The _lesser Pectoral_, or _Serratus Minor Anticus_, is situated under the great _Pectoral_, its rise being by Digitation or Indenting in the second, third, and fourth of the upper Ribs, and its Insertion in the _Apophysis Coracoides_ of the Shoulder-Blade, which it draws forward. _How many Motions are there in the _Humerus_, or Arm; which be they, and what are its Muscles?_ {39} The Arm performs all sorts of Motions by the help of nine Muscles: For it is lifted up by the _Deltoides_ and the _Infra-Spinatus_; it is depress'd by the _Largissimus_, and the _Rotundus Major_; it is drawn forward by the _Pectoralis Major_, and the _Coracoideus_; it is drawn backward by the _Infra-Spinatus_, and the _Rotundus Minor_. It is drawn near the Ribs by the _Subscapularis_, and its circular Motion is performed when all these Muscles act together successively. The _Deltoides_ or _Triangular_ hath its beginning in the whole Spine of the _Omoplata_, the _Acromion_, and half the _Clavicula_, and by its point cleaves with a strong _Tendon_ to the middle of the Arm. The _Infra-Spinatus_ takes its rise in the Cavity that lies above the Spine of the _Omoplata_, which it fills, passing over the _Acromion_, until it is join'd to the Neck of the Shoulder-Bone, which it surrounds with a large _Tendon_. The _Largissimus_, otherwise call'd _Ani-scalptor_, covers almost the whole Back, proceeding from a large and Nervous Stock, in the third and fourth lower _Vertebra_ of the Back, the five _Vertebra's_ of the Loins, the Spine of the _Os Sacrum_, the hinder part of the Lip of the Hip-Bone, and the external part of the lower Bastard-Ribs, in passing from whence it insinuates it self into the lower Corner of the _Omoplata_, as also into the upper and inner part of the _Humerus_. The _Rotundus Major_, or _Teres Major_, having its Origin in the external Cavity of the lower Corner of the _Omoplata_, is confounded with the _Largissimus_, and adheres with it by the same {40} _Tendon_ to the upper and inner part of the _Humerus_, a little below the Head. The greater _Pectoral_ hath its Source in half the _Clavicula_, on the side of the _Sternum_; covers the fore-part of the Breast, and is fasten'd by a short, broad, and nervous _Tendon_, to the top of the Shoulder-Bone, on the inside, between the _Biceps_ and the _Deltoides_. The _Coracoideus_ or _Coracobrachyæus_, beginning in the _Apophysis Coracoides_ of the _Omoplata_ or Shoulder-Blade, adheres to the middle of the Arm on the inside, which with the _Pectoral_ it draws forward. The _Infra-Spinatus_ fills the Cavity which lies below the Spine of the _Omoplata_, its Origine being in the lower Rib of the _Omoplata_, from whence it passeth between the Spine and the _Rotundus Minor_, to cleave to the Neck of the Shoulder-Bone, which it embraceth, and draws backward.