Fig. 4 in Hitherto undescribed interommatidial exocrine glands in Chilopoda

Fig. 4. Transmission electron micrographs (TEM), showing fine structural organisation of the interommatidial exocrine gland within the lateral compound eye of Lithobius forficatus. A. Transverse section through proximal region of one secretory gland cell containing typical glandular organelles. The gland cell lobe is surrounded by dense layers of covering and proximal (basal) retinula cells. B. Transverse section through distal region of two neighbouring, unequally sized secretory gland cells; the upper one being penetrated by a small proximal process of the canal cell with the cuticular gland ductule. C. Oblique-transverse section through a triangular interstitium in distal eye region. Two neighbouring, but not yet fused canal cells fill the interommatidial space and are surrounded by covering cells and distal retinula cells. D. Transverse section through middle part of one canal cell containing axially placed cuticular gland ductule. ax = nerve bundle, cc = canal cell, co = cornea, coc = covering (interommatidial pigment) cells, dic = dictyosome, du = cuticular gland ductule, gc = secretory gland cell, mt = mitochondrium, nu = nucleus, pro = cuticular projections, rc = retinula cell, rER = rough endoplasmatic reticulum, sv = secretory vesicle.