Anatomi Fiber. for dtudent doctoer and nursepptx

anantomi

1. Fibers Anatomy Dr. dr. Rohadi Sp.BS ( K )

2. Association Fibers Association fibers  are  axons   that connect   cortical areas   within the same   cerebral hemisphere . In human neuroanatomy ,  axons  ( nerve fibers ) within the brain , can be categorized on the basis of their course and connections as association fibers ,  projection fibers , and   commissural fibers . The association fibers unite different parts of the same   cerebral hemisphere , and are of two kinds : (1) short association fibers that connect adjacent gyri ; (2) long association fibers that make connections between more distant parts .

3. Association Fibers These are the fibers connecting different cortical areas of the same side to one another . Short association fibers connect adjacent   gyri . Long association fibers connect distant part of the cerebral cortex in the same side . 1. Uncinate fasciculus : temporal pole to motor speech area and orbital cortex 2. Cingulum   fasciculus : cingulum   gyrus   to   parahippocampal gyrus 3. Superior longitudinal fasciculus : frontal to occipital and temporal lobes 4. Inferior longitudinal fasciculus : temporal to   occipital lobe

4. Short association fibers Many of the short association fibers ( also called arcuate or " U "- fibers ) lie immediately beneath the gray substance of the cortex of the hemispheres , and connect together adjacent   gyri . Some pass from one wall of the sulcus to the other .

5. The long association fibers connect the more widely separated gyri and are grouped into bundles.They include the following : Name From To uncinate fasciculus frontal lobe temporal lobe cingulum cingulate gyrus entorhinal cortex superior longitudinal fasciculus frontal lobe occipital lobe inferior longitudinal fasciculus occipital lobe temporal lobe vertical occipital fasciculus inferior parietal lobule fusiform gyrus occipitofrontal fasciculus occipital lobe frontal lobe Arcuate fasciculus frontal lobe temporal lobe Long association fibers

6. Projection fibers . Projection fibers : These are the fibers which connect the cerebral cortex to other parts of the CNS such as brain stem and spinal cord in both directions , e.g., corticospinal and   corticopontine fibers .

7. Commisural Fibers Commissural fibers : These fibers connect corresponding areas of the two hemispheres . The commissural fibers include the following : 1. Corpus callosum 2. Anterior commissure 3. Posterior commissure 4. Hippocampal commissure 5. Habenular commissure 6. Hypothalamic commissure 7. Cerebellar commissure

8. Corpus Callosum