The term applied to any groove or furrow, but especially to a ?ssure of the BRAIN.
n. (pl. sulci) 1. one of the many clefts or infoldings of the surface of the brain. The raised outfolding on each side of a sulcus is termed a gyrus. 2. any of the infoldings of soft tissue in the mouth, for example between the cheek and the alveolus.
a depression on both sides of the chest wall of a child between the pectoral muscles and the lower margin of the ribcage. It is caused by exaggerated suction of the diaphragm when breathing in and develops in conditions in which the airways are partially obstructed (e.g. poorly treated asthma) or when the lungs are abnormally congested due to some congenital abnormality of the heart. [E. Harrison (1789–1838), British physician]... harrison’s sulcus
Health Encyclopedia