. Anatomy, descriptive and applied. Anatomy. 368 THE MUSCLEiS AND FASCIA outer ano-le of the eyelids, which give rise in old age to the so-called "crow's ; The Levator palpebrae is the dii-ect antagonist of this muscle; it raises the upper eyelid and exposes the globe of the eye. The Corrugator supercilii draws the eyebrow downward and inward, producing the vertical wrinkles of the forehead. It is the "frowning" muscle, and may be regarded as the principal agent in the expression of suiTering. The Tensor tarsi draws the eyelids inward and compresses the eyelids and the
. Anatomy, descriptive and applied. Anatomy. 368 THE MUSCLEiS AND FASCIA outer ano-le of the eyelids, which give rise in old age to the so-called "crow's ; The Levator palpebrae is the dii-ect antagonist of this muscle; it raises the upper eyelid and exposes the globe of the eye. The Corrugator supercilii draws the eyebrow downward and inward, producing the vertical wrinkles of the forehead. It is the "frowning" muscle, and may be regarded as the principal agent in the expression of suiTering. The Tensor tarsi draws the eyelids inward and compresses the eyelids and the extremities of the lacrimal canals against the surface of the globe of the eye; thus placing the canals in the most favorable situation for receiving the tears. It serves, also, to compress the lacrimal sac. FRONTAL SrNUS. 4f TENSOR nighmore: ORBITAL portion OF ORBICULARIS PALPEBRARUM Fig. 289.—The three portions of the Orbicularis palpebrarum muscle, and the relation of this muscle to the Corrugator supercilii muscle, seen from behind. (Left side.) (Toldt.) 4. The Orbital Region (Fig. 291). Levator palpebrae superioris. Rectus internus. Rectus superior. Rectus externus. Rectus inferior. Obliquus oculi superior. Obliquus oculi inferior. Dissection.—To open the cavity of the orbit, remove the skullcap and brain; then saw through the frontal bone at the inner extremity of the supraorbital ridge, and externally at its junction with the malar. Break in pieces the thin roof of the orbit by a few slight blows of the hammer, and take it away; drive forward the superciliary portion of the frontal bone by a smart stroke, but do not remove it, as that would destroy the pulley of the Obliquus superior. When the fragments are cleared away, the periosteum of the orbit will be exposed; this being removed, together with the fat which fills the cavity of the orbit, the several muscles of this region can be examined. The dissection will be facilitated by distending the globe of the eye. In
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
