Download MBBS Internal Capsule Bloos Supply and Neuroanatomy Lecture PPT

WHITEMATTEROFCEREBRAL
HEMISPHERES
THE INTERNAL CORE OF THE CEREBRAL HEMISPHERES
COMPOSED OF MYELINATED NERVE FIBRES
? ASSOCIATION FIBRES

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? COMMISSURAL FIBRES
? PROJECTION FIBRES

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ACONNSSOCECTS DIFFERENIT PAARTIONTS OF CEREBRAFL CORITEXBRE OF THE SAMSE
HEMISPHERE TO EACH OTHER
? SHORT ASSOCIATION FIBRES

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? LONG ASSOCIATION FIBRES

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COMMISURALFIBRES
CROSS THE MIDLINE AND CONNECT THE IDENTICAL PARTS
OF THE TWO HEMISPHERES

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PROJCONNECT THEE CERCEBRTAIL CORONTEXF TO OTHER RIEGIBREONS OF CENSTRAL

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NERVOUS SYSTEM BELOW IT BY ASCENDING (CORTICOPETAL) AND
DESCENDING(CORTICOFUGAL) FIBRES

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IN?CToEmRNpactAL bunCdAPle oSUf proLjecEtion fibres
? Situated in the inferomedial part of each

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cerebral hemispheres.
? Projects from the cerebral cortex to
interconnect with subcortical centres in
the brainstem and spinal cord and with the
thalamus.

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RE?FLanATs ouIOt roNstSrally to form CORONA
RADIATA
? Condense caudally as CRUS CEREBRI of
Midbrain.
? Medially Thalamus and Caudate nucleus

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? Laterally Lentiform nucleus

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P?ARTANTESRIOORF LIINMBTERNAL

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C?APPSUOSTERLIEOR LIMB
? GENU
? RETROLENTIFORM PART
? SUBLENTIFORM PART

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AN?TLiesE beRIOtweenR thLe cIMBaudate nucleus medially and

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the anterior part of lentiform nucleus laterally
? Fibres to and from the anterior part of frontal
lobe passes through the anterior limb

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P?OSTPosterEiRIOor limb RliesL bIMBetweenAN the tDhGEalamuNs
medially and the posterior part of the lentif U

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orm
nucleus laterally
? Genu is the bend between the anterior and the
posterior limb with concavity to the lateral side
? Fibres to and from the posterior part of the

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frontal lobe and a greater part of the parietal
lobe passes through genu and posterior limb.

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RE?BTehROind tLheE pNostTerIFiorO enRMd of thPeART lentiform
nucleus
? Fibres to and from the occipital lobe and the rest

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of the parietal lobe passes through the
retrolentiform part

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SU?PBassLeEs bNeTlowIF thOe leRMntiforPmART nucleus
? Fibres to and from the temporal lobe passes
through sublentiform part

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C?OANSCSTENITDINUGE FINBRTES(FIBSENRESORSY FIOBFRE
INTERNALCAPSULE S)-
These are predominantly thalamocortical fibres
which go from the thalamus to all parts of the
cerebral cortex(constitutes most of the Thalamic

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radiation.
? DESCENDING FIBRES(MOTOR FIBRES)- Also
called the centrifugal fibres

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ASC?ANENTERDIINOR GTHFAIBLAREMIC SRADIATION
anterior and dorsomedial nuclei of thalamus

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anterior limb frontal thalamic peduncle
frontal cortex

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?SUPERIOR THALAMIC RADIATION
ventroposterolateral nuclei of thalamus
genu and posterior limb of capsule

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superior/dorsal thalamic peduncle
somatosensory area.
? These fibres are the third order sensory neurons
responsible for conveying somesthetic
sensations to cerebral cortex.

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? POSTERIOR THALAMIC RADIATION
lateral geniculate body retrolentiform part
posterior/caudal thalamic peduncle
occipital lobe
? This includes the OPTIC RADIATION to the visual

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cortex

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? INFERIOR THALAMIC RADIATION
medial geniculate body sublentiform part
ventral thalamic peduncle temporal lobe
? This include the AUDITORY RADIATION to the

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acoustic area of cerebral cortex.

