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Lobes of the brain + intracranial disorders Cheat Sheet by

Lobes of the brain + intracranial disorders

Lobes of the brain

Types of Intrac­ranial disorders

Cerebr­ova­scular damage
Blood disorders
Arteri­ovenous Malfor­mations
Intrac­ranial Tumours
Intrac­ranial infection
Post trauma


Suprat­ent­orial Tumours
Infrat­ent­orial Tumours
Raised ICP + brain shift S&S
Raised ICP + brain shift S&S
Tentorial herniation then tonsillar herniation
S&S of CSF outflow blockage
Causes tonsilliar herniation
VI Nerve Palsy - BS pushed downwards, stretches VI nerve over petrous tip Unreliable sign
Extradural haematoma:
Pushes on hemisphere sideways under Falx, downwards through tentorium
Stretches CN III over edge of the tentorium - unilateral III nerve palsy reliable sign

Occipital Lobe Functional areas

Visual Associ­ation areas
Main Visual cortex
Calcarine fissure (medially in right hemisp­here)

Occipital Lobe Lesions

Seizures with flashing light Aura
Visual Field Defects
Visual Agnosia (cannot recognise visual inform­ation)

Parietal lobe Lesions (EITHER)

Sensory Seizures
Soft Motor signs
Visual pathway Distur­bance
Postural Sensation disturbed
Decreased Passive Joint Movement Sense
Touch Locali­sation Disturbed
2 pt Discri­min­ation disturbed
Apprec­iation of size + texture Disturbed
Perceptual Rivalry
Altered Optokinetc nystagmus
Perceptual Rivalry: When presented with two images, instead of them being superi­mposed, the images appear separately
Optoki­netic nystagmus: Following an object when stationary (larger visual field, occulo­motor response and directs image onto the retina, compared to small moving visual objects, directs image onto fovea in smooth pursuit)

Parietal Lobe Lesions (RIGHT & LEFT)

Anosog­nosia - no longer aware of opposite side
Confusion of right and left limb
Dyspraxia - loss of acquired skills
Finger agnosia
Distur­bance of Geographic Memory
Wernickes dysphagia
Werkni­cke's dysphagia- loss of produc­tio­n/c­omp­reh­ension of spoken &/or written language (acquired)

Frontal Lobe

Functional areas:
Olfactory Bulb, tract + optic nerve
Frontal Poles
Cingulate Gyrus
Frontal eye fields
Corticol control of mictur­ition (urina­tion)
Corpus Callosum
Motor cortexes
Rolandic fissure (fissure between occupital + frontal lobe)
Sylvian Fissue (fissure between temporal + frontal lobe)
Broca's area

Frontal lobe Lesions:

Loss of drive
Decreasing concern about personal appear­ance, hygiene, family affairs, business
Memory problems
Diminished intellect
Focal, motor
Adversive (includes eyes)
Status Epilep­ticus (seizure lasting 10 minutes or more)
Possible Temporal lobe attacks due to its close proximity
Frontal lobe - person­ality, acquired social behaviour

More Symptoms

Weakness on opposite side of face and/body
If parasa­gittal, legs are affected bilate­rally
Loss of mictur­ition (urge incont­inence)
Speech Distur­bance - Dysphagia (Broca's)
Visual Distur­bance - in visual and or acuity
Alteration in smell


Intell­ectual impairment
Memory Defect
+ve Grasp Reflex
Contra­lateral UMNL signs
Unilateral anosmia
Visual pathway deficits
Dysphasic signs

Temporal Lobe functional areas:

Unicinate fasciculus (connects uncus to orbital frontal cortex)
Inferior longit­udinal fasciculus (to visual associ­ation areas)
Motor fibres entering cerebral peduncles

Temporal Lobe Lesions

Epileptic - complex partial seizures "­on/­off­"
Complex Autono­misms :
Repeated fiddling with clothing
Walkin­g/d­riving then "­waking up"
Visual­/au­dit­ory­/sm­ell­s/taste halluc­ina­tions
Unpleasant visceral sensations
"­Som­ething awful is about to happen­"
Deja vu
Jamais vu
Deja vu:- described as a strong sensation that a current event has happen­ed/­occ­urred before
Jamais vu: - opposite to deja vu. Something that has happened in a person's life but they have the feeling it happened for the first time.


great cheat sheet. quick question: do you know how to delete/erase/remove DRAFT cheat sheets. i.e. sheet that I dont want to publish and want to remove them from my DRAFT sheets.

Thank you!

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