DISSECTION OF THE HEAD AND NECK 



353 



(19) Restiform body (corpus resti forme) (0. T. inferior cerebellar 



peduncle), 

 (a) Fasciculi of restifonn body (fasciculi corporis restiformis). 



(20) Cerebello-olivary fibres (fibrae cerebelloolivares) . 



(21) Pyramidal fasciculi (fasciculi pyramidales) . 



(22) External arcuate fibres (fibrae arcuatae externae). 



Sections of Pons (Sectiones pontis). 



Make four sections through the pons. (See Spalteholz. Fig. 

 723.) 



FIG. 166. 



Transverse section through isthmus rhombencephali of new-born babe. (Weigert-Pal, series ii. 



section No. 268.) 



Sr.conj., brachium conjunctivum ; C.i., colliculus inferior; y, nucleus described by Westphal as 

 probably concerned in the origin of the N. trochlearis ; F.l.m., fasciculus longitudinalis medialis ; F.Py., 

 fasciculi longitudinales [pyramidales] ; L.I., lemniscus lateralis; L.m., lemniscus medialis; N.IV., 

 decussatio nervorum trochlearium ; N.V., N. trigeminus ; yu.l.l., nucleus lemnisci lateralis; Nu.r.t. 

 nucleus reticularis tegmenti pontis ; R.d. V., radix descendens [meseucephalica] nervi trigemini. (From 

 Barker, The Nerv. Syst., New York, 1899, p. 484, Fig. 314.) 



(1) About at the junction of the pons and the medulla, passing through 



the level of entrance of N. acusticus. 



(2) At the level of the roots of N. facialis and N. abducens. 



(3) At the level of the roots of N. trigeminus. 



(4) Through the velum medullare anterius and the middle of the pons. 



Examine first the unstained cross-sections and subsequently 

 sections, from the same levels, stained by Weigert's method. 



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