Organic and functional nervous diseases; a text-book of neurology . axones arise, some of which enter the lemnis-cus of the same side, but many of which cross the median line to enterthe lemniscus of the opposite side and ascend in it; 12 terminates inthe ventral nucleus about a neurone body. This body sends its axoneto the collection of neurones lying within the deep transverse fibres ofthe pons, the trapezoid body. These neurone bodies in turn send theiraxones into the lemniscus of the same and of the opposite side; 13terminates about a neurone body in the ventral nucleus. The bodysends an a
Organic and functional nervous diseases; a text-book of neurology . axones arise, some of which enter the lemnis-cus of the same side, but many of which cross the median line to enterthe lemniscus of the opposite side and ascend in it; 12 terminates inthe ventral nucleus about a neurone body. This body sends its axoneto the collection of neurones lying within the deep transverse fibres ofthe pons, the trapezoid body. These neurone bodies in turn send theiraxones into the lemniscus of the same and of the opposite side; 13terminates about a neurone body in the ventral nucleus. The bodysends an axone directly into the lemniscus of the same side ; 14 passesthrough the ventral nucleus and crosses in the trapezoid from theopposite side, where it turns upward in the lemniscus. It is thus evident that all the fibres of the acoustic nerve, so far asits cochlear division is concerned, transmit their impulses into thelemniscus of the same or of the opposite side. The trapezoid fibresmay be termed the acoustic decussation or chiasm, and, as in the optic Fig. Diagram of the course of the auditory tract. VTTT, auditory nerve nuclei and fibres ; fra, fascicu-lus reflectorius acustieus; cts, corpus trapezoides ; ols, olive superior; cpb, corpus paratrigeminus;cap, corpus quadrigeminus posterior ; crja, corpus quadrigeminus anterior ; cgm, corpus geniculatumanterior; brp, brach. conjunctivum; Ihal, thalamus. (Jacob.) chiasm, the majority of the fibres cross to the opposite side (X). Thetermination of fibres ascending in the lemniscus is very complex, (a)Some fibres terminate about the cells of the nucleus lemuisci in thepons (Nu) which nucleus in turn sends axones to the corpora quadri-gemina of the same and of the opposite side (15). (6) Some fibresterminate about the large quadripolar cells of the posterior corpusquadrigeminum (16) (CQP). (c) Some fibres terminate about the largecells of the first layer of cells in the anterior corpus quadrigeminum(17) (CQA). (d) Many fibres
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