V. Velum palati in section.
W. Inferior spongy bone.
X. Middle spongy bone.
Y. Crista galli of oethmoid bone.
Z. Frontal sinus.
2. Anterior cartilaginous part of nasal septum.
3. Nasal bone.
4. Last molar tooth of the left side of lower jaw.
5. Anterior pillar of the fauces.
6. Posterior pillar of the fauces.