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Internal Capsule (Anatomy descriptions) -parts (anterior limb, genu, posterior limb, sublentiform nucleus, retrolentiform nucleus) -tracts (afferents and efferents passing each part) - a video
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INTERNAL CAPSULE(PARTS AND RELATIONS)
MARYAM JAMILAH BINTI ABDUL HAMID082013100002
IMS BANGALORE
Coronal sectional of the brainSuperior
Inferior
Relations
Transverse section
Medially:-Head of caudate nucleus-Thalamus
Laterally: Lentiform nucleus (globus pallidus & putamen)
Ant.
Med. Lat.
Post.
Upwards: corona radiataDownwards: crus cerebri of the midbrain
Sup.
Ant. Post.
Inf.
PARTS
1. Anterior limb
2. Posterior limb
3. Genu
4. Retrolentiform part
5. Sublentiform part
Ant.
Med. Lat.
Post.
Sup.
Post. Ant.
Inf.
MRI
Why do we need to learn about internal capsule?
Ant.
Med. Lat.
Post.
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
REFERENCES
• Chaudrasia Volume III, Edition 6th
• https://
www.youtube.com/watch?v=qLz7w5ow8uw
THANK YOU ~~~