The _Radiæus Externus_, or the _Longus_, having its Origine in the edge of the lower part of the Arm-Bone, slides from thence along the _Radius_ on the outside, extends it self under the _Annular_ Ligament, and cleaves to the Wrist-Bone, which stayeth the Fore-Finger. The _Brevis_ or _short_ Muscle of the Wrist springs from the lower part of the same Edge; afterwards it runs along the _Radius_, passeth under the _Annular_ Ligament, and is terminated in the Bone of the _Carpus_ or Wrist, which stayeth the Middle Finger. But we must take notice, that besides these six Muscles, there is also _Caro quædam quadrata_, or a square piece of Flesh under the _Palmaris_, which seems to arise from the _Thenar_, and sticks to the eighth Wrist-Bone. It is supposed that this Musculous piece of Flesh serves with the _Hypothenar_ of the little Finger, to make that which is call'd _Diogenes's Cup_. _How many Motions are there in the Fingers, and what are their Muscles_? {45} The Fingers are bent, extended, and turn'd from one side to the other by the means of twenty-three Muscles, whereof ten are proper, and thirteen common: The former are those that serve all the Fingers in general, and the other those that are particularly serviceable to some of them: The Common are the _Sublimis_, the _Profundus_, the common _Extensor_, the four _Lumbricales_, and the six _Interossei_. The _Sublimis_ or _Perforatus_, arising from the internal part of the lower Process of the _Humerus_ or Shoulder-Bone is divided into four _Tendons_, which run below the _Annular_ Ligament of the Wrist, and are inserted in the second _Phalanx_ of the Bones of the four Fingers, after having stuck in passing to those of the first _Phalanx_, to help to bend it. It is also observed that every one of these _Tendons_ hath a small cleft in its length, to let in the _Tendons_ of the _Profundus_. The _Profundus_ or _Perforans_ lies under the _Sublimis_, deriving its Original from the top of the _Cubitus_ and _Radius_. It creeps along these two Bones, and is divided into four _Tendons_, which pass under the _Annular_ Ligament, and slip into the Fissures of the _Tendons_ of the _Sublimis_, to adhere to the third _Phalanx_ of the Fingers, which they bend with the _Sublimis_: So that these two Muscles make together the bending of the Fingers. The _Extensor Magnus_ is that which extends the four Fingers. It springs from the external and lower Process of the Arm-Bone, and is divided into four flat _Tendons_, which pass under the _Annular_ Ligament, and cleave {46} to the second and third _Phalanx_ of the Fingers. The four _Lumbricales_ or _Vermiculares_ are in the Palm of the Hand, to draw the Fingers to the Thumb: They proceed from the _Tendons_ of the _Profundus_, and the _Annular_ Ligament, extend themselves along the sides of the Fingers and are inserted in their second Articulation, to cause the drawing toward the Thumb.