The innervation,muscle architecture and their clinical application in pectoralis major / 重庆医科大学学报

ABSTRACT

Objective:To provide anatomical basis for clinical application of human pectoralis major (P.major).Methods:The intramuscular nerve branches and muscle architectural features of P.major were dissected and observed.Results:1.The clavicular part(clavic.part) and sternal part of P.major had their anatomically distinct nerve supply.Some final terminal branches went along their course to each muscle slip.2.The average muscle mass,muscle length,fiber length and cross sectional area of the clavic.part of P.major were 45.9?10.8g,18.5?2.1cm,10.7?1.4cm and 4.1?1.1cm2,respectively and those of sternal part of P.major were 220.4?44.3g,21.4?1.6cm,17.2?2.6cm, 12.4?3.1cm2,respectively.Conclusion:1.P.major could be divided into clavic.part and sternal part compartments according to the intramuscular nerve branches.2.The force produced by sternal part is 3 times as much as the clavic.part and the excursion produced by the former is 1.6 times as much as the latter.The two compartrnents of P.major could be used for muscle transplant respectively,so could each muscle slip.