Human anatomy, including structure and development and practical considerations . the correspondingnucleus of the trigeminus. Thespinal nucleus is closely associatedwith a conspicuous longitudinaltract of caudally directed fibres,the fasciculus solitarius(tractus solitarius), so called on account of the apparent isolation of the bundle whenviewed in transverse sections (Fig. 927). That such, however, is not the case isevident when the fact is recalled that the fibres which turn downward to form the tractare accompanied by the spinal nucleus of reception, around whose cells they end. Thefascicu
Human anatomy, including structure and development and practical considerations . the correspondingnucleus of the trigeminus. Thespinal nucleus is closely associatedwith a conspicuous longitudinaltract of caudally directed fibres,the fasciculus solitarius(tractus solitarius), so called on account of the apparent isolation of the bundle whenviewed in transverse sections (Fig. 927). That such, however, is not the case isevident when the fact is recalled that the fibres which turn downward to form the tractare accompanied by the spinal nucleus of reception, around whose cells they end. Thefasciculus solitarius extends from the upper border of the medulla to the level of thelower limit of the decussation of the fillet and is related to the sensory fibres of threenerves. The first of these, the facial, contributes only a limited number of fibres thatoccupy the uppermost part of the bundle ; the second, the glosso-pharyngeal, forms byfar the largest constituent of the fasciculus ; whilst the third, the vagus, adds fibresthat course within the lowest segment of the Diagram showing connections of root-fibres of glosso-pharyngealand pneumoicaslric nerves and of sensory fibres of facial; sensoryfibres are black, motor ones red; y//, geniculate ganglion; /,V,A, ganglia of ninth and tenth nerves; DN, dorsal nucleus; /^S,fasciculus solitarius, accompanied by column of gray matter; /VA,nucleus ambiguus; ^cK, accessory vagus (bulbar portion of AY);AfJ^, median fillet. Central and Cortical Connections of the Motor Part of the Glosso-Pharyngeal Nerve.—The motor fibres of the glosso-pharyngeal nerve are the axones of the motor neurones situated 1262 HUMAN ANATOMY. uilliin lliL dorsal nucleus and tlic nucleus ambiguus. Ilic iiiiuli nurvc shares lliese motornuclei to only a limited extent, such of its tihres as are elTerent arising from the uppermost partof the cell-colunnis. Those taking (jrigin from the nucleus ambiguus pass at first toward tliefloor of the fourth ventricle
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
