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The Body Wall and Musculature of the Marine Triclad Palombiella stephensoni (Palombi, 1938): Part One: General Tissue Structure as seen with the Light Microscope

Plate 1

Plate 1

page 9
Plate 1. The Epidermis

Plate 1. The Epidermis

Fig. 1 Transverse section of the dorsal epidermis stained by the Falg technique and photographed by Nomarski interference microscopy. The nuclei of the cells are large oval structures. The outer 1/3 region of the cells possesses a system of internal "channels" which are perpendicular to the base of the cells.

i.m., region of internal channels; n., nuclei; p., subepidermal pigment; pa., parenchyma.

Fig. 2 Photomicrograph of a portion of dorsal epidermis sectioned tangentially. The section is at a level corresponding to A-B in Fig. 1, and passes through the bases of epidermal cells. Connective fibres enclose the cell bases, giving a polygonal pattern, in which each cell is mostly surrounded by 6 other cells. Stained by Mallory's technique.

cf., connective fibres; cm., cellular material.

Fig. 3 Photomicrograph of a portion of dorsal epidermis sectioned tangentially. The section is at a level corresponding to C-D in Fig. 1. The system of internal "channels" is cut transversely and appears as many small tubes. Secretions from 3 subepidermal eosinophil glands are present. Stained by Mallory's technique and photographed by Nomarski interference microscopy.

im., the region of internal "channels" cut transversely; es., secretion from eosinophil glands.