. The former is conspicuous by the presence of the glands while the latter is devoid of them.

  7. 7.

    There is no pyloric valve, nevertheless, the same object is achieved by the presence of the pyloric sphincter. There is no intestinorectal valve.

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Abbreviations

B. V.:

Blood vessel

Bl. cp.:

Blood capillaries

C. M.:

Circular muscle

Ct. f.:

Connective tissue fibres

Ep.:

Epithelium

G. c.:

Goblet cell

G. Ep.:

Gastric epithelium

G. p.:

Gustatory pore

Gi. c.:

Giant cells

Gl. l.:

Gland lumen

Gl. c.:

Gland cells

Gl.:

Gland

H. s. c.:

Hollow sphere of cells

I. c.:

Investing cells

I. ep.:

Intestinal epithelium

L. m.:

Longitudinal muscle

M. c.:

Mucous cells

M. b.:

Muscle bundles

N.:

Nucleus

P. b.:

Pigment bodies

S.:

Serosa

S. s. c.:

Solid sphere of cells

S. e. ct.:

Sub-epithelial connective tissue

St. c.:

Stratum compactum

T. b.:

Taste bud

T. p.:

Top plate

T. pr.:

Tunica propria

T. s.:

Tooth substance

U. c.:

Undifferentiated cells

W. c.:

Wandering cells

Z. g.:

Zymogen granules

Bibliography

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Authors and Affiliations

  1. Central College, Bangalore, University of Mysore, India

    T. P. Vanajakshi

Authors
  1. T. P. Vanajakshi
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Additional information

Communicated by Prof. C. R. Narayan Rao.

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Vanajakshi, T.P. Histology of the digestive tract ofSaccobranchus fossilis andMacrones vittatus . Proc. Indian Acad. Sci. 7, 61–79 (1938). https://doi.org/10.1007/BF03051120

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  • DOI: https://doi.org/10.1007/BF03051120

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