The floor of the cranial cavity increases in depth from front to back and is divided into three cranial fossae.
Cranial floor unlabeled.
Using the interactive image identify each of the following parts of the ethmoid which are too small to observe in your dissection.
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.
The floor of the middle cranial fossa and part of the posterior cranial fossa is formed by the temporal bone.
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This bone articulates with the sphenoid anteriorly and the occipital bone posteriorly.
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.
Since the brain occupies these areas the shape of each conforms to the shape of the brain regions that it contains.
A small area of the ethmoid bone consisting of the crista galli and cribriform plates is located at the midline of this fossa.
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.
The anterior cranial fossa is located between the frontal bone and lesser wing of the sphenoid bone.