The internal capsule is divided into superior and inferior parts. It is located medially between the caudate nucleus and thalamus, and laterally between the lentiform nucleus. It contains ascending and descending tracts that connect the cortex to lower brain structures. The internal capsule has anterior, genu, posterior, retrolentiform, and sublentiform parts that contain different tracts. We need to learn about the internal capsule because it is important for understanding the pathways involved in motor and sensory functions.

1. INTERNAL CAPSULE
(PARTS AND RELATIONS)
MARYAM JAMILAH BINTI ABDUL HAMID
082013100002
IMS BANGALORE

2. Coronal sectional of the brain
Superior
Inferior

3. Relations
Transverse section
Medially:
-Head of caudate
nucleus
-Thalamus
Laterally:
Lentiform nucleus
(globus pallidus &
putamen)
Ant.
Med. Lat.
Post.

4. Upwards: corona radiata
Downwards: crus cerebri of the midbrain
Sup.
Ant. Post.
Inf.

5. PARTS
1. Anterior limb
2. Posterior limb
3. Genu
4. Retrolentiform part
5. Sublentiform part

6. Ant.
Med. Lat.
Post.

7. Sup.
Post. Ant.
Inf.

8. MRI

9. Why do we need to learn
about internal capsule?

10. Ant.
Med. Lat.
Post.

11. PART DESCENDING TRACTS ASCENDING TRACTS
Anterior limb Frontopontine fibres
Anterior thalamic radiation
(fibres from ant. & med.
nuclei of thalamus)
Genu
Corticonuclear 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 fibres
c) Corticorubral fibres
a) Superior thalamic
radiation
b) Fibres from globus pallidus
to subthalamic nucleus
Retrolentiform part
a) Parietopontine &
occipitopontine fibres
b) Fibres from sup. colliculus &
pretectal region
Posterior thalamic radiation:-
a) Optic radiation (mainly)
b) Fibres connect thalamus
to parietal & occipital
lobes (partly)
Sublentiform part
a) Parietopontine &
temporopontine fibres
b) Fibres between temporal lobe
& thalamus
a) Auditory radiation
b) Fibres connect thalamus to
temporal lobe

13. REFERENCES
• Chaudrasia Volume III, Edition 6th
• https://www.youtube.com/watch?v=qLz7w5o
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14. THANK YOU ~~~