The normal growth of the biceps brachii muscle in human fetuses.

摘要: Background The biceps brachii muscle, the strongest flexor and supinator at elbow joint, an accessory of glenohumeral joint is characterized by two heads, long short. Objectives purpose this study was to examine linear parameters (length width) in human fetuses provide their mathematical growth models. Material methods Using anatomical dissection, digital analysis (Multiscan v.14.02), statistics (Student's t-test regression analysis) authors bilaterally measured length (mm) width muscle 30 both sexes (14♂,16♀), aged 17-30 weeks. Results Neither sex nor laterality differences were found. All studied increased proportionally with age. Both mean (5.68 mm) widths, its mid-length (0.60 widest level (0.65 head's belly, found be statistically shorter (5.93 mm, 0.65 mm 0.72 respectively) when compared short belly. For these parameters, following models generated relation belly: y = -0.801 + 0.276 x Age (R2 0.591), -0.254 0.036 0.201) -0.238 0.038 0.226), -0.134 0.258 0.551), -0.227 0.241) -0.316 0.044 0.333). tendon turned out only significantly greater value for head (1.89 vs. 1.09 mm). 1.024 0.037 0.084) 0.177 0.039 0.157) heads computed. Conclusions are observed morphometric muscle. belly thinner than that longer head. developmental dynamics follow proportionately.