Figure 3: (A-J) Region of the vomeronasal organ (VO) of equine fetuses at 60 days. (A) Observe the nasal septum (NS) consisting of hyaline cartilage and the region of the oral cavity (OC). (A-C) Olfactory epithelium (OE) is found in the region of the nose and the vomeronasal organ. In the region of the triangle, there is a high olfactory epithelium pseudostratified structure, with specialized cells. (D-E) Transversal sinus cut of an equine embryo at 64 days. Note the venous plexus (VPl) of the nasal concha, dorsal nasal concha (DNC), ventral nasal concha (VNC), nasal septum (NS) consisting of cartilage, and vomeronasal organ (VO). (F-J) Development of the larynx during days 26-45 of gestation. (F) Ventral view of the cervical region of the equine fetus at 115 days of gestation. Observe the structures of the larynx: cricoarytenoid muscle (CrM), thyroid (Th), trachea (Tr), and thyroid gland (ThG). (G) Scanning electron microscopy of the oral cavity showing the protrusion of the cartilage of the epiglottis (Ep) and the larynx in relation to the tongue (To). (H-I) Histology of the pharyngeal region in embryos at 30 days of gestation, in which the cricoid cartilage (CC), thyroid (Th), trachea (Tr), epiglottis (Ep), esophagus (Es), and tongue (To) are seen. (J) Scanning electron microscopy of the oral cavity (OC) in fetuses at 45 days of gestation: hard palate (HP), soft palate (SP), choana (Co), nasopharynx (Np), oropharynx (Op); lingopharynx (Lp), nasal septum (NS), epiglottis (Ep), and cricoid cartilage (CC).