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D?ECSCORETICNDOPINONTIGNEFIB FIBRERESS
? PYRAMIDAL FIBRES
? EXTRAPYRAMIDAL FIBRES
? CORTICOTHALAMIC FIBRES

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C?O ORTrigiICnatOes PfrOomN alT oINf tEhe lFoIBbes REof tShe
cerebral hemispheres and .
? About 2/3rd of the total fibre component.
? They relay in the ipsilateral pontine nuclie
cross the midline to relay in the cortex of the

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opposite cerebel ar hemisphere ? CORTIOCO
PONTO CEREBALLAR pathway.

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? FRONTOPONTINE FIBRES- Passes through
anterior limb genu and the posterior limb.
? PARIETOPONTINE FIBRES-Passes mainly through

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the retrolentiform part and some through
sublentiform part
? TEMPOROPONTINE FIBRES-Passes through the
sublentiform part.
? OCCIPITOPONTINE PART-Passes through the

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retrolentiform part.

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P?YCRAMID
ORTICO AL
NUCLEF
A IB

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R FI RE
BRE SS-
Synapse with contralateral motor nuclei of the
cranial nerve which innervate the muscles of the
head and neck muscles.

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Occupies the genu of the internal capsule

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? CORTICOSPINAL FIBRES-
Synapse with the anterior horn cells of the
opposite half of the spinal cord which innervate
the muscles of the upper limb , trunk and lower

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limb
Forms several discrete bundle in the anterior 2/3rd
of the posterior limb
Fibres of upper limb are most anterior followed by
trunk and lower limb

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E?XTCORRAPTICOSTYRIRAMID
ATE FIBRES- AL
Termi F
natIB
es i RE

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n the S
CORPUS
STRIATUM-
? CORTICORUBRAL FIBRES- Terminates in the RED
NUCLEUS-POSTERIOR LIMB

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? CORTICORETICULAR FIBRES- Terminates in the
RETICULAR NUCLIE-POSTERIOR LIMB AND GENU
? CORTICOTECTAL FIBRES- Terminates in the TECTAL
NUCLIE-RETROLENTIFORM PART

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CTOheRTse pICasseOs fTrHomAL varAMICious partsF of tIBheRE cereSbral

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cortex to the thalamus and forms a part of the
Thalamic radiation.
? FRONTOTHALAMIC FIBRES-ANTERIOR LIMB
? PARIETOTHALAMIC FIBRES-GENU AND
POSTERIOR LIMB

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? TEMPOROTHALAMIC FIBRES-SUBLENTIFORM
PART
? OCCIPITOTHALAMIC FIBRES-RETROLENTIFORM
PART

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ART?MEDIEAL RIALAND LATERSUAL STPRIATE LBRYANOCH FOF TMIHDDELE C

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INTERNALCAPSULE EREBRAL
ATERY
? RECURRENT BRANCH OF THE ANTERIAL CEREBRAL ARTERY
? ANTERIAL CHOROIDAL ARTERY
? DIRECT BRANCHES FROM INTERNAL CAROTID ARTERY

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? BRANCHES FROM POSTERIOR COMMUNICATING ARTERY
? STRIATE BRANCHES OF POSTERIAL CEREBRAL ATRERY

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? The upper parts of the anterior limb genu and posterior limb-
lateral and medial striate branches of middle cerebral artery.
CHARCOT ARTERY- larger lateral striate branch

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more frequently ruptured
supplies posterior limb
? The lower parts are supplied as follows
o Anterior limb- recurrent artery of Heubner
o Genu-direct branch from internal carotid and posterior

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communicating artery
o Posterior limb-anterior choroidal artery and striate branch of
posterior cerebral arery

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? Retrolentiform part- anterior choroidal artery
? Sublentiform part-anterior choroidal artery

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THANKYOU

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