. Chordate morphology. Morphology (Animals); Chordata. endolymphatic foramen perilymphatic foramen metotic foramen LIZARD fenestra cochleae metotic foramen MAMMAL Figure 13-22. Diagrammatic cross section through the otic capsules of several tetropods showing the variations of inner ear and perilymphatic sac development. (After Cordier and Dolcq, 1945, and Romer, 1955) and lagenar maculae (sensory areas) as well as a macula neglecta (Figure 13-23). There are no otoliths or granules; the currents within the utricular chambers appear to re- place these. The endolymphatic duct is a short, closed t
. Chordate morphology. Morphology (Animals); Chordata. endolymphatic foramen perilymphatic foramen metotic foramen LIZARD fenestra cochleae metotic foramen MAMMAL Figure 13-22. Diagrammatic cross section through the otic capsules of several tetropods showing the variations of inner ear and perilymphatic sac development. (After Cordier and Dolcq, 1945, and Romer, 1955) and lagenar maculae (sensory areas) as well as a macula neglecta (Figure 13-23). There are no otoliths or granules; the currents within the utricular chambers appear to re- place these. The endolymphatic duct is a short, closed tube. In fossil osteostracans and heterostracans the inner ear has two semicircular canals as in the lamprey. In the osteostracans the inner ear is associated with radi- ating canals which out to dorsal and lateral fields. Stensio viewed these fields as filled with electric muscle tis- sue and the canals as occupied by the nerves for these muscles. It has been pointed out that the fields are too small to hold enough muscle to produce an effective shock, therefore, it has been suggested that they were sensory fields for reception of vibratory stimulae and that the canals were endolymphatic duct posterior crista. 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 Jollie, Malcolm. New York, Reinhold
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