ANAT 1010 Lecture Notes - Lecture 5: Lateral Corticospinal Tract, Cerebral Peduncle, Cerebral Cortex
3 Aug 2018
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Document Summary
Somatic motor pathways: control body movement (skeletal muscle, 2 main pathways are, direct or pyramidal pathway-primary motor cortex, motor cortex to motor neurons which projects to skeletal muscle. Indirect or extrapyramidal pathway: multi-synaptic pathway, basal ganglia help establish muscle tone and integrate semi-voluntary autonomic movements, cerebellum helps make movements smooth and helps maintain posture and balance, voluntary: need to think about. Involuntary: don"t need to think about, done by the indirect pathway. In the diencephalon, just outside the thalamus, descending axons gather together to form the internal capsule. In the midbrain, the axons form the cerebral peduncles. In the pons they are called the corticospinal or corticobulbar tracts. In the medulla oblongata they form the pyramidal tracts. Location of direct pathways: lateral corticospinal tract, anterior corticospinal tract. Motor area of cerebral cortex: voluntary motor initiation, primary motor area = precentral gyrus, controls voluntary contractions of skeletal muscles on other side.
