INTERNAL CAPSULE
- INTERNAL CAPSULE
- Compact bundle of projection fibres ( प्रक्षेप तन्तु का पुंज )
- between thalamus and ( चेतक )
- caudate nucleus medially
- lentiform nucleus laterally
- these fibers
- fan out rostrally ( चोंच की ओर )
- 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 ( व के अकार का )
- concavity directed laterally
- parts
- Anterior limb ( अग्र अङ्ग् )
- lies between
- head of caudate nucleus medially
- anterior part of lentiform nucleus
- posterior limb ( पश्च अङ्ग् )
- lies between thalamus medially and posterior part of lentiform nucleus (चंद्र ज्ञाणंड )
- genu ( जानु
- bend between anterior and posterior limb
- retro-lentiform part ( पश्च चंद्र ज्ञाणंड भाग )
- lies behind lentiform nucleus
- sublentiform part ( अधः चंद्र ज्ञाणंड भाग )
- lies below lentiform nucleus
- Constituent fibers
- Motor fibers ( corticofugal fibres - अवप्रमस्तिष्क तन्तु )
- corticopontine fibres ( प्रमस्तिष्क-सेतु तन्तु )
- largest single group of projection fibers
- naming ( named according to lobe from which they arise )
- frontopontine ( ललाट सेतु )
- numerous
- pass through anterior limb , genu and posterior limb
- parietopontine ( पार्श्व सेतु )
- pass through retrolentiform part
- occipitopontine ( पश्च सेतु )
- pass through retrolentiform part
- temporopontine ( शंख सेतु )
- pass through sublentiform part
- relay in ipsilateral pontine nuclei ( सेतु ज्ञान्ड में जाता है )
- from ipsilateral pons to contralateral cerebellum ( वहाँ से अनुमस्तिष्क )
- pyramidal fibers
- corticonuclear ( प्रमस्तिष्क )
- corticospinal ( प्रमस्तिष्क-मेरु )
- extrapyramidal fibers
- corticorubral
- corticostriate
- corticonigral
- corticopetal fibres ( sensory fibers - अभिप्रमस्तिष्क तन्तु )
- thalamocortical fibres ( thalamic radiation -चेटक तंत्रिका )
- according to direction
- anterior thalamic radiation ( अग्र )
- connects
- anterior and dorsomedial nuclei of thalamus to frontal lobe
- passes through
- anterior limb
- superior thalamic radiation ( ऊर्ध्व )
- connects
- ventral tier of thalamic nuclei with sensory cortex of frontal and parietal lobes
- through
- anterior limb of internal capsule
- posterior thalamic radiation ( पश्च )
- pass through
- retrolentiform part ( पश्च चंद्र भाग )
- connects
- lateral geniculate body to primary visual cortex forming optic radiation
- inferior thalamic radiation ( अधः )
- pass through
- sublentiform part ( अधः चंद्र भाग )
- connects
- medial geniculate body with the primary auditory area of temporal lobe
- auditory radiation
Discussion