. A system of anatomy for the use of students of medicine (Volume 1). e principal effort seems to be made by the tibialis anticus, andthe muscles on the front of the leg; and the extensor muscles onthe front of the thigh. Notwithstanding these facts, the action of the gastrocnemiusand soleus is essential whenever we raise the heel from theground, while the weight of the body presses on the front part ofthe foot; and it then acts with a force which equals, if it doesnot exceed, the weight of the body. Jumping, at the first view of it, appears an extraordinary ope-ration; but if a man who lies o
. A system of anatomy for the use of students of medicine (Volume 1). e principal effort seems to be made by the tibialis anticus, andthe muscles on the front of the leg; and the extensor muscles onthe front of the thigh. Notwithstanding these facts, the action of the gastrocnemiusand soleus is essential whenever we raise the heel from theground, while the weight of the body presses on the front part ofthe foot; and it then acts with a force which equals, if it doesnot exceed, the weight of the body. Jumping, at the first view of it, appears an extraordinary ope-ration; but if a man who lies on the ground, with his feetagainst a wall, makes a muscular exertion, such as is necessaryfor jumping, the nature of the operation is very intelligible. Itis a sudden extension of the feet and knees, and sometimes of thetrunk of the body. The stroke is made against the wall; but asthat does not yield, the whole motion is impressed upon thebody; which is projected from the wall horizontally in thesame way that in jumping, it is projected from the ground 365 EXPLANATION OP PLATES VI. AND VII. Plate VI. Fig. 1. The Muscles immediately under the common teguments on the an-terior part of the body are represented on the right side; and on the leftside the Muscles are seen which come in view when the exterior onesare taken away. A, The frontal muscle. B, The tendinous aponeurosis which joins it tothe occipital; hence both are named occipito-frontalis. C, Attollens , The ear. E, Anterior auris. F F, Orbicularis palpebrarum. G, Le-vator labii superioris alseque nasi. H, Levator anguli oris. I, Zygomati-cs minor. K, Zygomaticus major. L, Masseter. M, Orbicularis , Depressor labii inferioris. O, Depressor anguli oris. P, , Platysma myoides. RR, Sterno-cleido-mastoideus. S, Part of thetrapezius. T, Part of the scaleni. Superior Extremity.—U, Deltoides. V, Pectoralis major. W, Partof the latissimus dorsi. X X, Biceps flexor cubiti. Y Y, Part of the
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