Internal Capsule-Anatomy
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INTERNAL CAPSULE(PARTS AND RELATIONS)
MARYAM JAMILAH BINTI ABDUL HAMID082013100002
IMS BANGALORE
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Coronal sectional of the brainSuperior
Inferior
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Relations
Transverse section
Medially:-Head of caudate nucleus-Thalamus
Laterally: Lentiform nucleus (globus pallidus & putamen)
Ant.
Med. Lat.
Post.
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Upwards: corona radiataDownwards: crus cerebri of the midbrain
Sup.
Ant. Post.
Inf.
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PARTS
1. Anterior limb
2. Posterior limb
3. Genu
4. Retrolentiform part
5. Sublentiform part
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Ant.
Med. Lat.
Post.
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Sup.
Post. Ant.
Inf.
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MRI
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Why do we need to learn about internal capsule?
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Ant.
Med. Lat.
Post.
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PART DESCENDING TRACTS ASCENDING TRACTS
Anterior limb Frontopontine fibresAnterior thalamic radiation(fibres from ant. & med. nuclei of thalamus)
GenuCorticonuclear fibres(a part of pyramidal tract; motor nuclei of cranial nerves)
Ant. part of superior thalamic radiation(fibres from post. ventral nucleus of thalamus)
Posterior limb
a) Corticospinal tract (pyramidal tract; upper limb, trunk & lower limb)
b) Corticopontine fibresc) Corticorubral fibres
a) Superior thalamic radiationb) Fibres from globus pallidus to subthalamic nucleus
Retrolentiform parta) Parietopontine &
occipitopontine fibresb) Fibres from sup. colliculus &
pretectal region
Posterior thalamic radiation:-a) Optic radiation (mainly)b) Fibres connect thalamus
to parietal & occipital lobes (partly)
Sublentiform parta) Parietopontine &
temporopontine fibresb) Fibres between temporal lobe
& thalamus
a) Auditory radiationb) Fibres connect thalamus to temporal lobe
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REFERENCES
• Chaudrasia Volume III, Edition 6th
• https://
www.youtube.com/watch?v=qLz7w5ow8uw
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THANK YOU ~~~