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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesNov 1511 Interior of the skullcranial fossae The floor base of the cranial cavity is divided into three cranial fossaeanterior cranial fossa A middle cranial fossa M and posterior cranial fossa P Sphenoid ridge separates A from M Petrous ridge separates M from P The middle meningeal artery is deep to the pterion These fossae are like the base of the neurocranium cranial bones As you go from A to P it gets deeper like going down stairs The sphenoid bone is partly in A and partly in M Bones of anterior cranial fossa Consists of frontal bone orbital plate ethmoid bone cribriform plate and sphenoid bone lesser wing The orbital plates are horizontal plates that the top of the orbit of the eye separate brain from eye The cribriform plate has perforations olfactory foramina that olfactory nerves travel through Crista galli runs down the middles and separates the two cribriform plates Dural folds falx cerebri are attached to the crista galli and they hold the brain in place within the cranial cavity Bones which contribute to the cranial fossae Anterior CFfrontal ethmoid sphenoid Middle CFsphenoid temporal parietal minor Posterior CFtemporal occipital parietal minor Ethmoid bone Is the deepest bone of the skull It is anterior to the sphenoid bone and posterior to the nasal bones Its superior surface has two horizontal cribriform plates that contribute to the roof of the nasal cavities and the floor of the anterior CF divides cranial and nasal cavities The cribriform plates are perforated by olfactory foramina and separating the two crib plates in the midline is the crista galli a superior projection Superior to the crib plates are the olfactory bulbs The perpendicular plate projects inferiorly in the midline and it forms the superior part of the nasal septum divides nasal cavity into left and right halves On either side of the perpendicular plate is a lateral mass which contains ethmoid sinuses Extending medially from the lateral masses are the superior and middle nasal conchae and they project into the nasal cavity The lateral surfaces of
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