200 ELEMENTS OF MAMMALIAN ANATOMY. 
The direct cerebellar tract occupies the superficial region 
of the cord laterad of the posterior cornu of gray matter. 
Its fibers originate from the cells of 
the more central portion of the gray 
matter throughout the cord and ter- 
minate in the cerebellum. Its fibers 
help to form the inferior peduncle of 
the cerebellum. 
The antero-lateral descending 
cerebellar tract occupies the super- 
ficial area ventrad of the anterior 
gray matter. Its fibers 
originate in the cells of the cerebel- 
lum and extend caudad in the cord. 
The antero-latcral ascending cere- 
bellar or Gowers’s tract occupies the 
superficial area laterad of the ante- 
Its fibers probably origi- 
horn of 
DIAGRAM OF 
TRACTS. 
Fic. 
103. 
Some [IBER 
DorsaL ASPECT. 
al, Antero-lateral ascend- 
ing cerebellar tract; c¢, 
posterior corpus quad- 
rigeminum; cer, lateral 
lobe of cerebellum, 
whose median portion 
rior horn. 
is removed; cg, the two 
fasciculi gracilis and cu- 
neatus represented as 
one; cp, crossed pyra- 
midal or chief motor 
tract; cp’, crossed pyra- 
midal tract in the re- 
gion of the cerebral 
peduncle; dc, direct 
cerebellar tract; fi, the 
large part of the fillet 
derived from nc; ne, 
nuclei gracilis and cu- 
neatus; s, decussation 
of pyramidal tracts; 
a”, sensory or superior 
pyramidal decussa- 
tion; sp, superior pe- 
duncle of cerebellum. 
nate in the cells of central gray 
matter throughout the cord, and 
largely terminate in the cerebellum. 
The /ateral ground bundle consists 
largely of fibers with a short course, 
many of which are commissural, con- 
necting the two halves of the spinal 
cord. 
The crossed pyranudal tract con- 
tains the longest fibers of any of the 
tracts of the central nervous system 
and occupies a large area just lat- 
erad of the posterior horn of gray 
matter. Its fibers originate in the cortical cells of the brain 
near the crucial sulcus (Fig. 92), and descend as part of the 
internal capsule, through the corpus striatum and laterad of 
