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XL. If the Muscles dedicated to any Function of the Arm, are wounded, those Functions will be hurt. That which lies upon the Epomis being wounded, the Mo∣tion drawing the Arm upright is hurt. If those two which come by the sides of the former, from the Scapula, be wounded, the Motion which draws the Arm backward or forward, according as they are on this or that side, is hurt. If the three Muscles
which draw the Arm to the Brest are wounded, that Motion also is frustrate. If the four Muscles, proceeding from the Scapula, and that from the lower end of the lowest Rib, under the Scapula, be wounded, the Mo∣tion which turns the Arm back∣ward is prejudiced.
XLI. If the Muscles dedicated to the Cubit, or Elbow, are wound∣ed, the Functions of the Cubit will also be hurt. If the Muscle which appears near the Humeral Vein, having two Heads, one upon the edge of the Head of the Sca∣pula, and another upon the Pro∣cess, and cleaving first to the Os Brachii, and then to the Ra∣dius, having a second under it, assistent to the same Action, be wounded, the Motion extending the Cubit will be hurt: But if a Wound be made in the hinder Part, opposite to the aforesaid Muscles, touching their ends, the Office of bending the Elbow will be lost. If the long Muscle arising from the Os Humeri, and implanted into the lower Ap∣pendix of the Radius, being the second of them which draw the Radius forwards, be wounded, the Motion raising the Radius supinely will be hindred. But if the lower Part of the Ʋlna, going along to the lower Part of the Wrist, be wounded, all the Motions of the Wrist will be hurt; for there all the four Muscles of the Cubit, which are the cause of all the Motion of the Arm, are extended.
XLII. If a Wound be made in the inside of the Cubit, inclining a little back, then the second Joints of the four Fingers cannot bend; for there runs one Muscle, the first among the Internal, which moves the upper part of the Hand, which arising from the lower Swelling of the Humerus, is hid under others, till it comes to the Elbow, where coming forth, it is seen under the Skin, except what the former Muscle does pass over: This then ha∣ving passed the Wrist, is divi∣ded into four Tendons, each of which being fixt to the second Bones of the Fingers, are their Benders. And therefore, what∣ever of the internal Muscles, which run down with the first to the Wrist, are cut, certainly hurt the Function of Contracti∣on, or bending.
XLIII. The Hand is manifestly extended by the external Muscles, placed in the back part of the Arm. If therefore the first of these be wounded, which having past the Elbow, appears, and is seen un∣der the Skin, and runs under another, which extends the Wrist, which being divided in∣to four Tendons, runs to all the Joints of all the Fingers, and extends them; the Motion cau∣sing these Extensions will be frustrate. The second Muscle, by which the Palm is formed, having the same Original with the former, is to be seen under the Skin with the first, proceed∣ing underneath to the Hand; this is that, by which the little Finger is drawn aside from the rest; therefore, if this Muscle is wounded, and the Wound be made in the lower Region, the Function of the little Finger
will be hurt; but if it be made a little above, the Function of the three next Fingers then suffer.