Damge to internal capsules - yoki

[ArchivalUser]

results in pure motor or pure sensory deficits.

I copied this statement from uw, I wonder why? thank you!

[ArchivalUser]

please answer instead of joking around even you think it is not worth to answer such a stupid question, but it will be a great help for someone else. Thanks.

[ArchivalUser]

The Middle Cerebral Arteries

These large arteries have tree-like branches that bring blood to most of the lateral cortex of each cerebral hemisphere. This means that the middle cerebral arteries supply blood to the cortical areas involved in speech, language and swallowing. The left middle cerebral artery provides Broca's area, Wernicke's area, Heschl's gyrus, and the angular gyrus with blood.

===>Also, the "head" and "neck" areas of the motor and sensory strips in both hemispheres receive their blood supply from the middle cerebral arteries. Damage to these cortical areas on either side of the brain can impair motor speech and swallowing functions.

In addition, the middle cerebral arteries provide most of the blood supply to the corpus striatum. The striatas, which are arterial branches of the middle cerebral arteries, are known as the arteries of stroke as they are the main source of blood for the internal capsule. A rupture of the lenticulo-striate artery results in bleeding usually in the region of the internal capsule.When one of these arteries is damaged, the bottleneck of fibers within the internal capsule, including the pyramidal tract, can be affected, causing many disabilities. The striatas have relatively thin walls and pressure within them is high. For this reason, they are more vulnerable to hemorrhages than to blockages.

See if this clears anything for u...

[ArchivalUser]

why it is either PURE motor or PURE sensor? thanks

[ArchivalUser]

internal capsule is divided into 3 parts since it is V shape.

1- the anterior limb of IC: which is motor.
2- the genue : motor part of the face and shoulder contralateraly.
3-posterior limb: corticospinal tract and sensory from the body.

the anterior limb supplied by aca from anterior circulation--------------pure motor.
psterior limb------------ pca from posterior circulation causing 3 H ( heminopia, hemiplegia, hemianesthesia).

the genue (knee) supplied from anterior choroidal artery which is branch from internal caroted artery and cause facial weakness and shoulder weakness.

if there is stroke in sensory of posterior limb----------------pure sensory loss
stroke in anterior limb or cortico spinal------------------pure motor

happy to answer further inquiry