Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance

Table 3

Morphometric characteristics of the pectoralis major muscle (PM).

The width of the origin of the sternocostal part of PM [mm]
	Minimal value	Maximal value	Mean	Median	Standard deviation
Male cadavers	160	215	182	185	17
Female cadavers	133	181	156	154	19
Total	133	215	172	177	22
The width of the PM in the midclavicular line (measured to the level of inferior border of the muscle) [mm]
	Minimal value	Maximal value	Mean	Median	Standard deviation
Male cadavers	172	224	196	194	16
Female cadavers	173	223	194	191	16
Total	172	224	196	194	15
Asymmetry of the width of the PM in the midclavicular line [%]
	Minimal value	Maximal value	Mean	Median	Standard deviation
Male cadavers	1.6	17.9	7.3	3.4	6.2
Female cadavers	1.4	12.1	6.4	6.3	4
Total	1.4	17.9	6.9	5.2	5.2
The width of the insertion of PM [mm]
	Minimal value	Maximal value	Mean	Median	Standard deviation
Male cadavers	53.8	83.2	66.7	66	9.7
Female cadavers	43.9	78.3	62.9	60.3	10.2
Total	43.9	83.2	65.3	63.6	9.8
The distance between the top of the greater tubercle and upper border of PM tendon [mm]
	Minimal value	Maximal value	Mean	Median	Standard deviation
Male cadavers	38.3	65.2	53.9	54.2	8.2
Female cadavers	41.5	58.5	48.1	47.9	5.8
Total	38.3	65.2	52.1	51.8	7.9