ANAT 321 Lecture Notes - Lecture 18: Out 1, Dopaminergic, Chorea
20 Dec 2017
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Motor cortex brainstem nuclei interneurons of sc cpg/motor neurons. M1 motor neurons of sc individual fingers movement to manipulate object. Finger movement = property of humans large area in m1 for hands & fingers. *fine motor control more important for humans evolutionarily. Ex: monkey cannot move fingers anymore because lost direct connection. Intrinsic circuitry of sc [interneurons] = forms cpg responsible for rhythmic movements. 2- terminate directly on ventral horn motor neurons = *organized at sc but controlled by higher processes at cortex. = modulated by basal ganglia [middle] & cerebellum [post] Ex: damage to 2 systems = serious movement deficits. Basal ganglia = principle component of a family of circuits linking thalamus & cerebral cortex. *all 4 nuclei interact w/ each other & motor cortex to influence movement. Lateral wall of lateral ventricles - loop from midline & thinner to posterior temporal lobe. *lateral to caudate nucleus & globus pallidus - triangular bean.
