(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.
Most Emailed Articles. &quot;Big Five&quot; Personality Quiz. Anatomy of the Brain Central Sulcus (Fissure of Rolando) Function: The central sulcus is the large deep groove or indentation that separates the parietal and frontal lobes.mage: Major Sulci:Central Sulcus Lateral Surface of the Brain For additional information see: HOPES Brain Tutorial Back to Anatomy of the Brain. Function: 1  The central sulcus is the large deep groove or indentation that separates the parietal and frontal lobes.