Plate 2. The Basement Membrane, Muscles, and subepidermal glands

Fig. 1 Sagittal section of dorsal body wall. The "basement membrane" is thick, densely stained and sends "septa" between epidermal cells so that the cells sit in cup-like depressions in the "basement membrane". Mallory Stain.

bm., basement membrane; d., dorsoventral muscle fibres; e., epidermis; pa., parenchyma; s., septum.

Fig. 2 Sagittal section of ventral body wall. The "basement membrane" is a thick, dense line. Circular muscle fibres are separated by fine connective fibres which are continuous with the "basement membrane". Mallory stain.

bm., basement membrane; cm., circular muscle fibres; cf., connective fibres; d., dorso-ventral muscle fibres; e., epidermis; lm., longitudinal muscle fibres; pa., parenchyma.

Fig. 3 Sagittal section of anterior region of the parenchyma. Basiphil and eosinophil glands are present. Both types are long and slender. Mallory stain.

bg., basiphil glands; eg., eosinophil glands; e., epidermis; pa., parenchyma.