1 Extrapyramidal tracts â These tracts originate in the brain stem, carrying motor fibres to the spinal cord. 2  They are responsible for the involuntary and automatic control of all musculature, such as muscle tone, balance, posture and locomotion.his 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.
The word oxygen comes from Greek words: oxus (acid) and gennan (generate). Oxygen comes to earth from all parts of the universe in meteorites. It is also found in minerals and plants that grow on the earth and other planets.
Oxygen was named in 1777 by Antoine Lavoisier. He first used the term oxygene oxygÃ©ne to refer to a newly discovered element that could be used to make. Acids the word came â¦ fro m The greek root-, oxy meaning sharp or, pungent-and, gen meaning that which.. Creates so oxygen means a substance that creates. acidsherefore the literal meaning of the word is 'that which makes acid', and this was because when oxygen was first isolated in air, its role or importance was not known and it was treated as any other new element.