. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 598 THE SENSES AND SENSORY ORGANS. Organs.—Graber compares the primitive chordotonal organs of Insects with the outer hair cells of the organ of Corti in the Vertebrata (Fig. 74), and remarks that in both cases the vibrations act vertically upon the membranes, between which the end organs are stretched. In the case of the haemal end organ the a
. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 598 THE SENSES AND SENSORY ORGANS. Organs.—Graber compares the primitive chordotonal organs of Insects with the outer hair cells of the organ of Corti in the Vertebrata (Fig. 74), and remarks that in both cases the vibrations act vertically upon the membranes, between which the end organs are stretched. In the case of the haemal end organ the analogy is still more complete, as in this case it is the movement of the surrounding fluid of the body cavity, which acts upon the membranes supporting the end organ. The diagrams show a very complete accordance between these structures in the Arthropod and the Vertebrate, and make the view he has adopted very plausible. It must, however, be admitted that the representation is extremely diagrammatic in the case of the Vertebrate end organ, and that in details. Fig. 74.—A diagrammatic comparison of the outer hair-cells of Vertebrates with the chordotonal organs of Arthropods, copieil from Graher [286]- A. A diagrammatic representation of one of the outer hair-cells of the organ of Corti after Waldeyer : a, hair-like processes ; /', the hair-cell ; c, nerve fibril; X, minute granule of doubtful nature ; li, supporting cell ; e, basilar membrane ; /, reticular membrane. B. A diagrammatic representation of a primitive chordotonal organ, after Graber : a, outer integument of the larva ; /', chordotonal organ ; r, nerve fibre and ganglion cell; </, chordotonal ligament; jt, chordotonal thread, which Graber compares with x in Fig. A. the Structures are very different. I think, however, that the similarity is sufficient to give a very high degree of probability to Graber's view that these end organs are auditory in Please note that these images are extracted from scan
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