What happens if internal capsule is damaged?
Damage to this area can affect functions like speaking, chewing, and swallowing. As a result, individuals may struggle to swallow (dysphagia), have difficulty with eating, and/or struggle with speech (dysarthria and other motor speech disorders) after an internal capsule stroke.
What is a stroke affecting the internal capsule?
An internal capsule stroke is caused by interruption of blood supply in the middle cerebral artery (MCA) or one of its small branches. An ischemic internal capsule stroke is caused by an embolic blood clot coming from elsewhere in the body and blocking one of the small branches of the MCA.
Are stroke symptoms contralateral or ipsilateral?
A stroke in this vascular distribution often results in contralateral paralysis or weakness (hemiparesis/hemiplegia), sensory loss and visual field loss (homonymous hemianopsia) (Adams, 1997). Middle cerebral artery involvement is very common while anterior cerebral artery strokes are less common (Teasell, 1998).
What runs through internal capsule?
The internal capsule is a white matter structure situated in the inferomedial part of each cerebral hemisphere of the brain. It carries information past the basal ganglia, separating the caudate nucleus and the thalamus from the putamen and the globus pallidus.
What is contralateral hemiplegia?
Contralateral hemiplegia This refers to paralysis on the opposite side of the body that brain damage occurs in.
What is contralateral stroke?
Effects of a complete MCA stroke contralateral (opposite-side) sensory loss in the same areas. contralateral homonymous hemianopia—visual-field deficits affecting the same half of the visual field in both eyes.
What is the internal capsule made up of?
The internal capsule (IC) is a white matter structure composed of bundles of myelinated fibers that course past the basal ganglia. It is located in the inferomedial portion of each cerebral hemisphere and separates the caudate nucleus and thalamus from the lentiform nucleus.
Does the internal capsule have a sensory component?
The internal capsule, a white matter structure, is a unique location where a large number of motor and sensory fibers travel to and from the cortex.
What is contralateral hemiplegic stroke?
The commonest clinical presentation of acute stroke in the middle cerebral artery territory is contralateral hemiplegia. Weakness of upper and lower limbs, facial paresis and gaze palsy are well known clinical findings in hemiplegic stroke.
How does a stroke to the internal capsule affect motor function?
Since both motor and sensory fibers are carried in the internal capsule, a stroke to the posterior limb of the internal capsule (where motor fibers for the arm, trunk and legs and sensory fibers are located) can lead to contralateral weakness and contralateral sensory loss.
What causes contralateral hemiplegia in alexia without agraphia?
Thalamic involvement may cause contralateral sensory loss (ventroposterolateral nuclei). Uncommonly, may cause contralateral hemiplegia (due to involvement of the internal capsule). Alexia without agraphia (patients are able to write but not read).
What is an internal capsule infarct?
Clinical Findings in Internal Capsular Stroke. Known as one of the classic types of lacunar infarcts, a pure motor stroke is the result of an infarct in the internal capsule. Pure motor stroke caused by an infarct in the internal capsule is the most common lacunar syndrome.