Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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Floor of cranial cavity

Structures inferior to anterior and middle cranial fossae

Bone has been removed to expose structures underlying the floor of the anterior part of the cranial vault.

1 .	Mucosa of frontal sinus
2 .	Orbital part of frontal bone
3 .	Position of anterior ethmoidal foramen (opened)
4 .	Olfactory bulb
5 .	Periorbita
6 .	Mucosa of ethmoidal cell (posterior)
7 .	Position of maxillary sinus (in depths of view)
8 .	Maxillary nerve (V)
9 .	Oculomotor nerve (III)
10 .	Part of pterygoid venous plexus
11 .	Deep temporal nerve posterior
12 .	Ophthalmic nerve (VI)
13 .	External pterygoid muscle
14 .	Abducens nerve (VI)
15 .	Crista galli
16 .	Mucosa of sphenoid sinus
17 .	Middle cranial fossa
18 .	Optic nerves (II)
19 .	Internal carotid artery (right and left)
20 .	Hypophysis (left half cut away)
21 .	Sella turcica
22 .	Dorsum sellae