Download MBBS Anterior Circulation of Brain Lecture PPT

CIRCLE OF WILLIS

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Anterior circulation:

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Originating from Internal Carotid Artery
1)
Middle Cerebral Artery
2)
Anterior Cerebral Artery

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3)
Anterior Choroidal Artery.

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MIDDLE CEREBRAL ARTERY

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Lenticulostriate vessels ?
A) Internal Capsule
B) Caudate Nucleus
C) Putamen
D) Globus Pallidus

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Occlusion of these vessels can result
in:
Hemiplegia C/L
Hemisensory loss
Homonymous hemianopia

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UMN Facial palsy

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In a lenticulostriate occlusion, if caudate and putamen

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are affected, there can be Parkinsonian features as
well.
M2 branch- lies in the Sylvian fissure, divides into
TOTAL MCA OCCLUSION:
superior and inferior divisions.

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Dominant Lobe:
Occlusion of Superior division- Brocas Aphasia
C/L HEMIPLEGIA
with weakness.
C/L HEMISENSORY LOSS

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HOMONYMOUS HEMIANOPIA
Occlusion of Inferior division- Wernickes aphasia
UMN FACIAL PALSY
without weakness.
GLOBAL APHASIA WITH WEAKNESS

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Occlusion of stem of M2- Global aphasia with
weakness
Non Dominant-
HHH +7th Nerve UMN palsy+ Visuospatial
disorientation+ Dressing apraxia+Constructional

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apraxia+ Hemispatial eglect

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ANTERIOR CEREBRAL ARTERY- DIVIDES INTO A1 AND
A2.

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A1 SUPPLIES ANTERIOR LIMB OF
A2 SUPPLIES MEDIAL SURFACE OF
IC,
FRONTAL CORTEX.
ANTERIOR CAUDATE NUCLEUS

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Its occlusion is definitely
ANT. HYPOTHALAMUS
symptomatic!
Its occlusion is usual y
C/L WEAKNESS, AFFECTING LEGS

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asymptomatic.
MOSTLY.
GAIT APRAXIA (ANTERIOR
CINGULATE GYRUS)
URINARY INCONTINENCE

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(PARACENTRAL LOBULE LESION)
FRONTAL RELEASE REFLEXES.

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ANTERIOR CHOROIDAL ARTERY- SMALL ARTERY THAT

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COMES FROM ICA.
Supplies: Posterior limb of Internal
Capsule (lower part).
Remember, that most of the
supply to IC is via the

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lenticulostriate arteries. So even if
there is occlusion to Ant.
Choroidal arteries, mild symptoms
are seen atmost.
Symptoms are usual y- HHH

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syndrome.

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