Floor of the skull Flashcards
Which bone forms the posterior boundary of the anterior cranial fossa?
Lesser wing of sphenoid
Which bone forms the anterior boundary of the middle cranial fossa?
Greater wing of sphenoid
Which bones form the floor of the middle cranial fossa?
Sphenoid Temporal bone (squamous and petrous parts)
Which four bones come together at the H-shaped suture called the pterion?
Sphenoid
Temporal
Frontal
Parietal
Which bone forms the posterior border of the posterior cranial fossa?
Occipital bone
What structures pass through the small foramina of the skull?
Nerves
Blood vessels
What goes through the foramina of the cribriform plate?
Olfactory Nerve
What goes through the optic foramen?
Optic Nerve
Ophthalmic Artery
What goes through the superior orbital fissure?
Oculomotor Nerve
Trochlear Nerve
Ophthalmic division of the trigeminal nerve
Abducens Nerve
What goes through the foramen rotundum?
Maxillary branch of the trigeminal nerve
What goes through the foramen oval?
Mandibular branch of the Trigeminal nerve
What goes through the foramen spinosum?
Middle Meningeal artery and vein
What goes through the internal acoustic foramen?
Facial Nerve
Vestibulocochlear Nerve
What goes through the jugular foramen?
Glossopharyngeal nerve
Vagus Nerve
Accessory nerve
Internal Jugular vein
What goes through the foramen magnum?
Spinal Cord
Vertebral Arteries
Where are the intra cranial venous blood sinuses found?
Between the inner and outer layers of the dura
The grooves that run laterally on both sides of the internal occipital protuberance are for what?
The transverse sinus
What are the S-shaped grooves are for what?
The sigmoid sinus
Into which foramen does the groove for the sigmoid sinus lead?
Jugular foramen
Which major vein emerges from the jugular foramen?
Internal Jugular vein
What is the sella turcica?
A deep depression in the midline in the middle cranial fossa which house the pituitary gland
In the body of which cranial bone is the sella turcica found?
Sphenoid
What do the anterior and posterior crinoid processes on each side of the sella turcica give attachment to?
Tentorium cerebelli
On either side of the sella turcica is a groove for what?
The cavernous venous (intracranial sinus)
Which foramen lies immediately anterior to the groove for the cavernous sinus?
Superior Orbital Fissure
The pterygoid plate and the pterygoid hamulus are part of which bone?
Sphenoid
What is the muscle that attaches to the medial pterygoid plate?
Superior constrictor muscle of pharynx
What muscles are attached to the lateral pterygoid plate?
Pterygoid muscles (medial and lateral)
