INTERNAL CAPSULE

AMUTHAMEENA MANOHARAN

THIAGGU PALAN

JAYAGANTHAN MANAUGAR

MOHD ZAHIR

HIGHLIGHTS…

INTRODUCTION PARTS OF INTERNAL CAPSULE BLOOD SUPPLY

WHITE MATTER OF CEREBRAL HEMISPHERE Association tracts (fibers)- different

regions in cerebral cortex

Projection tracts (fibers)- cerebral cortex other masses of gray matter

Commissures fibers- R L

This is a compact bundle of fibres through which the large collections of fibres pass

PARTS OF INTERNAL CAPSULE1. ANTERIOR LIMB

- Caudate nu. & lentiform nu.

2. GENU3. POSTERIOR LIMB

- Thalamus & lentiform nu.

4. RETROLENTIFORM5. SUBLENTIFORM

COMPONENTS ANTERIOR LIMB

Anterior thalamic radiation Frontopontine

GENU Part of superior thalamic radiation Frontopontine Corticonuclear

POSTERIOR LIMB Superior thalamic radiation Frontopontine Corticonuclear (corticobulbar) Corticospinal Extrapyrimidal

RETROLENTIFORM Post thalamic radiation - Optic radiation Parieto-pontine Temporo-pontine

SUBLENTIFORM Inf thalamic radiation - Auditory radiation

Thalamocortical fibres

Corticopontine fibres

Corticonuclear &corticospinal fibres

Connections:ANTERIOR LIMB

Anterior thalamic radiation Frontopontine

GENUPart of superior thalamic radiationFrontopontineCorticonuclear

– RETROLENTIFORM• Optic radiation• Parieto-pontine• Temporo-pontine

– SUBLENTIFORM• Auditory radiation

POSTERIOR LIMBSuperior thalamic radiationFrontopontineCorticonuclear (corticobulbar)CorticospinalExtrapyrimidal

BLOOD SUPPLY

Lateral striate fr middle cerebral artery Ant limb Genu Post limb Basal ganglia

Medial striate fr anterior cerebral artery Ant limb Genu Basal ganglia

Ant choroidal fr internal carotid Post limb Retrolenticular part

Anterior choroidal A

Middle cerebral A

Anterior cerebral A

Internal carotid A

Internal capsule

Lenticulostriate arteries

Middle cerebral arteryInternal carotid artery

Anterior cerebral artery

Medialstriate arteries

CORONAL SECTION

Left middle cerebral artery

Rightmiddle cerebral artery

MedialstriateACA

Lateralstriate- MCA

CORONAL SECTION

*Anterior choroidal A

Middle cerebral A

Anterior cerebral A

Medial striate - ACA

REFERENCE1. Dr. Israa lecture note2. Clinical neuroanatomy snell3. Human neuroanatomy inderbir singh