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PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



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Spinal Cord 



FIG. 357. A DIAGRAM DESIGNED TO ILLUSTRATE THE COURSE OF CERTAIN 

 NERVE-TRACTS WITHIN THE CEREBRUM, CRUS, PONS, MEDULLA, AND 

 SPINAL CORD. MODIFIED FROM FLECHSIG. (Ranney.) 



C.N., caudate nucleus ; L.N., lenticular nucleus ; O.T., optic thalamus : G.P., gray matter of the pons ; 

 F.R., formatio reticularis; C.D., corpus dentatum; O, olivary body ; N.C., clavate nucleus; T.N., trian- 

 gular nucleus: C.Q., corpora quadrigemina ; I.C., upper limit of the capsular fibres: m, m, m, motor 

 centres around the fissure of Rolando; c.r., fibres of the " corona radiata." 1, the "pyramidal tract," 

 arising from the motor centres of the cerebrum and terminating in the cells of the anterior horns of the 

 spinal gray substance (13 and 14) ; 2, 3, and 4, fibres connecting the cerebral cortex, the caudate nucleus, 

 and the lenticular nucleus with the gray matter of the pons after decussation, and then prolonged as 

 and 7 to the cerebellum ; o, fibres of the superior cerebellar peduncle ; 6, 7, 8, 9, and 10 show by their 

 colors the tracts with which they are associated, as well as their origin and termination; 11 and 17, the 

 "direct cerebellar tract" of the spinal cord (whose probable termination is not correctly shown in the 

 cut, as it probably ends in the vermiform process) ; 12, the lemniscus or "fillet " tract, connecting the 

 olivary body with the optic thalamus and the corpora quadrigemina: 13, the cells of the cord connected 

 with the direct pyramidal tract ; 14, the cells of the cord connected with the crowed pi/ramidnl tract; 15, 

 fibres of the column of Burdach, terminating superiorly in the triangular nucleus ; 16, fibres of the 

 column of Goll, terminating superiorly in the clavate nucleus ; 19, fibres of the cord which terminate in 

 the so-called " reticular formation " directly ; 18, fibres of the ret. form, going to the cerebellum. 



