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.
Transcript of Name of the element, including an explanation for the origin. Oxygen-From the Greek words oxus (acid) and gennan (generate). Name of the element, including an explanation for the origin of its name if that origin is known.OXGEN.6. Oxygen is in group 16, period 2 and in the series of nonmetals. Selenium, sulfur, tellurium, & polonium all have similar properties.ame of the element, including an explanation for the origin of its name if that origin is known. OXGEN. 6. Oxygen is in group 16, period 2 and in the series of nonmetals.