Anatomy - Space Occupying Lesions Flashcards
what are the five layers of the scalp from superficial to deep?
skin connective tissue aponeurosis loose connective tissue pericranium
which layer of the scalp contains the named arteries of the scalp?
connective tissue
what helps prevent skull fractures from spreading?
sutures
what type of joint are sutures?
fibrous joints
what is the thinnest part of the skull?
pterion
where is the pterion located?
at the junction between the frontal, parietal, temporal and sphenoid bones
what artery courses over the deep aspect of the pterion?
middle meningeal artery
what is found adherent to the internal aspect of the skull?
dura mater
what nerve supplies the dura mater?
CN V
what is the tough sheet of dura mater that forms a roof over the pituitary fossa called?
diaphragm sellae
what is the tentorium cerebelli?
a sheet of dura mater covering the cerebellum
where does the tentorium cerebelli attach?
to the ridges of the petrous temporal bones
why does the tentorium cerebelli contain a central gap?
to let the brainstem pass through
where is the confluence of the sinuses found?
in the midline of the internal occipital protuberance
what artery supplies the medial aspect of the right cerebral hemisphere?
right anterior cerebral artery
what artery supplies the posterior aspect of the right cerebral hemisphere?
right posterior cerebral artery
what artery supplies the lateral aspect of the left cerebral hemisphere?
left middle cerebral artery
name three types of bleeds that can occur in the cranial cavity
extradural haemorrhage
subdural haemorrhage
subarachnoid haemorrhage
where is an extradural haemorrhage found?
between bone and dura
what can cause an extradural haemorrhage?
ruptured middle meningeal artery
what can cause a ruptured middle meningeal artery?
trauma to the pterion
what can cause a subdural haemorrhage?
torn cerebral veins
often caused by falls in the elderly
what is a subarachnoid haemorrhage?
bleeding into the CSF of the subarachnoid space
what can cause a subarachnoid haemorrhage?
a ruptured circle of willis aneurysm
what is another name for a circle of willis aneurysm?
a berry aneurysm
