作者在串制人体骨骼标本中发现了一例男性左侧第四肋骨的胸骨端为叉状肋骨,测量结果如下:上脚长40mm.其基底、中部和末端宽分别为13mm、9mm和8mm,厚分别为4mm、4 mm和5mm.下脚长44mm,其基底、中部、末端宽分别为14.5 mm、11.5mm和14.5 mm厚分别为3mm、3mm和5mm.下脚间距末端和中部为22mm和19mm. The authors found in the string of human skeletal specimens of a male left fourth rib of the sternum forked ribs, the measurement results are as follows: the foot length 40mm. The base, the middle and the end width of 13mm, 9mm and 8mm, respectively, thick 4 mm, and 5 mm, respectively, and the length of the lower leg is 44 mm. The basal, middle and distal widths are 14.5 mm, 11.5 mm, and 14.5 mm, respectively, and are 3 mm, 3 mm, and 5 mm, respectively.