(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.
The central sulcus is a deep groove (or furrow) in the brain that separates the frontal and parietal lobes of the cerebrum.he lateral sulcus separates the temporal lobe from the parietal and frontal lobes. Edit. Share to: 1  Anatomy of the Temporal Lobe: The Four Surfaces and Their Functions If you are studying temporal lobe anatomy then you know that it is one of four major lobes of the cerebral cortex portion of the brain.