. A manual of zoology. PHYLUM CHORDATA 357 iris. The rays of light are brought to a focus on the retina mainly by means of the crystalline lens, a firm, glassy body situated within the iris. The cornea also assists in this, as does a gelatinous substance, the vitreous humour, which fills the part of the cavity of the eyeball internal to the lens. The ear in the dogfish is imbedded in the cartilage of the posterior part of the skull (auditory region). It con- sists of a somewhat complicated structure termed the f-. Fig. 220.—Diagrammatic horizontal section of the eye of man. c, cornea; ch,
. A manual of zoology. PHYLUM CHORDATA 357 iris. The rays of light are brought to a focus on the retina mainly by means of the crystalline lens, a firm, glassy body situated within the iris. The cornea also assists in this, as does a gelatinous substance, the vitreous humour, which fills the part of the cavity of the eyeball internal to the lens. The ear in the dogfish is imbedded in the cartilage of the posterior part of the skull (auditory region). It con- sists of a somewhat complicated structure termed the f-. Fig. 220.—Diagrammatic horizontal section of the eye of man. c, cornea; ch, choroid (dotted); C. P, ciliary processes; e. c, epithelium of cornea; e. cj, conjunctiva; , yellow spot; /, iris; L, lens; ON, optic nerve; OS, ora serrata; o-x, optic axis; /. c. R, anterior non-visual portion of retina; P. E, pigmented epithelium (black); R, retina; sp. I, suspensory ligament; Scl, sclerotic; V, H, vitreous body. (From Foster and Shore's Physiology.') membranous labyrinth, with soft walls and an internal epithelium in which the fibres of the auditory nerve termi- nate. Contained in the interior of the labyrinth is a fluid, the endolymph, in which there are suspended particles of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
Size: 1453px × 1720px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900
