Fig. 4

a and b Atrophic subscapularis muscle - measuring of the vertical diameter without (a) and with (b) bony landmark; SSC: subscapularis muscle; white arrow: cranial atrophy of the SSC; VD: vertical diameter; CRTD: cranial transverse diameter; CATD: caudal transverse diameter; black arrow: ventral tip of the scapular “Y” as bony landmark to define the bony referenced VD. c and d: Atrophic subscapularis muscle - measuring of the cross sectional area of the upper half of the SSC muscle without (c) and with (d) bony landmark; SSC: subscapularis muscle with cranial atrophy; VD: vertical diameter; black arrow: ventral tip of the scapular “Y” as bony landmark to define the bony referenced VD; white arrow: CSA (cross sectional area) of the upper half of the muscle; CPVD: center point of the vertical diameter