Archive image from page 602 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( INTERNAL STRUCTURE OF THE PONS. 569 increased in size by the addition of the fibres of the spino-thalamic tract. Further, the floor of the fourth ventricle becomes narrower, and other objects appear in the tegmental substance. The bracMum conjunctivum ( superior cerebellar peduncle) is a very con- spicuous object, in sections, through - the middle and upper parts of the pons. In transverse section it presents a semilunar outline, and as it emerges
Archive image from page 602 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( INTERNAL STRUCTURE OF THE PONS. 569 increased in size by the addition of the fibres of the spino-thalamic tract. Further, the floor of the fourth ventricle becomes narrower, and other objects appear in the tegmental substance. The bracMum conjunctivum ( superior cerebellar peduncle) is a very con- spicuous object, in sections, through - the middle and upper parts of the pons. In transverse section it presents a semilunar outline, and as it emerges from the cerebellum it lies immediately on the lateral side of the fourth ventricle, towards which its concave aspect is turned (Fig. 500). Its dorsal border is joined with the corresponding brachium of the opposite side by the thin lamina of white matter, termed the anterior medullary velum, whilst its ventral border is sunk to a small extent in the dorsal part of the pons. As it is traced upwards it sinks deeper and deeper into the pons until it becomes completely submerged, with the exception of the dorsal border to which the anterior medullary velum is attached. It now lies on the lateral side of the tegmental or reticular substance of the pons, and this position it maintains until the mesencephalon is reached (Fig. 501). About half-way up the pons the nuclei of the trigeminal nerve mark a very Upper end of fourth ventricle Mesencephalic root of the trigeminal nerve Medial longitudinal bundle Anterior medullary velum Gray matter on floor of fourth ventricle Brachium conjunctivum Lemniscus lateralis Formatio reticularis Nucleus lemnisci lateralis Trigeminal nerve -j Commencing decussa- tion of bracnia conjunctiva Lemniscus medialis Transverse fibres Fig. 501.—Section through the Superior Part of the Pons of the Orang, above the Level of the Trigeminal Nuclei. important stage in its tegmental portion. These nuclei are two in number on each side, viz., a large oval termin
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