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A Study on Structural Characteristics of Intestinal Tract of the Air-Breathing Loach, Paramisgurnus dabryanus (Sauvage, 1878)

A Study on Structural Characteristics of Intestinal Tract of the Air-Breathing Loach, Paramisgurnus dabryanus (Sauvage, 1878)

YaQiu Liu and ZhiJian Wang*

Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, The Key Laboratory of Aquatic Science of Chongqing, School of Life Science, Southwest University, Chongqing 400715, China

*      Corresponding author: wangzj1969@126.com

Fig 2
Histological structure and ultrastructure of the intestinal tract of P. dabryanus. A, transverse-section of anterior intestine: simple columnar epithelium, goblet cells in epithelial mucous membrane of anterior intestine, submucosa and muscular layer were shown; B, transverse-section of middle intestine: columnar epithelium and goblet cells in the epithelial mucous membrane of middle intestine, submucosa and muscular layer were shown; C, transverse-section of posterior intestine: columnar epithelium, goblet cells in epithelial mucous membrane of posterior intestine, submucosa and muscular layer were shown. The blue arrow notes the blood vessels; D, showing the mucous epithelial cell of anterior intestine; E, showing the mucous epithelium cell of middle intestine; F, showing the mucous epithelium cell of posterior intestine and blood capillary; G, showing epithelial cell in mucous membrane of posterior intestine adjacent to a capillary. Black arrow notes the electron-dense vesicles; White arrow notes the lamella bodies; H, showing the epithelium in mucous membrane of posterior intestine and endothelial cell of capillary. Black arrowhead notes pore; and White arrow notes pyramidal projection of endothelial cell protruding into the capillary lumen; I, showing thin layers of endothelial cell. White arrows indicate the lamella bodies. Ad, adventitia; BI, basal lamina; C, capillary; CL, central lacteal; Er, erythrocyte; EnC, endothelial cell; jc, junctional complex; L, lumen; M, mucous layer; m, mitochondria; MC, mucous cell; md, mucus droplet; mv , microvillus; n , nucleus; pv, pinocytotic vesicle; PVC, pavement epithelial cell; SCE, simple columnar epithelium; SM, submucosa.
Fig 1
Morphology observation on the surface of the intestinal tract of P. dabryanus. A, intestinal tract of P. dabryanus; B, the anatomy of anterior intestine, the white arrow notes the intestinal folds; C, the anatomy of middle intestine, the white arrow notes the intestinal folds; the black arrow notes the blood vessels underneath the intestinal epithelial tissue; D, the anatomy of posterior intestine, black arrow indicate the main blood vessels underneath the intestine epithelial tissue, * notes the branching blood vessel network; E, the white arrow notes the secretory hole of the secretory cells; the black arrow indicate the microvillus; F, the white arrow notes the secretory hole of the secretory cells; the black arrow indicate the microvillus; G, the white arrow notes the secretory hole of the secretory cells; AI, anterior intestine; L, liver; MI, middle intestine; PI, posterior intestine

Table 1                                                                                               

Pakistan Journal of Zoology

June

Vol. 50, Iss. 3, Pages 799-1198

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