Floor of cranial cavity

Structures inferior to anterior and middle cranial fossae; orbit and sinuses opened

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Image #50-5
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Floor of cranial cavity
Structures inferior to anterior and middle cranial fossae; orbit and sinuses opened
Views of the dissection of the contents of the orbit from this approach are found in 54-1 ff.
1 . Frontal sinus
2 . Infundibulum leading into nasofrontal duct
3 . Upper pointer: Frontal nerve Lower pointer: Levator palpebrae superioris
4 . Posterior ethmoidal nerve (usually a branch of the ophthalmic nerve in this case the fibers accompany the trochlear nerve)
5 . Posterior ethmoidal artery in posterior ethmoidal foramen
6 . Lacrimal nerve and superior ophthalmic vein
7 . Periorbita (area of fusion with common annular tendon)
8 . Maxillary nerve (V2)
9 . Trochlear nerve (IV)
10 . Oculomotor nerve (III)
11 . Abducens nerve (VI)
12 . Vidian nerve of pterygoid canal (below floor of sphenoid sinus)
13 . Semilunar ganglion (trigeminal)
14 . Mandibular nerve (V3)
15 . Cavernous nerve plexus
16 . Ethmoidal cell (anterior)
17 . Anterior ethmoidal nerve
18 . Cribriform plate ethmoid bone
19 . Anterior ethmoidal artery (in anterior ethmoidal foramen)
20 . Ethmoidal cell (posterior)
21 . Posterior ethmoidal vein
22 . Upper pointer: Aperture of sphenoid sinus Lower pointer: Sphenoid sinus
23 . Optic nerve (ll)
24 . Internal carotid artery
25 . Upper pointer: Circular sinus Lower pointer: Hypophysis (left half removed)
26 . Sella turcica
27 . Dorsum sellae
28 . Basilar venous plexus