infraspinous fossa infraspinous fossa the infraspinous fossa (infraspinatus fossa or infraspinatous fossa) of the scapula is much larger than the supraspinatous fossa; toward its vertebral margin a shallow concavity is seen at its upper part; its center presents a prominent convexity, while near the axillary border is a deep groove which runs from the upper toward the lower part. infraspinatous fossaleft scapula. dorsal surface. infraspinatous fossa shown in red.left scapula. dorsal surface. infraspinatous fossa labeled at center.detailsidentifierslatinfossa infraspinatata98a02.4.01.008ta21151fma23272anatomical terms of bone the medial two-thirds of the fossa give origin to the infraspinatus; the lateral third is covered by this muscle. additional images left scapula. infraspinatous fossa shown in red. animation. infraspinatous fossa shown in red. still image. left scapula. dorsal surface. ("infra-spinatous" fossa visible at bottom right.) left scapula. dorsal surface. infraspinatous fossa not labeled, but visible at center. infraspinatus muscle seen from behind. suprascapular and axillary nerves of right side, seen from behind.