632 ANIMAL PHYSIOLOGY. 
oblique muscle (motor root). 2. From the nasal branch of the 
ophthalmic division of the fifth. 3. From the carotid plexus 
of the sympathetic. The efferent branches pass to the iris, are 
derived chiefly from the sympathetic, and cause dilatation of 
the pupil. There are also vaso-motor fibers to the choroid, iris, 
and retina. The afferent fibers are sen- 
sory, passing from the conjunctiva, cor- 
nea, etc. 
II. The Nasal or Spheno - Palatine 
Ganglion.The motor root is derived 
from the facial through the great su- 
perficial petrosal nerve; its sympathetic 
root from the carotid plexus. Both to- 
gether constitute the vidian nerve. It 
would seem that afferent impulses from 
the nasal chambers pass through this 
ganglion. The efferent paths are: 1. 
Motor to the levator palati and asygos 
uvule. 2. Vaso-motor, derived from the 
sympathetic. 3. Secretory to the glands 
of the cheek, etc. 
Ill. The Otic Ganglion.—lIts roots 
are: 1. Motor, from the third division. 
2. Sensory, from the inferior division of 
the fifth. 38. Sympathetic, from the 
plexus around the meningeal artery. It 
makes communication with the chorda 
tympani and seventh, and supplies the 
parotid gland with some fine filaments. 
Motor fibers mixed with sensory ones 
pass to the tensor tympani and tensor 
palati. 
Fie 472. — Unipolar cell from = IV. The Submazillary Ganglion. — 
Gasserian ganglion (after 
Schwalbe). N,N, N, nuclei Tts roots are: 1. Branches of the chorda 
of sheath; 7, fiber branch- 
ing at a node of Ranvier. tympani, from which pass (a) secretory 
fibers to the submaxillary and sublingual glands, (b) vaso-mo- 
tor (dilator) fibers to the vessels of the same glands. 2. The 
sympathetic, derived from the superior cervical ganglion, pass-- 
ing to the submaxillary gland. It is also thought to be the path 
of vaso-constrictor fibers to the gland. 3. The sensory, from 
the lingual nerve, supplying the gland substance, its ducts, ete. 
Pathological—1. The motor division of the nerve, when the 
medium of efferent impulses, owing to central disorder, may 
