11 Respiratory system Nasal cavity External skin (nose) with epidermis, hair, sweat glands and sebaceous glands Subcutis Nasal cartilage Stratified squamous epithelium with serous glands and vessels in t ela submucosa Nasal vestibule, young dog. H.E stain; x40. Nasal opening Mucosa of nasal vestibule with markedly papillated stratified squamous epithelium (partial section of hyaline cartilage in deeper portion) Subcutis External skin with sinus hair Nasal vestibule, young dog. H.E stain; x40. Respiratory mucosa with goblet cells Individual nasal glands with secretory ducts Submucosal venous network Periosteum Bony foundation of nasal concha with ossified islets (intramembranous ossification) and hyaline cartilage remnants Respiratory mucosa with goblet cells Nasal concha, young dog. H.E. stain; x100. 11 Respiratory system Nasal cavity Respiratory mucosa with goblet cells Individual nasal glands with secretory ducts Submucosal venous network Cartilaginous foundation of nasal concha Individual nasal glands with secretory ducts Nasal concha, calf. H.E. stain; x40. Respiratory mucosa with goblet cells Individual nasal glands with secretory ducts Submucosal venous network Perichondrium Cartilaginous foundation of nasal concha Nasal concha, calf. H.E. stain; x100. Free surface of respiratory mucosa with cilia and mucous remnants Pseudostratified columnar epithelium Endoepithelial, alveolar mucous gland cells Lamina propria mucosae Respiratory mucosa, nasal concha, sheep. Azan stain; x400. 11 Respiratory system Nasal cavity Fila olfactoria Fila olfactoria Multipolar nerve cells in olfactory bulb Fila olfactoria, cat. Azan stain; x100. Olfactory mucosa Nuclei of sustentacular cells Nuclei of sensory cells Subepithelial vascular network Fila olfactoria Tubuloacinar, branched, serous glands Olfactory mucosa, cat. Azan stain; x200. Free surface of olfactory mucosa with sensory cilia Nuclei of sustentacular cells Nuclei of sensory cells (bipolar neurons) Nuclei of basal cells Subepithelial vascular network Tubuloacinar, branched, serous glands Fila olfactoria Olfactory mucosa, cat. Azan stain; x380. 11 Respiratory system Nasal cavity Free surface of olfactory epithelium Nuclei of sustentacular cells Nuclei of sensory cells (bipolar nerve cells) Nuclei of basal cells Subepithelial vascular network Tubuloacinar, branched, serous glands Olfactory mucosa, dog. H.E. stain; x40. Olfactory mucosa Subepithelial vascular network Hyaline nasal cartilage with vascular networks Olfactory mucosa, young goat. H.E stain; x200. Free surface of olfactory mucosa with sensory cilia and mucous remnants Nuclei of sensory cells (bipolar neurons) Nucleus of sustentacular cell Nuclei of basal cells Tubuloacinar, branched, serous glands Olfactory mucosa, goat. Bodian stain; x480..