HMB320H1 Lecture Notes - Lecture 4: Ventral Posterior Nucleus, Limbic System, Superior Colliculus
Document Summary
The medullar center is composed of two components. Gray matter: groups of neuronal cell bodies (which can be organized into nuclei or ganglia) White matter: axons comprising fiber tracts (which all have a name) The thalamus surrounds the walls of the 3rd ventricle (diencephalon) The pink structure is the basal ganglia (cell bodies) Within the lips of the lateral fissure is the insula (insular cortex) Insular cortex can be seen in coronal view (white matter stains dark) Association fibres: connect different structures within the same hemisphere. Commissural fibres: connect the left and right hemispheres. Projection fibers: connect cortex with lower centers (diencephalon, midbrain, pons, medulla, cerebellum, spinal cord) Fibres are efferent and afferent to the cortex. This means that afferent fibers to the cortex receive information, while the efferent fibres project out to the motor neurons. Short association fibers: u" fires connecting adjacent gyri or lobes (connecting the premotor gyrus to the sensory gyrus)
