. A treatise on diseases of the eye . ally, pass to thetissues of the cheek., forming the malar division of the orbicularispalpebrarum muscle. EYELIDS 45 Muscle of Riolani.—This is a well-pronounced bundle of musclefibers which passes between the hair bulbs at the margin of the lids. Tensor Tarsi Muscle (Horners Muscle).—A band of fibers arisesfrom the lachrymal bone just back of the lachrymal sac, some of thefibers being attached to the inner ends of the tarsi, some encircling thetear ducts, and some mingling with the more superficial fibers. Thisfasciculus is the tensor tarsi muscle (Horners
. A treatise on diseases of the eye . ally, pass to thetissues of the cheek., forming the malar division of the orbicularispalpebrarum muscle. EYELIDS 45 Muscle of Riolani.—This is a well-pronounced bundle of musclefibers which passes between the hair bulbs at the margin of the lids. Tensor Tarsi Muscle (Horners Muscle).—A band of fibers arisesfrom the lachrymal bone just back of the lachrymal sac, some of thefibers being attached to the inner ends of the tarsi, some encircling thetear ducts, and some mingling with the more superficial fibers. Thisfasciculus is the tensor tarsi muscle (Horners muscle); it is a deep headof the orbicularis palpebrarum muscle. This fasciculus serves to drawthe lids inward and to slightly compress the lachrymal sac and is called into action to a slight degree in connection with the palpebralportion of the orbicularis palpebrarum, in gentle movements of the lids,as in winking. In forcible closure of the lids all of the fibers of theorbicularis palpebrarum participate. Fig. 20. IP L ( i)alpeljiaruin. The palpebral and orbital portions arc easily rccoKiiizcd, liiouglithe line of separation is not always to be seen: C. S., points to the corrugator supercilii; /. P. L.,internal palpebral ligament; E. P. L., position of external palpebral ligament. (After Ilenle.) Corrugator SSupcrcilii.—A small muscle known as the corrugatorsupercilii arises from the superciliary ridge near the median line. Itsfibers run between those of the frontalis and orbicularis, and are insertedinto tile skin near the middle of the upj)er margin t)f the orbit. Thecontra(;tion of this muscle serves to throw the skin of the brow intovertical folds, and is called into action in the act of frowning. Thesemuscles are innervated by the facial nerves. Tarsal Plates.—Lying beneath the orbicularis palpebrarum muscleare the tarsal plates, which measure ai)()iit 20 mm. in leiiglh. Theupper plate measures 9 mm. in width and to 1 mm. in thickne
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteyediseases, bookyear
