. On the anatomy of vertebrates [electronic resource] . stance of certain viscera — as, e. g. the heart in theBullock and some other large quadrupeds. Strong membranes,called 6 aponeurotic, and certain tendons, become bony in someanimals; as, e. g. the 4 tentorium in the Cat, the temporal fasciain the Turtle, the £ leaders of the leg-muscles in the Turkey, thenuchal ligament in the Mole, and certain tendons of the abdominalmuscles of the Kangaroo, which, so ossified,are called the ( marsupial-bones. The pri-mary classification of the parts of the osseoussystem is, therefore, according to their
. On the anatomy of vertebrates [electronic resource] . stance of certain viscera — as, e. g. the heart in theBullock and some other large quadrupeds. Strong membranes,called 6 aponeurotic, and certain tendons, become bony in someanimals; as, e. g. the 4 tentorium in the Cat, the temporal fasciain the Turtle, the £ leaders of the leg-muscles in the Turkey, thenuchal ligament in the Mole, and certain tendons of the abdominalmuscles of the Kangaroo, which, so ossified,are called the ( marsupial-bones. The pri-mary classification of the parts of the osseoussystem is, therefore, according to their pre-valent position, as in the cases above superficial or skin-bones constitute the4 dermo-skeleton;1 the deep-seated bones, inrelation to the nervous axis and locomotion,form the f neuro-skeleton;2 the bones con-segment of neuro- and deimo- nected with the sense-organs and viscera skeletons, Ostracion „ , , , i l , i n ■ l ^ lorm the splancnno-skeleton ;6 those de-veloped in tendons, ligaments, and aponeuroses, the 1 Gr. derma, skin, and skeleton. 2 Gr. neuron, nerve, and skeleton. 3 Gr. splagchnon, viscus, or inward part, and skeleton. 4 Gr. scleros, hard, and skeleton. ANATOMY OF VERTEBRATES. 27 In the arrangement of the parts of the dermo-, splanchno-, andsclero-skeletons, no common pattern is recognisable. One canbnt discern a purpose gained by such bony plates, cases, or rods,in special relation to the habits and well-being of the creaturesmanifesting them; but the diversity in the number, size, shape,and relative position of dermal, tendinal, and visceral bones seemsinterminable. The neuro-skeleton, which is the main part of theosseous system, and might be termed the ( skeleton proper, ex-emplifies not only the principle of design and adaptation, butthat of unity of composition. Its parts are arranged in a seriesof segments following and articulating with each other in thedirection of the axis of the body. § 14. Type segment or verte
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