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EXPLANATION OF PLATE CCCCXVIII.

Fig. 1. Exhibits a view of the exit from the head, and
distribution in the chest, of the great sympathetic nerve,
intended to illustrate the mutual relations between the
head and the principal organs of the chest aud belly.
A. The right parotid gland laid bare.

B. The submaxillary gland.

g.
h, i, k, l. Trunks of some of the cervical nerves.
m. The cardiac plexus formed by branches from the
sympathetic nerve.

The accessory nerve of Willis.

n, n. The par vagum running down to the diaphragm,
through which it passes, unites with the intercostal,
abdominal viscera.

C, D, E. The digastric muscle, partly covered by forms various ganglia, and gives branches to most of the

the submaxillary gland.

F. Part of the thyroid gland.

G, G. The esophagus or gullet.

H, H. The windpipe or trachea.

II. III. IV. V. VI. VII. The bodies of the six lower
vertebra of the neck; VIII. IX. the two first vertebræ
of the back.

I, K, L. The heart, with part of the pericardium at-
tached.

P, p. The arch of the aorta, drawn aside.

9. The common trunk of the right subclavian ()
and right carotid (♥) arteries.

P. The vena cava from the superior parts; Q. That

from below.

R, S, T. The right lobe of the lungs.

U, V. Part of the left lobe.

W, X, Z. Muscular parts of the diaphragm.

a. The first cervical or great ganglion, from which
proceed, b. The trunk of the great sympathetic nerve,
and c. The eighth pair of neves, or par vagum.

d. The lower cervical ganglion, opposite the fifth
cervical vertebra,

e. The upper thoracic ganglion, opposite the first
vertebra of the back.

f. The third dorsal ganglion, between the second and
third rib.

o, o. The phrenic nerves distributed to the dia-
phragm.

Fig. 2. A section of the cuticle of the lilium chalce-
donicum, to shew the lymphatic vessels, much magnified.
Fig. 3. A similar magnified view in the onion.
Fig. 4. Ditto in the pink.

Fig. 5. Represents the atlantal extremity of the slow
lemur (lemur tardigradus), to show the curious divi-
sion of the subclavian artery.

a. The subclavian artery, lying upon the subscapu-
laris muscle.

b. The division of the artery into equal-sized cylin
ders.

c. The ulnar artery proceeding to divide in the usual

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