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Fig. 1 | Frontiers in Zoology

Fig. 1

From: Embryology of the VNO and associated structures in the grass snake Natrix natrix (Squamata: Natricinae): a 3D perspective

Fig. 1

a The scheme of the left side of the adult-like ophidian snout showing the spatial relationships of the vomeronasal organ, the nasal cavity, lacrimal duct, the Harderian gland and the palate (according to material obtained in present study and description provided by Parsons [23]. The main olfactory system tend to be sensitive to the volatile molecules (green arrows) in contrast to less volatile molecules (blue arrows) detected by the accessory olfactory system. b Scanning electron micrograph of palate of the grass snake embryo at developmental stage XI. White arrow indicates the putative position of the palatal opening of the left vomeronasal organ duct. Abbreviations: CH choana, DV duct of the vomeronasal organ, EN external naris, HG Harderian gland, LD lacrimal duct, NC nasal cavity, MPT median palatal trough, VNO vomeronasal organ, VR vomerine raphe

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Frontiers in Zoology

ISSN: 1742-9994