(Botany) an association of a fungus and a plant in which the fungus lives within or on the outside of the plant's roots forming a symbiotic or parasitic relationship. See ectotrophic mycorrhiza, endotrophic mycorrhiza. [C19: from myco- + Greek rhiza root]
Medical Definition of POSTERIOR MEDIAN SULCUS. : a shallow groove along the midline of the posterior part of the spinal cord that separates the two posterior funiculi and is the external boundary of the posterior median septum. a shallow groove along the midline of the posterior part of the spinal cord that separates the two posterior funiculi and is the external boundary of the posterior median septum.
Central sulcus Function. Its primary function is to separate the parietal lobe of the cerebral cortex from the frontal lobe. The parietal lobe, also referred to as the Parietal cortex, is the section of the cerebral cortex in either brain hemisphere that is situated under the crown of the head.entral sulcus Definition. It is a furrow or deep groove in the brain. It is said to have a âmapâ of the body on each side that matches the other side.