Clinically Relevant Anatomy of Space Occupying Lesions Flashcards
Monro Kellie hypothesis
- -Cranial compartment is incompressible and volume inside cranium is fixed
- -Cranium and its constituents create a state of volume equilibrium, such that an increase in the volume of one constituent must be compensated for by a decrease in the volume of another
- -The principle buffers to increased volume are CSF and blood volume to a lesser extent
give an example of an acute and subacute expanding intracranial pathology
- acute - bleed
- subacute - tumour
5 layers of scalp - outside to in
- Skin
- Connective tissue
- Aponeurosis
- Loose connective tissue
- Pericranium
aponeurosis layer
tendon layer between frontalis and occipitalis muscles
why do scalp lacerations bleed excessively
scalp arteries form a rich anastomotic network
which layer are the scalp arteries found in
Connective tissue layer
which arteries form the anastomotic network in the scalp
internal and external carotid
what is the pericranium
periosteum enveloping the skull (outer membrane of bone that is responsible for bone formation)
which types of joints are sutures, and what is their purpose
fibrous, to prevent cracks spreading between different skull bones
why is the pterion a disadvantage
- thinnest part of skull (frontal, temporal, parietal and sphenoid)
- directly above middle meningeal artery
which bone is the carotid canal found in,and what goes through it
temporal bone, internal carotid artery
what gives rise to the pain of meningitis
stretching of the dura mater
nerve supply to dura mater
sensory supply from CN V
describe the structure of the dura mater
- 2 layers: outer periosteal and meningeal
- in parts these are close together
- in parts there are dural venous sinuses between them
diaphragm sellae
sheet of dura mater over the pituitary fossa, has a hole to allow the pituitary stalk through
tentorium cerebelli
dura mater sheet over the cerebellum, separating cerebral hemispheres from cerebellum
where does the tentorium cerebelli attach
to the ridges of the petrous temporal bones
falx cerebri
- midline dura mater sheet
- separates the right and left cerebral hemispheres
attachments of the falx cerebri
- crista galli of ethmoid bone anteriorly
- internal aspect of sagittal suture
- internal occipital protuberance posteriorly
internal occipital protuberance
external occipital protuberance