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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesSept 2911 The deep gray matter of the cerebrum consists of the basal ganglia the deepest layer of large collections of neuronal cell bodies The cerebral white matter contains many different fibres that connect all the parts of the brain together Association fibres connect different parts of the same hemisphere Short association fibres are connections within the same lobe or gyrus Long association fibres connect widely separated lobes and the info is sent from one lobe or gyrus to another Commissural fibres connect the left and right hemispheres The largest commissural fibre is the corpus callosum which lies superior to the lateral ventricles and deep within the longitudinal fissure Projection fibres either go from the cerebral cortex down to the spinal cord or from the spinal cord up to the cerebral cortex It is through these fibres that sensory information reaches the cerebral cortex and motor instructions leave it These fibres run vertically while the other two types run horizontally The internal capsule is a bundle of projection fibres that pass between the thalamus and the deep gray matter After the fibres go through this capsule they radiate out to all areas of the cerebral cortex and this is called the corona radiata The corona radiata is superior to the internal capsule The basal ganglia are involved in coordinating speed and strength of movements cognition learning and emotions CNS centres that participate in the command of skeletal muscle ideomotor area premotor cortex primary motor cortex basal ganglia cerebellum spinal reflexes The basal ganglia contain neuronal cell bodies which contain a nucleus inside This group of nuclei consist of the caudate nucleus the putamen and the globus pallidus The caudate nucleus is Cshaped and arches superiorly over the thalamus and lies medial to the internal capsule The lentiform nucleus consists of the putamen and globus pallidus and is inferior and post
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