. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. l62 ANNALS OF THE SOUTH AFRICAN MUSEUM rostrum, op i CO I muscle, pedate process- antennulary nerve. Statol iths remoter muscles Fig. 6o. Lateral dissection of base of left antennule to show disposi- tion of antennulary and statocyst nerves. The left antenna and left compound eye have been excised, and the left apical mtiscle is seen in the middle cylinder of the fused eyestalks. inner and outer fibres of the conspicuous lateral root of the antennulary nerve (fig 58), from which two well-defined bran
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. l62 ANNALS OF THE SOUTH AFRICAN MUSEUM rostrum, op i CO I muscle, pedate process- antennulary nerve. Statol iths remoter muscles Fig. 6o. Lateral dissection of base of left antennule to show disposi- tion of antennulary and statocyst nerves. The left antenna and left compound eye have been excised, and the left apical mtiscle is seen in the middle cylinder of the fused eyestalks. inner and outer fibres of the conspicuous lateral root of the antennulary nerve (fig 58), from which two well-defined branches later separate. Apparently originating in the outer fibres, a comparatively thin antennulary nerve a (fig. 60) provides the main supply to the proximal antennulary muscles; it is directed forward to the promo tor muscle, but also gives off other branches which extend downward to the remoter and abductor muscles. Emerging from the brain slightly postero-ventral to the first branch, the inner and outer fibres continue as a thick antennulary nerve b (fig. 60) which slopes downward through the frontal region of the head and, curving below the dorsal hinge of the antennule, enters the peduncle and travels more or less medially, supplying the various muscles in the three segments. Sections show that throughout their course the inner and outer fibres of antennulary nerve b retain their individuality and separate distally, the inner fibres passing to the inner flagellum, while the outer fibres terminate in the setae and the aesthetascs of the outer flagellum. The conspicuous tegumentary nerve (figs 57, 61) arises dorsally in the trito- cerebrum and splits into several branches, the subdivisions of which fan out to the antero-lateral cephalic hypodermis. On displacing the tegumentary nerve, the more v^entral antennary nerve (figs 31, 57, 585 61) is revealed as a prominent element composed of a number. Please note that these images are extracted from scanned page images that may hav
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
