internal capsule-anatomy

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 ~~~