Cranial Fossa Anatomy: Key Landmarks and Detailed Overview | Novice Medic
Description:
Explore the intricate anatomy of the cranial fossa in this comprehensive lecture. Learn about the anterior, middle, and posterior cranial fossae, their boundaries, and the critical landmarks within each region. This video simplifies complex anatomical structures for easy understanding, catering to medical students and professionals alike. Understand how the cranial fossa relates to neuroanatomy and clinical significance, with insights to help in exams and practical scenarios.
Whether you're revising for exams or brushing up on anatomy, this video ensures you grasp the essential details of the cranial fossa anatomy and its landmarks.
Key Points Covered:
Anterior Cranial Fossa: Landmarks and structures.
Middle Cranial Fossa: Important foramina and associated nerves/vessels.
Posterior Cranial Fossa: Key landmarks and clinical relevance.
Overview of fossae boundaries and related structures.
Clinical significance and conditions associated with the cranial fossae.
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Anterior cranial fossa
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The anterior cranial fossa (Latin: fossa cranii anterior) lies at the highest level of the internal cranial base and is formed by the cribriform plate of the ethmoid bone, the orbital plate of the frontal bone, and the lesser wings of the sphenoid.
The anterior cranial fossa is bounded anteriorly and laterally by the frontal bone, inferiorly by the orbital plate of the frontal bone, the cribriform plate, and crista Galli of the ethmoid bone, and by the lesser wings and the anterior aspect of the body of the sphenoid.
Borders
The borders of the anterior cranial fossa are the following:
anterior and lateral: the inner surface of the frontal bone;
posteromedial: limbus of the sphenoid bone;
posterolateral: lesser wings of the sphenoid bone;
inferior: an orbital plate of the frontal bone, cribriform plate and crista Galli of the ethmoid bone, anterior aspects of the body, and lesser wings of the sphenoid bone.
Contents
The anterior cranial fossa contains the following parts of the brain:
the frontal lobe of the cerebral cortex,
olfactory bulb,
olfactory tract,
orbital gyri.
Openings
There are several openings connecting the anterior cranial fossa with other parts of the skull, and these are the following:
anterior ethmoidal foramen,
cribriform foramina.
The paired anterior ethmoidal foramen connects the anterior cranial fossa with each orbit and transmits the anterior ethmoidal artery, nerve, and vein.
The cribriform foramina are the openings in the cribriform plate of the ethmoid bone, which connect the anterior cranial fossa with the nasal cavity and transmit the olfactory nerves.
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Easy tips, tricks, and mnemonics to learn and remember the cranial foramina and their contents including the cribriform plate, optic canal, superior orbital fissure, foramen lacerum, spinosum, rotundum, ovale, internal acoustic meatus, jugular foramen, condylar foramen, hypoglossal canal, and foramen magnum.
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