. Practical electricity in medicine and surgery. Fig. 142.—Bilateral Contraction of the Zygomatics Major. The Contractionof the Orbicularis Palpebrarum is also Shown in the Cut. The expression varies according to the intensity of the contrac-tion from attention to astonishment, surprise, and terror. The corrugator supercilii is easily isolated at the outer angleof the brow. (See Figs. 138 and 141.) Effects: Flatteningand depression of the eyebrows, so that the latter overhang theupper lid. The inner ends of the brows are at the same time 166 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. drawn
. Practical electricity in medicine and surgery. Fig. 142.—Bilateral Contraction of the Zygomatics Major. The Contractionof the Orbicularis Palpebrarum is also Shown in the Cut. The expression varies according to the intensity of the contrac-tion from attention to astonishment, surprise, and terror. The corrugator supercilii is easily isolated at the outer angleof the brow. (See Figs. 138 and 141.) Effects: Flatteningand depression of the eyebrows, so that the latter overhang theupper lid. The inner ends of the brows are at the same time 166 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. drawn upward and inward, throwing the skin into vertical foldsover the glabella. The expressions produced are those of re-flection, sternness, pain, and anger. The orbicularis palpebrarum may be stimulated over themalar bone or the parotid gland. (See Fig. 138.) When thenerve is stimulated before its division into its superior and inferiorbranches the effect is to close the eyelids. The zygomaticus major can be stimulated to contraction at. Fig. 143.—Contraction or the Zygomaticus Minor. the posterior inferior border of the malar bone, near the originof the muscle. Bilateral contraction of this muscle draws theangles of the mouth outward, throws the skin of the cheeksinto arc-like folds, and closes the eyes. (See Fig. 142.) Theexpression caused is that of mirth and laughter, which may beincreased to the point of caricature. The zygomaticus minor can be reached over the junctionof the malar bone with the superior maxilla. Its stimulation isalways painful on account of the infra-orbital branch of thefifth nerve, which is affected by the current. The effect is to MOTOR POINTS OF FACE. 167 raise the upper lip and draw it outward, causing an expressionof dissatisfaction or pain. (See Fig. 143.) The levator labii superioris is difficult to isolate, but cansometimes be picked out on the side of the nose near the motorpoint for the zygomaticus minor. Its contraction raises theupper lip
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
