WILLARD: CRANIAL NERVES OF ANOLIS CAROLINENSIS. 95 
2. Second spinal nerve. The ventral root of the second spinal, 
which constitutes the entire nerve, is similar to that of the 3rd spinal, 
being composed of coarse somatic-motor fibers arising from several 
bundles that have their origin in the ventral-horn cells. The 2nd spinal 
is somewhat smaller than the Ist. The rootlets in each case combine 
to form a compact bundle, which passes out through the intervertebral 
foramen and immediately divides into a large dorsal ramus (Plates 2, 
3, spi.d.2) and a smaller ventral ramus (spi.v.2). A lateral ramus 
(spi. 1.2) is given off as a branch of the dorsal ramus. 
The ventral ramus passes ventrad between the neck muscles, where 
it turns abruptly caudad to cross the ventral ramus of the 3rd spinal 
on its median side, giving up a portion of its fibers to that nerve, as 
already mentioned. The rest continues caudad to be distributed to 
the ventral neck muscles in the region of the 4th spinal nerve. 
The dorsal ramus of the 2nd spinal is a large branch, which supplies 
the dorsal and lateral neck musculature. 
3. First spinal nerve. ‘This nerve (Plate 7, fig. 23) has the largest 
number of somatic motor fibers of any yet described. It supplies the 
dorsal muscles with a large dorsal ramus, as does the 2nd spinal, and, 
in addition, sends a good sized branch to the ventral side to innervate 
{the omo-hyoideus and sterno-hyoideus muscles. The large root 
‘trunk passes out between the cranium and the first vertebra. Just 
outside the foramen it divides into ventral and dorsal rami. 
| The ventral ramus (Plates 2, 3, figs. 4, 6, spi. v.1) passes ventrally 
jong the body of the vertebra and gives off one branch supplying the 
ventral cervical musculature, and another that passes between the 
ongus colli and more superficial muscles. The latter then turns 
jlightly dorsad to pass on the dorsal side of X and the sympathetic 
\erve, attaining a position alongside the third root of XII, with which 
-tissometimes loosely bound. From here it passes ventrally (Plates 2, 
|, figs. 5, 6, omo-hy. and stn-hy.) between the omo-hyoideus and 
terno-hyoideus muscles, both of which it richly supplies. 
| The dorsal ramus (spi. d.1). This splits into three branches (Plate 8, 
ig. 6), the lateral (Plate 7, fig. 23, spi. 1.1) is distributed immediately 
) the adjacent muscle, another to the ventral part of the longissimus 
¢ uscle, and the largest to the dorsal neck muscle, a portion being dis- 
outed at once to the muscle lying alongside the vertebra (Plate 7, 
4. 23), while the rest passes into the most dorsal division of the 
ngissimus, where it divides into four small terminal branches, two 
»ssing cephalad and two caudad. 
4. Connections of first three spinal nerves with sympathetic. While 
