File:The laws and mechanics of circulation, with the principle involved in animal movement (1885) (14595129470).jpg

Identifier: lawsmechanicsofc00trip (find matches)
Title: The laws and mechanics of circulation, with the principle involved in animal movement
Year: 1885 (1880s)
Authors: Triplett, William Harrison, 1836-1890
Subjects: Physiology, Comparative Blood Respiration
Publisher: New York : J. H. Vail
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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nd omo-hyoid muscles ; but with the re-mainder of the phenomenon they can have but little to do,save for running the carriage back again at the end of the per-formance to the place it occupies in a state of rest. Finally,it should be borne in mind, in this connection, that when theorgan is thus projected to the extremest limit in extension, it 488 DUALISM DEMONSTRATED. still retains perfect control of all its parts, else the movementsin the end of the organ conld not be produced for seizing theinsect, nor the sheaths be returned and folded up upon thestile ; so that in no sense can the action be regarded as a pas-sive one, or the product of a single force simply ; on thecontrary, it is product of a dual force subject to the volition ofthe animal, and involving perfect coordination in all the partsfor effecting it. Concerning the Action in the Penis.—This power in nervousforce for producing expansion in the muscles, elastic andfibrous tissues would explain the phenomena in the penis,
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Pig. 203.—Tongue of Chameleon, when in action.—Jones. hitherto inexplicable, making this also plain and easily under-stood, the means to ends being very perfect. Anatomy: Briefly, the penile organ is composed of a massof erectile tissue, in form of three cylindrical compartments,known as corpora cavernosa (which occupy the upper surface)and corpus spongiosum (containing the urethra), the lowersurface, occupying the central groove formed by the corporacavernosa, expanding over the ends to form the glans penis,which is firmly secured in position by means of connective-tissue fibres. The several bodies are contained in a separatesheath, com posed of elastic and fibrous tissue similar to theelastic coat in the arteries (Fig. 204, h), dense and thick, andclosely bound together from the intermingling of the fibresalong the sides, while within this outer tunic is a muscularcylinder, the two intimately interblending to form the com-mon wall (h). From the interior of this sheath (tunicaalb

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