Skull Base: Difference between revisions
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{{NoteBox|secondary}}<strong>Related pages</strong> | |||
* [[Cranial Foramina]]{{NoteBoxEnd}} | |||
'''Internal Features of Base of Skull:''' | '''Internal Features of Base of Skull:''' | ||
Divided into anterior, middle, and posterior cranial fossae | Divided into anterior, middle, and posterior cranial fossae | ||
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* Internal occipital crest—divides posterior fossa into two lateral cerebellar fossae | * Internal occipital crest—divides posterior fossa into two lateral cerebellar fossae | ||
* Grooves for transverse and sigmoid dural venous sinuses | * Grooves for transverse and sigmoid dural venous sinuses | ||
* Jugular | * [[Jugular foramen]]—transmits sigmoid sinus (internal jugular vein) and several [[cranial nerves]] | ||
* [[Internal acoustic meatus]]—anterior and superior to [[jugular foramen]], transmits facial and vestibulocochlear nerves (CN VII and CN VIII) | * [[Internal acoustic meatus]]—anterior and superior to [[jugular foramen]], transmits facial and vestibulocochlear nerves (CN VII and CN VIII) | ||
* Hypoglossal canal—anterolateral and superior to foramen magnum, transmits the hypoglossal nerve (CN XII) | * Hypoglossal canal—anterolateral and superior to foramen magnum, transmits the hypoglossal nerve (CN XII) | ||
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[[Category:Neuroanatomy]] | [[Category:Neuroanatomy]] | ||
Latest revision as of 14:20, 3 March 2024
Related pages
Internal Features of Base of Skull: Divided into anterior, middle, and posterior cranial fossae
3D models
Anterior cranial fossa
- Contains frontal lobe of brain
- Formed by frontal bone anteriorly, ethmoid bone medially, and lesser wing of sphenoid bone posteriorly
Features
- Frontal crest—midline bony extension of frontal bone
- Foramen cecum—foramen at base of frontal crest
- Crista galli—midline ridge of bone from ethmoid posterior to foramen cecum
- Cribriform plate—thin, sievelike plate of bone on either side of crista galli, which transmits olfactory
Middle cranial fossa
- Contains temporal lobe, hypothalamus, and pituitary gland
- Formed by greater wing and body of sphenoidal bone, petrous temporal bone, lesser wing of sphenoidal bone
Features
- Sella turcica—central depression in the body of the sphenoid bone for pituitary gland
- Tuberculum sellae—swelling anterior to sella turcica
- Dorsum sellae—crest on the body of the sphenoid bone posterior to sella turcica
- Anterior clinoid processes—medial projections of lesser wings of sphenoidal bones
- Posterior clinoid processes—swelling at either end of dorsum sellae
- Foramen lacerum (one on each side)—jagged opening closed by plate of cartilage in life, transmits nothing
Contains four foramina in a crescent on either side in the body of the sphenoidal bone
- Superior orbital fissure
- Foramen rotundum
- Foramen ovale
- Foramen spinosum
Posterior cranial fossa
- Contains cerebellum, pons, and medulla oblongata
- Composed largely of occipital bone, body of sphenoidal bone, petrous, and mastoid parts of temporal bone
Features
- Foramen magnum—transmits spinal cord
- Internal occipital crest—divides posterior fossa into two lateral cerebellar fossae
- Grooves for transverse and sigmoid dural venous sinuses
- Jugular foramen—transmits sigmoid sinus (internal jugular vein) and several cranial nerves
- Internal acoustic meatus—anterior and superior to jugular foramen, transmits facial and vestibulocochlear nerves (CN VII and CN VIII)
- Hypoglossal canal—anterolateral and superior to foramen magnum, transmits the hypoglossal nerve (CN XII)