(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.
Anatomy and supply. The pectoralis minor is a fan-shaped muscle of the shoulder girdle. It originates from the third to fifth ribs, and inserts on the coracoid process of the scapula. It is innervated by the medial and lateral pectoral nerves (C6-Th1), branches of the brachial plexus.natomy and supply. The pectoralis minor is a fan-shaped muscle of the shoulder girdle. It originates from the third to fifth ribs, and inserts on the coracoid process of the scapula. It is innervated by the medial and lateral pectoral nerves (C6-Th1), branches of the brachial plexus.