. Practical electricity in medicine and surgery. Fig. 140.—Bilateral Contraction of the Frontalis Muscle. 164 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. The post-auricular branch of the facial is reached where itwinds around the auricle, as shown in Fig. 138. Effects : Todraw the pinna upward and backward, and to depress the scalpposteriorly. The branches to the stylo-hyoid and digastric muscles canonly rarely be stimulated singly. The motor points are situatednear to each other, and the muscles usually contract FlQ. 141.—BILATERAL CONTRACTION OF THE CORRUGATOR SCPERCILII MUSCLE
. Practical electricity in medicine and surgery. Fig. 140.—Bilateral Contraction of the Frontalis Muscle. 164 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. The post-auricular branch of the facial is reached where itwinds around the auricle, as shown in Fig. 138. Effects : Todraw the pinna upward and backward, and to depress the scalpposteriorly. The branches to the stylo-hyoid and digastric muscles canonly rarely be stimulated singly. The motor points are situatednear to each other, and the muscles usually contract FlQ. 141.—BILATERAL CONTRACTION OF THE CORRUGATOR SCPERCILII MUSCLES. The contraction of the attrahens and attollens auriculum isreadily stimulated by pressing the electrode on the zygomaticprocess of the temporal bone, on which the branches of thefacial going to those muscles are found. The effect is to drawthe auricle upward and forward. The frontalis muscle is stimulated to contraction through MOTOR POINTS OF HEAD AND FACE. 165 the facial branch which runs superficially from the zygoma overthe temporal region. Effect: The skin of the forehead is throwninto numerous transverse folds. (See Fig. 140.) In old per-sons the folds are more prominent and numerous. The browsare drawn slightly upward and the folds are curved downwardin the centre of the forehead if the contraction is bilateral.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
