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White matter of the cerebrum
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Fibers of the
white matter
Association fibers Projection fibers Commissural fibers
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First: the association fibers2 types of association fibers are found :
Short fibers :connect adjacentgyri
Long associationfibers
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Long association fibers:1-Uncinate fasciculus:between orbital gyri and
anterior portion of
temporal lobe
2-The cingulum:
Between cingulate gyrus
and hippocampus.
3-The superior
longitudinalfasciculus :between
frontal , temporal andoccipital lobes.
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Long association fibers:
4-the inferior longitudinal
fasciculus: connects
between the occipital and
the temporal lobes.
5-fronto-occipital
fasciculus:between thefrontal and the occipital
lobes.
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Corpus callosum:
It is the greatest commissure.Rostrum: Connects between the orbital surfacesof the frontal lobes on both sides
Genu:Connects the anterior part of the frontal
lobes on both sides. The fibers of the genuradiate forwards towards the frontal polesforming the forceps minor.
Body: Connects between the posterior part ofthe frontal lobe and anterior part of the parietallobe on both sides. These fibers radiate laterallyforming the so called radiation of corpus
callosum.
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Splenium
Connects between the posteriorpart of the parietal lobe,temporal lobe and occipital lobe
on both sides. These fibers passeither:
Lateral to the posterior horn of the
lateral ventricle and are calledtapetum.
Medial to the posterior horn of thelateral ventricle and are called
forceps major.
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Commissural Fibers:1. Anterior commissure:It is present in theupper part of the lamina terminalis. It connects
between the following olfactory structures of both
sides:
a. Olfactory bulb.b. Anterior perforated substance.
c. Pyriform area.
d. Amygdaloid bodies.
2. Posterior commissure:It is present in the stalk
of the pineal body, just above the upper end of the
cerebral aqueduct.
.
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3. Habenular commissure:
It is present in the stalk of the pineal body, just
above the posterior commissure. Its fibers are
derived from the stria habenularis.
4. Hippocampal commissure (or commissure
of the fornix):
this commissure is in the form of transversefibers crossing from one crus of the fornix to
the other crus just behind the body of the
fornix. These fibers connect the hippocampus
with its fellow of the opposite side
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Internal Capsule
Projection fibers
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Definition:
The internal capsule is a V-shapedband ofwhite matter in the brain thatseparates the caudate nucleus andthe thalamus (medially) from thelenticular nucleus(laterally(
The internal capsule contains both
ascending and descending axons ofprojection fibers that connect thecerebral cortex with lower centers
http://en.wikipedia.org/wiki/White_matterhttp://en.wikipedia.org/wiki/Brainhttp://en.wikipedia.org/wiki/Caudate_nucleushttp://en.wikipedia.org/wiki/Thalamushttp://en.wikipedia.org/wiki/Lenticular_nucleushttp://en.wikipedia.org/wiki/Lenticular_nucleushttp://en.wikipedia.org/wiki/Thalamushttp://en.wikipedia.org/wiki/Caudate_nucleushttp://en.wikipedia.org/wiki/Brainhttp://en.wikipedia.org/wiki/White_matter8/3/2019 White Matter, Corpus Callosum
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caudate
thalamus
lentiform
anterior thalamic radiation:(limbic radiation)
genu
anteriorlimb
poster iorlimb
superior thalamic radiation:(somatosensor y and motorradiati ons)
sublenticular radiation:(auditory radiation)
retrolenticular radiation:(optic radiation)
lateralgeniculate
medialgeniculate
midline
thalamus
caudate
thalamus
lentiform genu
anteriorlimb
posteriorlimb
plane of sectionA
A
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Parts:
1-Anterior limb2-Genu
3-Posrerior limb(thalamo-lenticular
part)4-Retro-lentiform part
5-sub-lentiform part.
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Fibers:
part Descending fibers Ascending fibers
Ant. Limb Fronto-pontine fibers Ant. Thalamic radiation
Genu Cortico-bulbar fibers ___________________
Post. limb 1- cortico-spinal fibers
2- Fronto-pontine fibers
3- corico-rubral fibers
Sup. Thalamic radiation
Retrolentiform
Parieto-pontine&occipito-pontine fibers
Optic radiation+ posteriorthalamic radiation
Sub
lentiformTempro-pontine fibers Auditory radiation+inferior
thalamic radiation
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Blood supply:
Anterior limb:anterior cerebral artery
Genu: internal carotid artery
Posterior limb:middle cerebral artery,ant.Choroidal artery)
Retro&Sub-lenticular parts: anterior choroidalartery
http://en.wikipedia.org/wiki/Anterior_cerebral_arteryhttp://en.wikipedia.org/wiki/Middle_cerebral_arteryhttp://en.wikipedia.org/wiki/Anterior_choroidal_arteryhttp://en.wikipedia.org/wiki/Anterior_choroidal_arteryhttp://en.wikipedia.org/wiki/Anterior_choroidal_arteryhttp://en.wikipedia.org/wiki/Anterior_choroidal_arteryhttp://en.wikipedia.org/wiki/Middle_cerebral_arteryhttp://en.wikipedia.org/wiki/Middle_cerebral_arteryhttp://en.wikipedia.org/wiki/Anterior_cerebral_artery8/3/2019 White Matter, Corpus Callosum
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Thank you