. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . xternal tegumentary, an internal mucous, and the inter- 198 END-ORGANS OF THE NERVOUS SYSTEM mediate membrana propria, composed of unyielding fibres arrangedboth radially and circularly. In the inner wall, which separatesthe tympanum from the labyrinth, are two openings or windows—the fenestra ovalis, which corresponds to the vestibule of the laby-rinth, and the fenestra rotunda, which corresponds to the tympanicpassage in the cochlea. Near its anteri
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . xternal tegumentary, an internal mucous, and the inter- 198 END-ORGANS OF THE NERVOUS SYSTEM mediate membrana propria, composed of unyielding fibres arrangedboth radially and circularly. In the inner wall, which separatesthe tympanum from the labyrinth, are two openings or windows—the fenestra ovalis, which corresponds to the vestibule of the laby-rinth, and the fenestra rotunda, which corresponds to the tympanicpassage in the cochlea. Near its anterior part the tympanum opens into (b) the Eustachian tube, a canalwhich communicates with the nasalcompartment of the pharynx. (c) The auditory bones are threein number, called Malleus, Incus, andStapes, and arranged so as to forman irregular chain stretched acrossthe cavity from the outer to theinner wall of the tympanum (see ). The malleus has a head, sepa-rated by a constricted neck from anelongated handle; its handle is con-nected with the centre of the mem-FiQ. 86.—Bones of the Ear, as seen brana tympani; its head articulates. in their connection from in (Henle.) /, Incus (anvil), ofwhich lb is the short, and II thelong, process; c, its body, and pi,the process for articulation with thestapes (processus orbicularis). M,Malleus (hammer), of which Mc isthe neck, Afcpthe head, Ml the longprocess, and Mm the manubrium;S, stapes (stirrup), with its capitu-lum, cp. with the incus. The incus has abody and two processes. On thefront surface of the body is a saddle-shaped hollow, in which the head ofthe malleus fits; the short process isbound by a ligament to the posteriorwall of the tympanum; the long proc-ess ends in a rounded projection {osorbiculare) through which it articulates with the stapes. Thestapes, or stirrup-shaped bone, has a head and neck, a base andtwo crura. The head articulates with the incus; from the con-stricted neck the two crura curve inward
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectpsychophysiology
