DISSECTION OF THE HEAD AND NECK 



357 



Study- 



In the isthmus rhombencephali. 



(1) Interpeduncular ganglion (ganglion inter peduncular e). 



(2) Nucleus of trochlear nerve (nucleus N. trochlearis). 

 In the pedunculus cerebri. 



(A) Tegmentum. 



(1) Central gray layer (stratum griseum centrale). 



(2) Reticular formation (formatio reticularis) . 



(3) Medial longitudinal fasciculus (fasciculus longitudinalis 



medialis) (0. T. posterior longitudinal bundle). 



FIG. 169. 



Coll.sup. 



Aq.cer, 

 St.gr.c, 



a 



Transverse section through mesencephalon, colliculi superiores of corpora quadrigemina and cerebral 



peduncle of new-born babe. (Weigert-Pal, series ii. section No. 384.) 



Aq.cer., aquaeductus cerebri; Coll.sup., colliculus superior; D.t., decussatio tegmenti dorsalis (fon- 

 taineartige Haubenkrcuzung of Meynert); F.l.m., fasciculus longitudinalis medialis; F.Py., fasciculi 

 pyramidales in the basis pedunculi ; F.r.(M), fasciculus retroflexus Meynerti ; L.m., lemniscus medialis ; 

 Nu. F.l.m., nucleus fasciculi longitudinalis medialis or nucleus commissurae posterioris (oberer Octdomo- 

 toriuskern of Darkschewitsch) ; Nu.n.III, nucleus N. oculomotorii ; Nu.r., nucleus ruber ; N.III, N. 

 oculomotorius ; St.alb.p., stratum album profundum; St.gr.c., stratum griseum centrale ; S.n., substantia 

 nigra ; a, region of Flechsig's Fussscfdeife ; /3, temporo-occipital tract to pons ; y, frontal tract from 

 pallium to pons. (From Barker, The Nerv. Syst, New York, 1899, p. 487, Fig. 317.) 



(4) Descending root of trigeminal nerve (radix descendens N. 



trigemini). 



(5) Nucleus of descending root of trigeminal nerve (nucleus 



radicis descendentis N. trigemini = nuclei motorii mi- 

 nor es N. trigemini}. 



(6) Nucleus of oculomotor nerve (nucleus N. oculomo.torii) 



(0. T. nucleus of III. nerve). 



(7) Nuclei of tegmentum (nuclei tegmenti). 



(a) Red nucleus (nucleus ruber). 



(8) Decussations of tegmenta (decussationes tegmentorum) . 



