A piece in the Principium series.
Look back, look to the present, look to the future.
No original,
A. Clavicular attachment of the sterno-mastoid muscle lying over the internal jugular vein.
B. Subclavian artery in the third part of its course.
C. Vein formed by the union of external jugular, scapular, and other veins.
D. Scalenus anticus muscle stretching over the artery, and separating it from the internal jugular vein.
E. Post-half of omo-hyoid muscle.
F. Inner branches of the brachial plexus of nerves.
G. Clavicular portion of trapezius muscle.
H. Transversalis colli artery.
I. Layer of the cervical fascia, which invests the sterno-mastoid and trapezius muscles.
K. Lymphatic bodies lying between two layers of the cervical fascia.
L. Descending superficial branches of the cervical plexus of nerves.
M. External jugular vein seen under the fascia which invests the sterno-mastoid muscle.
N. Platysma muscle cut on the body of sterno-mastoid muscle.
O. Projection of the thyroid cartilage.
P. Layer of the cervical fascia lying beneath the clavicular portion of the sterno-mastoid muscle.
Q. Layer of the cervical fascia continued from the last over the subclavian artery and brachial plexus of nerves.
