middle clinoid process middle clinoid process the anterior boundary of the sella turcica is completed by two small eminences, one on either side, called the middle clinoid processes. it is found lateral to the sella turcica. middle clinoid processsphenoid bone. upper surface. (middle clinoid process labeled at upper left.)floor of the skull. (sphenoid is in yellow. middle clinoid process labeled at center left.)detailsidentifierslatinprocessus clinoideus mediusta98a02.1.05.008ta2591fma54700anatomical terms of bone etymology clinoid likely comes from the greek root klinein or the latin clinare, both meaning "sloped" as in "inclined."