INTERNAL CAPSULE
- INTERNAL CAPSULE
- Compact bundle of projection fibres
- between thalamus and
- caudate nucleus medially
- lentiform nucleus laterally
- these fibers
- fan out rostrally
- to form corona radiata
- condense caudally
- continue as crus cerebri
- types
- ascending ( corticopetal / sensory )
- descending ( corticofugal / motor )
- Blood supply
- middle cerebral artery
- anterior cerebral artery
- striate branches
- recurrent artery of heubner
- shape
- V shaped compact structure
- concavity directed laterally
- parts
- Anterior limb
- lies between
- head of caudate nucleus medially
- anterior part of lentiform nucleus
- posterior limb
- lies between thalamus medially and posterior part of lentiform nucleus
- genu
- bend between anterior and posterior limb
- retro-lentiform part
- lies behind lentiform nucleus
- sublentiform part
- lies below lentiform nucleus
- Constituent fibers
- Motor fibers ( corticofugal fibres )
- corticopontine fibres
- largest single group of projection fibers
- naming ( named according to lobe from which they arise )
- frontopontine
- numerous
- pass through anterior limb , genu and posterior limb
- parietopontine
- pass through retrolentiform part
- occipitopontine
- pass through retrolentiform part
- temporopontine
- pass through sublentiform part
- relay in ipsilateral pontine nuclei
- from ipsilateral pons to contralateral cerebellum
- pyramidal fibers
- corticonuclear
- corticospinal
- extrapyramidal fibers
- corticorubral
- corticostriate
- corticonigral
- corticopetal fibres ( sensory fibers )
- thalamocortical fibres ( thalamic radiation )
- according to direction
- anterior thalamic radiation
- connects
- anterior and dorsomedial nuclei of thalamus to frontal lobe
- passes through
- anterior limb
- superior thalamic radiation
- connects
- ventral tier of thalamic nuclei with sensory cortex of frontal and parietal lobes
- through
- anterior limb of internal capsule
- posterior thalamic radiation
- pass through
- retrolentiform part
- connects
- lateral geniculate body to primary visual cortex forming optic radiation
- inferior thalamic radiation
- pass through
- sublentiform part
- connects
- medial geniculate body with the primary auditory area of temporal lobe
- auditory radiation
| 1273 | Capsula interna | Internal capsule | ||
| 1274 | Pontes grisei caudatolenticulares | Caudolenticular grey bridges; transcapsular grey bridges | ||
| 1275 | Crus anterius | Anterior limb | ||
| 1276 | Radiatio thalami anterior | Anterior thalamic radiation | ||
| 1277 | Tractus frontopontinus | Frontopontine fibres | ||
| 1278 | Genu capsulae internae | Genu of internal capsule | ||
| 1279 | Fibrae corticonucleares | Corticonuclear fibres | ||
| 1280 | Crus posterius | Posterior limb | ||
| 1281 | Radiatio thalami centralis | Central thalamic radiation | ||
| 1282 | Fibrae corticoreticulares | Corticoreticular fibres | ||
| 1283 | Fibrae corticorubrales | Corticorubral fibres | ||
| 1284 | Fibrae corticospinales | Corticospinal fibres | ||
| 1285 | Fibrae corticothalamicae | Corticothalamic fibres | ||
| 1286 | Fibrae parietopontinae | Parietopontine fibres | ||
| 1287 | Fibrae thalamoparietales | Thalamoparietal fibres | ||
| 1288 | Pars retrolentiformis | Retrolentiform limb; retrolenticular limb | ||
| 1289 | Fibrae occipitopontinae | Occipitopontine fibres | ||
| 1290 | Fibrae occipitotectales | Occipitotectal fibres | ||
| 1291 | Radiatio optica; fibrae geniculocalcarinae | Optic radiation; geniculocalcarine fibres | ||
| 1292 | Radiatio thalamica posterior | Posterior thalamic radiation | ||
| 1293 | Pars sublentiformis | Sublentiform limb; sublenticular limb | ||
| 1294 | Radiatio acustica; fibrae geniculotemporales | Acoustic radiation; geniculotemporal fibres | ||
| 1295 | Fibrae corticotectales | Corticotectal fibres | ||
| 1296 | Radiatio optica Gratiolet | Optic radiation Gratiolet | ||
| 1297 | Fibrae temporopontinae | Temporopontine fibres | ||
| 1298 | Fibrae corticothalamicae | Corticothalamic fibres | ||
| 1299 | Corona radiata | Corona radiata | ||
| 1300 | Capsula externa | External capsule | ||
| 1301 | Capsula extrema | Extreme capsule | ||
| 1302 | Commissura anterior | Anterior commissure | ||
| 1303 | Pars anterior | Anterior part | ||
| 1304 | Pars posterior | Posterior part |
Discussion