Lecture 5 - Space Occupying Lesions Flashcards
What is a space occupying lesion?
Abnormal tissue taking up space; can be acute or sub-acute
Name the 5 layers of the scalp
Skin, connective tissue, aponeurosis, loose connective tissue and pericranium
Why do scalp lacerations generally bleed excessively?
Scalp arteries form a rich anastomotic network just deep to the skin
Name the 4 bones of the skull which meet at the pterion
Frontal, parietal, temporal and sphenoid bones
Which artery passes deep to the pterion?
Middle meningeal artery
What is the main sensory nerve supply for the dura mater?
CNV
What is the function of arachnoid granulations?
Reabsorbs CSF
What is the tentorium cerebelli?
A tough sheet of dura mater “tenting” over the cerebellum
What is the fall cerebri composed of and what is its function?
Dura mater; separates the right and left hemispheres
Which arteries merge to form the basilar artery?
Right and left vertebral arteries
What are the immediate anterior branches of the basilar artery?
Right and left posterior cerebral arteries
Where is CSF produced?
In the choroid plexus of the ventricles
Where does the subarachnoid space end?
Level of the S2 part of the sacrum
Name the 3 different types of cranial haemorrhage
Extradural, subdural or subarachnoid
Which type of cranial herniation can result in a blown pupil?
Uncal herniation; due to compression of CNIII
