Structurally the ethmoid forms part of the cranial floor the medial wall of the orbits eye sockets part of the nasal septum and part of the sidewalls of the nasal cavity.
Cranial floor unlabeled.
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Or temporal squama pars squamosa.
A small area of the ethmoid bone consisting of the crista galli and cribriform plates is located at the midline of this fossa.
The sphenoid bone is a butterfly shaped cranial bone that is located in the middle of the skull between the frontal and temporal bones.
Skull cranial floor bone markings part 2 temporal bone.
Since the brain occupies these areas the shape of each conforms to the shape of the brain regions that it contains.
The anterior cranial fossa is located between the frontal bone and lesser wing of the sphenoid bone.
This bone articulates with the sphenoid anteriorly and the occipital bone posteriorly.
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The various portions contribute to the floor of the middle cranial fossa and a part of the posterior cranial fossa and has an important relationship.
Inside the skull the floor of the cranial cavity is subdivided into three cranial fossae spaces which increase in depth from anterior to posterior see figure 4 figure 6b and figure 9.