The two Muscles on each side, which move the Head circularly, are the _Obliquus Major_ and {22} _Minor_; the _greater Oblique_ taking its rise from the second _Vertebra_ of the Neck, goes to meet the first; but the _lesser Oblique_ hath its Origine in the hinder part of the Head, and proceeds to join the other obliquely in the first _Vertebra_. _How many Muscles are there in the Lower-Jaw, and which be they?_ The Lower-Jaw hath twelve Muscles which cause it to move; that is to say, six on each side, whereof four serve to close and two to open it. The first of the Openers is the _Latus_, which beginning at the top of the _Sternum_, Clavicle, and _Acromion_, cleaves on the outside to the bottom of the Lower-Jaw-Bone. The second of the Openers is the _Digastricus_, which takes its rise in a Fissure lying between the Occipital Bone and the _Apophysis Mastoides_, from whence it passeth to the bottom of the Chin on the inside. The first of the Shutters is the _Crotaphites_ or Temporal Muscle, which hath its Origine at the bottom, and on the side of the _Os Coronale_, the _Os Parietale_, and the _Os Petrosum_, from whence it is extended till it cleaves to the _Apophysis Coronoides_ of the Lower-Jaw, after having passed above the _Apophysis_ of the _Zygoma_: Its Fibres are spread from the Circumference to the Center, and it is covered again with the _Pericranium_, which renders its Wounds very dangerous; so that the least Incisions as can be, ought to be made therein. The second is the _Pterygoideus_ or _Aliformis Externus_, whose rise is in the _Apophysis Pterygoides_, from whence it sets forward till it stick between the _Condylus_ and the Coronal of the Lower-Jaw. The third is the _Masseter_, which hath two {23} Sources or Beginnings, and as many Insertions; the first Source thereof is at the Cheek-Knot or Ball of the Cheek, and the second at the lower part of the _Zygoma_. The first Insertion is at the outer Corner of the Jaw, and the second in the middle part, by that means forming the Figure of the Letter X. The fourth is the _Pterygoideus_ or _Aliformis Internus_, which hath its beginning in the _Apophysis Pterygoides_, and is terminated in the inner Corner of the Jaw; so that Mastication or Chewing is perform'd by the means of these four Muscles. _How many Muscles are there in the Face, and which be they?_ There are two for the Forehead, call'd _Frontal_, whose Origine is in the upper part of the Head, from whence they descend by streight Fibres, until they are fasten'd in the Skin of the Forehead near the Eye-Brows, where they are re-united: Their Action or Office is to draw the Skin of the Forehead upward, whereto they stick very close. There are also two others call'd _Occipital_, which have their Beginning in the same place with the preceeding, but they descend backward, and cleave to the Skin of the hinder part of the Head, which they draw upward.