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