Internal Capsule Flashcards
Internal capsule
Broad projection fibers bundle
Site
- Lies between lentiform nucleus (lateral) and caudate head and thalamus (medial)
- Almost completely divides corpus striatum into 2 parts
- Continuous above with corona radiata and below with basis pedunculi of midbrain cerebral peduncles
Shape
In horizontal section, it has V shaped appearance:
1. Short anterior limb
2. Apex (genu)
3. Longer posterior limb
4. Retro-lenticular part
5. Sub-lenticular part
Short anterior limb site
Lies between lentiform nucleus (lateral) and caudate nucleus head (medial)
Short anterior limb contents
- Fronto-pontine fibers
- Anterior thalamic radiation
Genu site
- Angle at junction of anterior and posterior limbs
- Fits into interval between caudate head (in front) and thalamus (behind)
Genu contents
Cortico-nuclear fibers
Longer posterior limb site
Lies between lentiform nucleus (lateral) and thalamus (medial)
Longer posterior limb contents
- Frontopontine fibers
- Corticospinal fibers
- Corticorubral fibers
- Corticostriate fibers
- Superior thalamic radiation
Retrolenticular part site
Lies behind lentiform nucleus
Retrolenticular part contents
- Optic radiation
- Parietopontine fibers
- Occipitopontine fibers
Sublenticular part site
Lies below lentiform
Sublenticular part contents
- Auditory radiation
- Temporopontine fibers
Blood supply
- Anterior cerebral artery
- Middle cerebral artery
- Anterior choroidal artery
Anterior cerebral artery supply
Posterior part of anterior limb is supplied by the central branches
