. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 DONALD M. MAYNARD tapm B amm. amm lig &££—sn I FIGURE 3. Anterior ramifications of Callincctcs ornatus; fresh material. Dorsal exposure with digestive system removed. A, medial, posterior branch of anterior ramifications; al, musculus adductor lateralis mandibulae; amm, musculus abductor maior mandibulae, only cut segments at origin and insertion remain; the belly has been removed to expose underlying structures. Apm, apophysis of mandible; ARc, location of neuron cell body in anterior ramifi- cations; B, anterior, l
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 DONALD M. MAYNARD tapm B amm. amm lig &££—sn I FIGURE 3. Anterior ramifications of Callincctcs ornatus; fresh material. Dorsal exposure with digestive system removed. A, medial, posterior branch of anterior ramifications; al, musculus adductor lateralis mandibulae; amm, musculus abductor maior mandibulae, only cut segments at origin and insertion remain; the belly has been removed to expose underlying structures. Apm, apophysis of mandible; ARc, location of neuron cell body in anterior ramifi- cations; B, anterior, lateral branch of anterior ramifications; end, endopleurite of last head segment; li, lateral integumentary nerve; lig, ligament; mdp, musculus dorsoventralis posterior; mpllm, musculus promoter II maxillae; n, anterior dorsolateral nerve of Echalier (1959); pcllm, musculus proximalis coxopoditis II maxillae; ri, recurrent integumentary nerve; rpllm, musculus respiratorius primus II maxillae; rsllm, musculus respiratorius secundus II maxillae; sn 1, first segmental nerve; tapm, stump of tendon of musculus adductor posterior mandibulae. Note how one anterior branch of anterior ramifications spreads over anterior nerve and con- tinues beneath the head apodeme. In Ocypode this branch leads to another more lateral ramification (Fig. 5), but in other species the second ramification seems lacking and branch B disappears among muscles and membranes of the lateral, anterior carapace. The AR are obviously located in a portion of the venous sinus system. Al- though the course of haemolymph flow has not been accurately determined in these regions, fluid probably passes over the ramifications as it travels from the general anterior venous sinuses of the thorax to the branchial sinuses in the gills. Perhaps of equal significance is the location of the AR in close proximity to the major respiratory muscles of the scaphognathite. Between them, therefore, the AR and PO are located just upst
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