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C. Common carotid artery with the vagus nerve at its outer side, and the descendens noni nerve lying on it.
D. External carotid artery.
E. Internal carotid artery with the descendens noni nerve lying on it.
F. Lingual artery pa.s.sing under the fibres of the hyo-glossus muscle.
G. Tortuous facial artery.
H. Temporo-maxillary artery.
I. Occipital artery crossing the internal carotid artery and jugular vein.
K. Internal jugular vein crossed by some branches of the cervical plexus, which join the descendens noni nerve.
L. Spinal accessory nerve, which pierces the sterno-mastoid muscle, to be distributed to it and the trapezius.
M. Cervical plexus of nerves giving off the phrenic nerve to descend the neck on the outer side of the internal jugular vein and over the scalenus muscle.
N. Vagus nerve between the carotid artery and internal jugular vein.
O. Ninth or hypoglossal nerve distributed to the muscles of the tongue.
P P. Branches of the brachial plexus of nerves.
Q. Subclavian artery in connexion with the brachial plexus of nerves.
R R. Post scapular artery pa.s.sing through the brachial plexus.
S. Transversalis humeri artery.
T. Transversalis colli artery.
U. Union of the post scapular and external jugular veins, which enter the subclavian vein by a common trunk.
V. Post-half of the omo-hyoid muscle.
W. Part of the subclavian vein seen above the clavicle.
X. Scalenus muscle separating the subclavian artery from vein.
Y. Clavicle.
Z. Trapezius muscle.
1. Sternal origin of sterno-mastoid muscle of left side.
2. Clavicular origin of sterno-mastoid muscle of right side turned down.
3. Scalenus posticus muscle.
4. Splenius muscle.
5. Mastoid insertion of sterno-mastoid muscle.
6. Internal maxillary artery pa.s.sing behind the neck of lower jaw-bone.
7. Parotid duct.
8. Genio-hyoid muscle.
9. Mylo-hyoid muscle, cut and turned aside.
10. Superior thyroid artery.
11. Anterior half of omo-hyoid muscle.
12. Sterno-hyoid muscle, cut.
13. Sterno-thyroid muscle, cut.
[Ill.u.s.tration: Right side of the head and neck, showing blood vessels, muscles and other internal organs.]
Plate 5
PLATE 6.
A. Root of the common carotid artery.
B. Subclavian artery at its origin.
C. Trachea.
D. Thyroid axis of the subclavian artery.
E. Vagus nerve crossing the origin of subclavian artery.
F. Subclavian artery at the third division of its arch.
G. Post scapular branch of the subclavian artery.
H. Transversalis humeri branch of subclavian artery.
I. Transversalis colli branch of subclavian artery.
