Applied aspect of internal capsule

internal capsule

1. APPLIED ASPECT OF INTERNAL CAPSULE NAME : NUR FARRA NAJWA BT ABDUL AZIM MATRIC NO : 082015100035

2. OBJECTIVES Students should be able to know the applied aspect of internal capsule Cause Treatments Symptoms

3. INTRODUCTION The lenticulostriate arteries supply a substantial amount of the internal capsule. These small vessels are vulnerable to narrowing in the setting of Chronic hypertension And can result in Small, punctate  infarctions or intraparenchymal haemorrhage due to vessel rupture.

4. INTRODUCTION Lesions of the genu of the internal capsule affect fibers of the  corticobulbar tract. The primary motor cortex sends its axons through the posterior limb of the internal capsule. Lesions, therefore, result in a contralateral   hemiparesis  or  hemiplegia . While symptoms of weakness due to an isolated lesion of the posterior limb can initially be severe, recovery of motor function is sometimes possible due to spinal projections of premotor cortical regions that are contained more rostrally in the internal capsule.

5. Charcot–Bouchard aneurysm Microaneuryms Usually developin the lenticulo -striate branches of middle cerebral arteries due to hypertension. The rupture of these aneurysms is a common cause of hemorrhage and contralateral hemiplegia of the body.

6. Thrombosis Recurrent branch of anterior cerebral artery causes paresis of contralateral lower face and upper limb Anterior choroidal artery may present as contralateral hemparesis and homonymous hemianopia .

7. SIGN AND SYMPTOMS Weakness of the face, arm, and/or leg (pure motor 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 .

8. Upper motor neuron signs Hyperreflexia , babinski sign, hoffman present, clonus , spasticity Mixed sensorimotor stroke 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 

9. SUMMARY

10. REFERENCES BD Chaurasia’s , HUMAN ANATOMY, regional and applied dissection and clinical, volume 3, head and neck, brain http:// stanfordmedicine25.stanford.edu/the25/ics.html

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