Ultrastructural Study of the Alimentary Tract of Two Reptilian Species the Lizard Scincus scincus and the Snake Natrix tessellata

Abdeen, Rasha E Ahmed M

doi:10.4172/2157-7099.s4-010

Cited by 2 publications

(3 citation statements)

References 30 publications

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“…Further, in the gastric mucosal glands, shallow and diminutive gastric pits were arranged in the dorsal surface extruding gastric secretions to the stomach lumen. These results agreed with Boonyoung (2017) and Abo-Eleneen et al (2014) whom reported similar distribution for gastric pores in the stomach of C. rynchops and Natrix tessellate , respectively. The gastric glands of P. sibilans were unique in that they possessed large oval-shaped mucous glands at the distal region of mucosa, the isthmus.…”

Section: Discussionsupporting

confidence: 91%

“…Also, the mucosa was lined by pseudostratified columnar epithelium interspersed with goblet cells (Khamas & Reeves, 2011; Boonyoung et al, 2017). Notably, the mucosa bears numerous folia toward the luminal space (Abo-Eleneen et al, 2014). It was thus imperative that the highly folded esophageal mucosal folds, as evidenced by our histological and SEM investigations, played an essential role in the extraordinary esophageal distension when swallowing larger prey.…”

Section: Discussionmentioning

confidence: 99%

“…The mucosal lining consisted of simple prismatic epithelium interspersed with goblet cells and absorptive enterocytes. Also, the mucosal lining projected perpendicular to the luminal space as elongated, finger-like and tortuous villi; bearing goblet orifices at dorsal and lateral sides (Abo-Eleneen et al, 2014; Gogone et al, 2017). We have detected increased lymphocytic activity in the submucosa.…”

Section: Discussionmentioning

confidence: 99%

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Structural and Functional Characterization of the Tongue and Digestive Tract ofPsammophis sibilans(Squamata, Lamprophiidae): Adaptive Strategies for Foraging and Feeding Behaviors

et al. 2020

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We describe the morphological adaptations of the tongue and gastrointestinal tract of the striped sand snake Psammophis sibilans and discuss their functional importance. Using standard histological, histochemical, and scanning electron microscopy techniques, we analyzed 11 adult snakes of both sexes. Our findings showed that the bifurcated non-papillate tongue exhibited chemoreceptive adaptions to squamate foraging behavior. The lingual apex tapered terminally with sensory spines, and the body of the tongue possesses a characteristic central odor–receptor chamber that might serve to trap and retain scent molecules. Furthermore, the intrinsic musculature showed interwoven and well-developed transverse, vertical and longitudinal muscle fibers that control contraction and retraction during probing and flicking. The esophagus displayed highly folded mucosa lined with columnar epithelium with goblet cells. In contrast, the stomach mucosa formed finger-like gastric rugae, encompassing tubular glands with dorsal gastric pits. The intestine is distinct from other vertebrates in lacking the crypts of Lieberkühn in the tunica mucosa and submucosa. The intestine mucosa is mostly arranged in interdigitating villi oriented perpendicular to the luminal surface. We extrapolated subtle variations for both acid and neutral mucopolysaccharides and glycoproteins localization as well as collagen fibers using histochemical analyses. The elaborate histo-morphological and functional adaptation of the tongue and digestive tract plays a pivotal role in foraging and feeding behavior.

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Section: Discussionsupporting

confidence: 91%