Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Internal Capsule Bloos Supply and Neuroanatomy PowerPoint PPT presentation
HEMISPHERES
THE INTERNAL CORE OF THE CEREBRAL HEMISPHERES
COMPOSED OF MYELINATED NERVE FIBRES
? ASSOCIATION FIBRES
? COMMISSURAL FIBRES
? PROJECTION FIBRES
ACONNSSOCECTS DIFFERENIT PAARTIONTS OF CEREBRAFL CORITEXBRE OF THE SAMSE
HEMISPHERE TO EACH OTHER
? SHORT ASSOCIATION FIBRES
? LONG ASSOCIATION FIBRES
COMMISURALFIBRES
CROSS THE MIDLINE AND CONNECT THE IDENTICAL PARTS
OF THE TWO HEMISPHERES
PROJCONNECT THEE CERCEBRTAIL CORONTEXF TO OTHER RIEGIBREONS OF CENSTRAL
NERVOUS SYSTEM BELOW IT BY ASCENDING (CORTICOPETAL) AND
DESCENDING(CORTICOFUGAL) FIBRES
IN?CToEmRNpactAL bunCdAPle oSUf proLjecEtion fibres
? Situated in the inferomedial part of each
cerebral hemispheres.
? Projects from the cerebral cortex to
interconnect with subcortical centres in
the brainstem and spinal cord and with the
thalamus.
RE?FLanATs ouIOt roNstSrally to form CORONA
RADIATA
? Condense caudally as CRUS CEREBRI of
Midbrain.
? Medially Thalamus and Caudate nucleus
? Laterally Lentiform nucleus
P?ARTANTESRIOORF LIINMBTERNAL
C?APPSUOSTERLIEOR LIMB
? GENU
? RETROLENTIFORM PART
? SUBLENTIFORM PART
AN?TLiesE beRIOtweenR thLe cIMBaudate nucleus medially and
the anterior part of lentiform nucleus laterally
? Fibres to and from the anterior part of frontal
lobe passes through the anterior limb
P?OSTPosterEiRIOor limb RliesL bIMBetweenAN the tDhGEalamuNs
medially and the posterior part of the lentif U
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
frontal lobe and a greater part of the parietal
lobe passes through genu and posterior limb.
RE?BTehROind tLheE pNostTerIFiorO enRMd of thPeART lentiform
nucleus
? Fibres to and from the occipital lobe and the rest
of the parietal lobe passes through the
retrolentiform part
SU?PBassLeEs bNeTlowIF thOe leRMntiforPmART nucleus
? Fibres to and from the temporal lobe passes
through sublentiform part
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
radiation.
? DESCENDING FIBRES(MOTOR FIBRES)- Also
called the centrifugal fibres
ASC?ANENTERDIINOR GTHFAIBLAREMIC SRADIATION
anterior and dorsomedial nuclei of thalamus
anterior limb frontal thalamic peduncle
frontal cortex
?SUPERIOR THALAMIC RADIATION
ventroposterolateral nuclei of thalamus
genu and posterior limb of capsule
superior/dorsal thalamic peduncle
somatosensory area.
? These fibres are the third order sensory neurons
responsible for conveying somesthetic
sensations to cerebral cortex.
? POSTERIOR THALAMIC RADIATION
lateral geniculate body retrolentiform part
posterior/caudal thalamic peduncle
occipital lobe
? This includes the OPTIC RADIATION to the visual
cortex
? INFERIOR THALAMIC RADIATION
medial geniculate body sublentiform part
ventral thalamic peduncle temporal lobe
? This include the AUDITORY RADIATION to the
acoustic area of cerebral cortex.
D?ECSCORETICNDOPINONTIGNEFIB FIBRERESS
? PYRAMIDAL FIBRES
? EXTRAPYRAMIDAL FIBRES
? CORTICOTHALAMIC FIBRES
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
opposite cerebel ar hemisphere ? CORTIOCO
PONTO CEREBALLAR pathway.
? FRONTOPONTINE FIBRES- Passes through
anterior limb genu and the posterior limb.
? PARIETOPONTINE FIBRES-Passes mainly through
the retrolentiform part and some through
sublentiform part
? TEMPOROPONTINE FIBRES-Passes through the
sublentiform part.
? OCCIPITOPONTINE PART-Passes through the
retrolentiform part.
P?YCRAMID
ORTICO AL
NUCLEF
A IB
R FI RE
BRE SS-
Synapse with contralateral motor nuclei of the
cranial nerve which innervate the muscles of the
head and neck muscles.
Occupies the genu of the internal capsule
? 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
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
E?XTCORRAPTICOSTYRIRAMID
ATE FIBRES- AL
Termi F
natIB
es i RE
n the S
CORPUS
STRIATUM-
? CORTICORUBRAL FIBRES- Terminates in the RED
NUCLEUS-POSTERIOR LIMB
? CORTICORETICULAR FIBRES- Terminates in the
RETICULAR NUCLIE-POSTERIOR LIMB AND GENU
? CORTICOTECTAL FIBRES- Terminates in the TECTAL
NUCLIE-RETROLENTIFORM PART
CTOheRTse pICasseOs fTrHomAL varAMICious partsF of tIBheRE cereSbral
cortex to the thalamus and forms a part of the
Thalamic radiation.
? FRONTOTHALAMIC FIBRES-ANTERIOR LIMB
? PARIETOTHALAMIC FIBRES-GENU AND
POSTERIOR LIMB
? TEMPOROTHALAMIC FIBRES-SUBLENTIFORM
PART
? OCCIPITOTHALAMIC FIBRES-RETROLENTIFORM
PART
ART?MEDIEAL RIALAND LATERSUAL STPRIATE LBRYANOCH FOF TMIHDDELE C
INTERNALCAPSULE EREBRAL
ATERY
? RECURRENT BRANCH OF THE ANTERIAL CEREBRAL ARTERY
? ANTERIAL CHOROIDAL ARTERY
? DIRECT BRANCHES FROM INTERNAL CAROTID ARTERY
? BRANCHES FROM POSTERIOR COMMUNICATING ARTERY
? STRIATE BRANCHES OF POSTERIAL CEREBRAL ATRERY
? 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
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
communicating artery
o Posterior limb-anterior choroidal artery and striate branch of
posterior cerebral arery
? Retrolentiform part- anterior choroidal artery
? Sublentiform part-anterior choroidal artery
THANKYOU
This post was last modified on 12 August 2021