CROSECTIONAL TRANSVERSAL 18



1 Nasal bone
2 Nasal septum
3 Superior nasal concha
4 Maxilla (with infra-orbital canal)
5 Levator labii superioris muscle
6 Medial wall of maxillary sinus
(with maxillary hiatus)
7 Orbicularis oris muscle
8 Vomer (sphenoidal bone) 

9 Nasolacrimal duct

10 Pharyngotympanic tube (auditory tube)
11 Maxillary sinus
12 Masseter muscle
13 Zygomatic bone and zygomaticus muscles
14 Lateral pterygoid muscle (superior and inferior heads)
15 Temporal muscles
16 Pharyngeal recess
17 Medial pterygoid muscle
18 Head of mandible
19 Pterygoid process (medial and lateral plates)
20 Sphenoidal bone (tip)
21 Mandibular nerve and auriculotemporal nerve
22 Internal carotid artery
23 Tensor veli palatini muscle
24 Clivus
25 Levator veli palatini muscle
26Internal jugular vein (bulb)
27 Longus capitis muscle
28 Vagus (X) and accessory (XI) nerves
29 Glossopharyngeal nerve (IX)
30 Vertebral artery
31 Mastoid cells
32 Medulla oblongata
33 Hypoglossal nerve (XII)
34 Sigmoid sinus
35 Hemisphere of cerebellum (posterior lobe)
36 Fourth ventricle (medial aperture)
37 Falx cerebelli with occipital sinus
38 Tonsil of cerebellum
39 Semispinalis capitis muscle
40 Occipital bone