tibia midshaft endosteal cross-sectional area 2013-07-29T10:55:15Z CMO:0001716 JSmith MA:0001361 The portion of the cross-sectional area of the tibia, measured midway between the two ends of the bone, that corresponds to the area circumscribed by the endosteum, the tissue lining the medullary or marrow cavity in the shaft of a long bone, i.e. the cross-sectional area of the medullary cavity of the tibia at midshaft. The cross-sectional area of the tibia is the extent of a plane through, that is, perpendicular to the longest axis of the tibia, the medial and larger of the two bones of the lower leg of bipeds or hindlimb of quadrupeds which articulates with the femur, fibula, and talus. VT:0000558 clinical_measurement_ontology tibia cortical bone midshaft endosteal cross-sectional area tibial midshaft cortical endosteal area tibia midshaft cross-sectional area