. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE Lir,iiT-KK( i:n IVE OF BARNACLES. 543 to hold the inner region in position as well as to support the outer covering. In the living specimen the interstices of these fihers are filled with fluid which helps to maintain the contour of the eye. The inner part of the eye is a sphere containing pigmented cells, collagenous fibers, reticular fibers, and visual cells with their nerves. The pigmented region forms a cap over about half of this portion of the eye and lies directly beneath the pigmented region of the outer
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE Lir,iiT-KK( i:n IVE OF BARNACLES. 543 to hold the inner region in position as well as to support the outer covering. In the living specimen the interstices of these fihers are filled with fluid which helps to maintain the contour of the eye. The inner part of the eye is a sphere containing pigmented cells, collagenous fibers, reticular fibers, and visual cells with their nerves. The pigmented region forms a cap over about half of this portion of the eye and lies directly beneath the pigmented region of the outer coat. Beneath this, is an area of rather loose connective tissue fibers and cells similar to those between the outer and inner regions. The rest of the inner eye is composed of a reticulum of connective tissue fibres surrounding two large ganglion or visual cells. A slight division is observable in this o.*. FIG. 4. Diagrammatic drawing of the simple eye of the adult (vertical section X2o). , connective tissue fibres; , inner pigmented cells; ;;.. nerve; , outer non-pigmented cells; , outer pigmented cells; , reticular fibers; visual cells. reticulum, indicating the two units of nervous elements. These two visual cells send off branches which ramify throughout the reticular fibers. Each cell also gives off a nerve fiber which is surrounded by a sheath. These fibers, with their individual sheaths, become united as a double nerve enclosed within a com- mon connective tissue coat before passing through the outer cov- ering and continuing to the supraoesophageal ganglion as the optic nerve. The enlargement of the nerve just prior to its entrance into. 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 Marine Biological Laboratory (Woods Hole, Ma
Size: 1661px × 1504px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
