Skull and Cranial Cavity Flashcards
What are the 4 projections of the temporal bone?
styloid process, mastoid process, zygomatic process, petrous part
What are the sutures of the cranial cavity?
sagittal, coronal and lambdoid
What bones is the pterion between?
temporal, parietal, frontal, sphenoid
What is the ridge in the ethmoid bone called?
crista galli
What is the gap between the greater and lesser wing of sphenoid?
superior orbital fissure
Where is the optic canal?
between the body of the sphenoid and the lesser wing
What are the 3 foramen in an arc in the middle cranial fossa?
foramen rotundum, foramen ovale, foramen spinosum
What is the foramen lacerum?
The 6th foramen in the middle cranial fossa - nothing goes through it
What goes through the foramen spinosum?
the middle meningeal artery
What are the 4 foramina in the posterior cranial cavity?
internal auditory meatus, jugular foramen and hypoglossal canal and the foramen magnum
Where is the internal auditory meatus?
in the petrous part of the temporal bone
Where is the jugular foramen?
between the petrous part of the temporal bone and the occipital bone
Where is the hypoglossal canal?
in the occipital bone
What is the emissary vein?
A vein that drains blood from the scalp to the dural sinuses
What is the diploic vein?
Drains the diploe (spongy layer) of the skull in to the dural sinuses
What are the attachments of the falx cerebri?
crista gali and internal occipital protruberence
What is the diaphragma sellae?
The dura covering the turkish saddle in the body of the sphenoid
What is the falx cerebri?
the dural projection in the midline between the hemispheres of the cerebrum
What is the tentorium cerebelli?
The dural projection between the cerebellum and the cerebrum
What is the falx cerebelli?
the dural projection in the midline between the hemispheres of the cerebellum
What is the superior sagittal sinus?
The dural venous sinus at the top of the falx cerebri
What is the inferior sagittal sinus?
The dural venous sinus at the bottom of the falx cerebri
What is the straight sinus?
The meeting point of the inferior sagittal sinus and the great cerebral vein
What are the transverse sinuses?
The dural venous sinuses at the attachment of the tentorium cerebelli
What are the sigmoid sinuses?
The dural venous sinuses that snake down from the transverse sinuses to the jugular foramen along the edge of the middle cranial fossa
What is the cavernous sinus?
the dural venous sinuses that are either side of the body of the sphenoid
What is the middle meningeal artery a branch of?
the maxillary artery
When is the middle meningeal artery at risk?
in a fracture of the pterion
What are the branches of the middle meningeal artery?
anterior and posterior
