The name Alana is a Celtic baby name. In Celtic the meaning of the name Alana is: meaning harmony, stone, or noble. American Meaning: The name Alana is an American baby name. In American the meaning of the name Alana is: meaning harmony, stone, or noble.aelic Meaning: The name Alana is a Gaelic baby name. In Gaelic the meaning of the name Alana is: This name of uncertain origin may be a feminine form of Man, or derived from the Irish Gaelic word for 'child'.
Substantia nigra is Latin for black substance, reflecting the fact that parts of the substantia nigra appear darker than neighboring areas due to high levels of neuromelanin in dopaminergic neurons.It was discovered in 1784 by Felix FÃ©lix-vicq'D, azyr And Samuel thomas Von soemmerring sÃ¶mmerring alluded to this structure. in 1791he most prominent function of the pars compacta is motor control, though the substantia nigra's role in motor control is indirect; electrical stimulation of the substantia nigra does not result in movement, due to mediation of the striatum in the nigral influence of movement.
This article is about the descending tracts of the central nervous system. The descending tracts are the pathways by which motor signals are sent from the brain to lower motor neurones. The lower motor neurones then directly innervate muscles to produce movement. Pyramidal tracts â These tracts originate in the cerebral cortex, carrying motor fibres to the spinal cord and brain stem. They are responsible for the voluntary control of the musculature of the body and face. Extrapyramidal tracts â These tracts originate in the brain stem, carrying motor fibres to the spinal cord.