This is a compact bundle of fibres through which the large collections of fibres pass White Matter of Cerebral hemisphereAssociation tracts (fibers)- different regions in cerebral cortexProjection tracts (fibers)- cerebral cortex other masses of gray matterCommissures fibers- R L HIGHLIGHTS…INTRODUCTIONPARTS OF INTERNAL CAPSULEBLOOD SUPPLY Some categorizations are approximations, and some Brodmann areas span gyri.INTERNAL CAPSULEAMUTHAMEENA MANOHARANTHIAGGU PALANJAYAGANTHAN MANAUGARMOHD ZAHIR Insular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert Striatum ( Putamen, Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra Subgenual area ( 25), anterior cingulate ( 24, 32, 33), Posterior cingulate ( 23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrusĬorpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria Superior and Inferior longitudinal fasciculus, uncinate fasciculus, cingulum, Inferior occipitofrontal fasciculus Primary auditory cortex ( 41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe ( Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36) Primary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus Somatosensory cortex ( Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules ( Arcuate fasciculus/Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus Precentral gyrus ( Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/ Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44- Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex ( 10, 11, 12, 47) Medial longitudinal, Lateral, Central, Parietoöccipital, Calcarine, Cingulate, Callosal Collateral fissure e Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres).Hearing should not be affected in a single capsule lesion, as this information crosses over to both sides of the brain while in the brainstem. They can affect sensory and motor systems on the opposite side of the body, and possibly eyesight (to the contralateral visual field). Infarctions to the internal capsule tend to be small, punctate lesions. Striate arteries, which come off the middle cerebral artery, enter through the anterior perforated substance in the base of the brain. Some fibers from the medial geniculate nucleus (which carry auditory information) also pass in the retrolenticular internal capsule, but most are in the sublenticular part.īlood supply is similar to the other structures of the region. More posteriorly, this becomes the optic radiation. The retrolenticular part contains fibers from the optic system, coming from the lateral geniculate nucleus of the thalamus.2) thalamocortico fibers connect the medial and anterior nuclei of the thalamus to the frontal lobes (these are severed during a prefrontal lobotomy).1) frontopontine (corticofugal) fibers project from frontal cortex to pons.The anterior limb of the internal capsule contains:.The genu contains corticobulbar fibers, which run between the cortex and the brainstem.The posterior limb of the internal capsule contains corticospinal fibers and sensory fibers from the body.There is also a retrolenticular and a sublenticular part to the internal capsule. the part behind the genu is called the "posterior limb" or crus posterius.the part in front of the genu is the "anterior limb".the bend in the V is called the "genu".
The internal capsule is V-shaped when cut both coronally (on the same plane as the face) and horizontally/ transversely (the same plane as the brim of a top hat).
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