. A treatise on diseases of the eye . ptyinginto the ophthalmic vein. Nerve Siipply.—The lach-rymal gland is innervated bythe lachrymal nerve, a branchof the first division of thefifth. In the gland branchesare given ofl: which supply the upper outer portion of the pierce the external palpebral ligament and pass to the integumentof the upper eyelid, anastomosing with branches from the facial nerve. Lachrymal Secretion.—Under ordinary conditions the quantity oflachrymal fluid secreted is dissipated by evaporation, very little passinginto the lachrymal canals; but when the f
. A treatise on diseases of the eye . ptyinginto the ophthalmic vein. Nerve Siipply.—The lach-rymal gland is innervated bythe lachrymal nerve, a branchof the first division of thefifth. In the gland branchesare given ofl: which supply the upper outer portion of the pierce the external palpebral ligament and pass to the integumentof the upper eyelid, anastomosing with branches from the facial nerve. Lachrymal Secretion.—Under ordinary conditions the quantity oflachrymal fluid secreted is dissipated by evaporation, very little passinginto the lachrymal canals; but when the flow is excessive, which occursunder the influence of certain stimuli, the fluid is wafted to the lachrymallake by the motion of the lids, where it passes into the lachrymal the capacity of these channels is overtaxed, the tears (lachrymal fluid)flow over onto the cheek. The lachrymal secretion, according to Arlt,* is composed as follows: Water Chloride of sodium 1. 257 Albumin Salts Trace of fat The laclirymal aijparatus. Kight side. (Gray.) 1 Arch. f. Ophth., 1, 2, p. 137. 52 ANATOMY Fig. 24 Experiments have been made to determine the bactericidal actionof the tears, and positive results have been obtained. Hellberg^ madea series of 22 experiments witli the staphvlococcus. In 16 cases partialor complete destruction of the germs occurred; in 4 cases the germsmultiplied. It was found that boiling destroyed the germicidal con-stituent, demonstrating the fact that this principle must be a volatileor an albuminous sulistance. Conducting Portion.— Laclirymal Papilhr.^The conducting portionof the lachrvmal aj)paratus begins at the small perforated elevations or papilljie (lachrvmal papilla^) situated 4 to 5mm. from the mesial end of the internalcanthus at the point where the free innerborders of the lids end. Lachrymal CanalicuU.—These passages(lachrymal canaliculi) extend almost atright angles to the surface at the papillae,l)ecomi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteyediseases, bookyear
