346 NERVOUS SYSTEM. 
The fasciculus cuneatus (¢) passes laterad on account of the 
width of the fourth ventricle and appears to end at the area 
ovalis (/), but it may be seen passing beneath the area ovalis, 
emerging at its cranial border and turning dorsad to enter the 
cerebellum. It forms the side walls of a part of the shallow 
fourth ventricle. ; 
The lateral funiculi are divided by longitudinal furrows into 
three divisions. The dorsal one of these is the fasciculus 
cuneatus lateralis or column of Rolando (Fig. 141, g). It 
accompanies the fasciculus cuneatus into the cerebellum. 
The entire mass formed by the fasciculus gracilis, the 
fasciculus cuneatus medialis, and fasciculus cuneatus lateralis is 
known as the corpus restiforme, and since its fibres pass into 
the cerebellum it is sometimes known as the pedunculus cere- 
belli (or crus cerebelli ad medullam). 
The following cranial nerves arise from the medulla oblon- 
gata (Fig. 138). 
The twelfth nerve (X//) (N. hypoglossus) arises by ten 6r 
fifteen rootlets from the ventral surface of the medulla oblon- 
gata in the anterior lateral fissure (7) opposite the caudal por- 
tion of the area elliptica (7). 
The eleventh cranial nerve (X/) (N. accessorius) arises by 
numerous rootlets from the lateral surface of the medulla 
oblongata and of the spinal cord as far caudad as the sixth or 
seventh cervical nerve. These rootlets join to form a nerve 
which enters the cranium through the foramen magnum and is 
closely associated at its point of exit with the glossopharyngeal 
(ZX) and vagus (X°) nerves. The line of origin on the medulla 
passes between the dorsal and ventral roots of the cervical 
nerves and is along the middle of the lateral white funiculi. 
The tenth cranial nerve (X) (N. vagus) arises by about 
eighteen very delicate rootlets from the surface of the area 
ovalis. The rootlets are divided into a dorsal and a ventral 
series. The dorsal series (about twelve) arise in the groove 
which separates the fasciculus cuneatus medialis from the 
fasciculus cuneatus lateralis. The ventral series arise somehat 
ventrad of this groove. These rootlets are to be distinguished 
from those of the ninth nerve by their smaller size. 
