. Human physiology (Volume 1) . number in the upper eyelid, and twenty-five or thirty in thelower. They are in particular furrows between the tarsal fibro-cartilages and the conjunctiva, and secrete a sebaceous fluid,called by the French chassie, in the dry state ; by the GermansAu gen butter, ( eyebutter), and by us, gum of the eye,Which serves the purposes of the follicular secretions in general. The arrangement of the eye-lids differs in different several, both eyelids move;but, in others, only one; eitherthe lower rising to join the up-per, or the upper descending tomeet the low
. Human physiology (Volume 1) . number in the upper eyelid, and twenty-five or thirty in thelower. They are in particular furrows between the tarsal fibro-cartilages and the conjunctiva, and secrete a sebaceous fluid,called by the French chassie, in the dry state ; by the GermansAu gen butter, ( eyebutter), and by us, gum of the eye,Which serves the purposes of the follicular secretions in general. The arrangement of the eye-lids differs in different several, both eyelids move;but, in others, only one; eitherthe lower rising to join the up-per, or the upper descending tomeet the lower. In the sun-fish — tetraodon mola — theeyelid is single and circular,with a perforation in the cen-tre, which can be contractedor enlarged, according to cir-cumstances. In many animals,again, there is a third eyelid,called the nictitating mem-brane, which is of a more de-licate texture and more largelysupplied with bloodvessels;and in some animals is trans-parent. In birds it exists,is at the inner angle of the Fis. Muscles of the A small fragment of ihe sphenoid bone aroundentrance of optic nerve into orbit. 2. Optic, Globe of eye. 4. Levator palpebral muscle.•5. Superior oblique muscle. 6. Its cartilaginouspulley. 7. Its reflected tendon. 8. Inferior ob-lique muscle, the small square knob at its com-mencement is a piece of its bony origin broken Superior rectus, 10. Internal rectus almostconcealed by optic nerve. 11. Part of externalrectus, showing its two heads of orisin. 12. Ex-tremity of external rectus at its insertion ; theintermediate portion of muscle having been re-moved. 13. Inferior rectus. 14. Tunica albugineaiormed by expansion of tendons of four recti. and is well seen in the owl. It Memoires de la Societe Medicale dEtnulation, vol. vii., Paris, Elementaire, i. 52. ACCESSORY ORGAN OF VISION. 195 eye, and is capable of being drawn over the ball like a curtain,by two particular muscles, and of thus freeing the su
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
