Morphogenesis of Olfactory organ of the eastern long-necked turtle (Chelodina longicollis)

Authors

  • Daryna Shkabura Lesya Ukrainka Volyn National University
  • Yaroslav Stepanyuk Lesya Ukrainka Volyn National University https://orcid.org/0000-0002-8792-3670

DOI:

https://doi.org/10.29038/2617-4723-2020-390-2-66-71

Keywords:

turtles, olfactory organ, main olfactory epithelium, vomeronasal epithelium

Abstract

The study of olfactory analyzer development of reptiles is very important in evolutionary and comparative-anatomical aspects. The olfactory analyzer of different reptiles has significant differences in morphology. The olfactory analyzer of lizards and snakes is anatomically divided into the main and accessory (vomeronasal) systems. The olfactory organ of turtles has distinctive features of organization. There is no morphological separation between the main olfactory and vomeronasal systems in the olfactory organ of most turtles.
The article describes the key stages of olfactory structures development of eastern long-necked turtle (Chelodinalongicollis). The olfactory organ consists of vestibulum, nasal cavity and nasopharyngeal duct, which opens into the oral cavity through choanae. The nasal cavity is divided by a narrow section of non-sensory epithelium into a dorsal part, which is lined by olfactory epithelium, and ventral, which is lined by vomeronasal epithelium. The ventral part of the nasal cavity has medial diverticula, which significantly increases the volume of the vomeronasal epithelium. The olfactory epithelium has numerous Bowman's glands, that are absent in the vomeronasal epithelium. The duct of the lateral olfactory gland opens at the place of transition of the vestibulum into the nasal cavity. This gland moisturizes the main olfactory epithelium, which is most in contact with air. The presence of the vomeronasal nerve, individual fibers of which depart from the ventral part of the nasal cavity and enter the medial surface of the olfactory bulb, confirms the existence of the vomeronasal system in turtles.

References

1. Nakamuta, N.; Nakamuta, S.; Kato, H.; Yamamoto, Y. Morphological study on the olfactory systems of the snapping turtle, Chelydra serpentina. Tissue and Cell 2016, 48 (3), p 145–151.
2. Parsons, T. S. Evolution of the nasal structure in the lower tetrapods. American Zoologist 1967, 7 (3), p 397–413.
3. Saito, K.; Shoji, T.; Uchida, I.; Ueda, H. Structure of the olfactory and vomeronasal epithelia in the loggerhead turtle Caretta caretta. Fish Sci 2000, 66, p 409‒411.
4. Halpern, M.; Martinez-Marcos, A. Structure and function of the vomeronasal system: an update. Progress in Neurobiology 2003, 70, p 245–318.
5. Hatanaka, T.; Shibuya, T.; Inouchi, J. Induced wave responses of the accessory olfactory bulb to odorants in two species of turtle, pseudemys scripta and geoclemys reevesii. Comparative Biochemistry and Physiology Part A: Physiology 1988, 91 (2), p 377–385.
6. Tytiuk, O.; Hrubyi, V.; Stepanyuk, Ya.; Yaryhin, O. Prostorova rekonstruktsiia niukhovykh struktur Lacertaviridis za dopomohoiu kompiuternoho modeliuvannia [Spatial Reconstruction of Olfactory Structures Lacerta viridis by Means of Computer Simulation]. Naukovyi visnyk Skhidnoievropeiskoho natsionalnoho universytetu imeni Lesi Ukrainky 2015, 12 (313), c 99‒104. (In Ukrainian)
7. Bertmar, G. Evolution of vomeronasal organs in vertebrates. Evolution 1981, 35, р 359–366.
8. Halpern, M. The organization and function of the vomeronasal system. Annual Review of Neuroscience 1987, 10 (1), p 325–362.
9. Kratzing, J. E. The fine structure of the olfactory and vomeronasal organs of a lizard (Tiliqua scincoides scincoides). Cell and tissue research 1975, 156 (2), p 239–252.

Published

2021-03-09

How to Cite

Shkabura, D., & Stepanyuk, Y. (2021). Morphogenesis of Olfactory organ of the eastern long-necked turtle (Chelodina longicollis). Notes in Current Biology, (2(390), 66–71. https://doi.org/10.29038/2617-4723-2020-390-2-66-71