1.80 C. WINKLER. THE CENTEAL COURSE 



pulv. th. opt. =r pulvinar tlialami optici. 



c. p. ~ .commissura posterior. 



g. hab. ganglion liabenulae. 



g. interp. ganglion interpedunculare. 



N. E,. nucleus ruber. 



Dec. Br. conj. Decussatio braccli. conjunct, penduncul. cereb. superioris. 



PLATE XII. 



Fig. 17 A, B, and c. Frontal sections through the medulla oblon- 

 gata of a not yet born elder foetus of a rabbit, (a 

 WEIGERT-PAL preparation) showing how far myelinisation 

 of fibres has taken place. A is the most distal, C the 

 most proximal section. 



The abbreviations found here are the same as in pro- 

 ceeding drawings. 



In fig. 17 A. The non medullated layer (9 is found between the two medullated 

 layers of the systema clorsale (stria medullaris) nervi octavi. 



In fig. 1 7 B. The non medullated layer (stratum c corp. tr.) is found between the 

 medullated layers of the systema veutrale nervi octavi. 



In fig. 17 c. The medullated triangular field of the fasciculus spino-cerebellaris 

 ascendens, is making up to take its dorsal way in the lateral fillet. 



PLATE XIII. 



Fig. 18 A F. A series of sagittal sections through the central 

 system of a not yet born elder foetus of a rabbit (a 

 WEIGERT-PAL preparation) showing the myelinisation of 

 the fibres at the time of birth. 



The abbreviations found here are the same as in the proceeding drawings. 



Fig. ISA is a sagittal section just touching the lateral surface of the medulla. Most 

 proximally the nervus trigeminus enters, distally at first the proximal 

 octavus-root is seen, afterwards the distal octavus-root enters. Between 

 them is found the fasc. intermedius radicum. 



Fig. 18s is a dito, somewhat more medially. The corpus trapezoides begins its 

 exfoliation from the nucleus ventralis. The fasciculus intermedius is seen. 



Fig. 18 c is a sagittal section, at the level where the dorsal spino-cerebellar tract 

 (FLECHSIG'S KleinHirn-SeitenstrangBundel) enters into the cerebellum. It 

 is medullated, and crossed by medullated fibres of the ventral root ffoine; 



v o O 



to the stratum latero-dorsale. 

 Fig. 18 D is a sagittal section, at the most medial region of the areaovalis, or at 



the most lateral region of the corpus juxta-restifonne. The medullated 



HELD'S intermediary system is touched as a bundle of longitudinal fibres, 



passing from the strat. latero-dorsale into the corp. trapezoides. 

 Fig. 18 E is a sagittal section, at the level of the facial nucleus. HELD'S system. 



now is a field of queer-sectioned small fibres. The section demonstrates 



the beginning of the tractus DEITEUS descendens. 

 Fig. 18 F is a sagittal section through the lateral end oftliegenuNervifacialis.lt 



demonstrates the curvation in longitudinal direction of the tractus DEITERS 



descendens. 



PLATE XIV and PLATE XV. 



