. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN FIGURE 10. Goldfish. NPL at its interface (IN) with the PL. From same tissue block as in Figure 5 but at a lower power. Note that the penetration of tannic acid into the intercellular space is limited by the zonula occludente (O). Cross section of intermediate filaments (F). A few microtubules (asterisk). Zonula adherente (A). Scale: micron. Highly noteworthy is the existence of cellular interdigitations in the NPL of fish. These are of a type and orientation similar to those seen in mammals (ref- erences listed in th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN FIGURE 10. Goldfish. NPL at its interface (IN) with the PL. From same tissue block as in Figure 5 but at a lower power. Note that the penetration of tannic acid into the intercellular space is limited by the zonula occludente (O). Cross section of intermediate filaments (F). A few microtubules (asterisk). Zonula adherente (A). Scale: micron. Highly noteworthy is the existence of cellular interdigitations in the NPL of fish. These are of a type and orientation similar to those seen in mammals (ref- erences listed in the Introduction). The interdigitation in teleosts is on a one-to- one basis as demonstrated by the fortuitous association of light and dark cells. Tormey (1963, 1964) and Kaye and Pappas (1965) made the same type of obser- vations in the rabbit ciliary epithelium. Equally significant, the barrier of zonulae occludentes and associated zonulae adherentes found at the apex of the NPL of mammals (Bairati and Orzalesi, 1966; Shabo and Maxwell, 1972; Uusitalo et al., 1973; Raviola, 1974; Okisaka, 1976b) is found also in fish. Though none of the usual tracers were used in the present investigation, the happenstance of limited tannic acid penetration between plasma membranes validates this interpretation. The NPL shows all the fine structure usually seen in secretory cells. There is a plentiful supply of membranous organelles such as Golgi apparati, endoplasmic reticulum (rough and smooth), mitochondria, and granules filled with particulate material. The PL is packed with the melanin granules and shows almost none of the morphology usually associated with metabolic or secretory activity. The basal-lat- eral surfaces of the cells show a mild degree of interdigitation but in no way approach the complexity seen, for example, in the monkey (Okisaka, 1976a). One of the prime "road blocks" found in the current literature is the commonly held belief that the zonulae occludentes junct
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
