The Transversalis springs forth out of the upper Vertebra's of the Back, and cleaves to the Extremity of the four Vertebra's of the Neck.
C H A P. VIII.
Of the Myology or Anatomy of the Muscles of the Chest; or of the Breast Belly, and Back.
How many Muscles are there in the Breast, and which be they?
The Breast hath fifty seven Muscles, that is to say, thirty that serve to dilate it, twenty six whose Office is to contract it, and the Diaphragm or Midriff, which partakes of both Actions.
The thirty which dilate the Breast are equally plac'd to the number of Fifteen, viz. the Subclavius, the Serratus Major Anticus, the two Serrati Postici, and the eleven external Intercostals.
The twenty six which contract the Breast are likewise equally rank'd to the Number of thirteen on each side, viz. the Triangularis, the Sacrolumbus, and eleven internal Intercostals.
The Subclavian takes up the whole space between the Clavicle and the first Rib: Its Original being in the internal and lower part of the Clavicula, and its insertion in the upper part of the first Rib.