NECK. 
general investment; being prolonged without 
interruption, below, into the superficial fascia 
of the chest,—above, into that of the head and 
face. It consists here, as elsewhere, of two 
layers, which have the local peculiarity of 
being separated by the platysma myoides in the 
greater part of their extent. Its deeper layer 
occurs in the form of delicate, scarce, lax, fat- 
less areolar tissue, interposed between the 
Fig. 
567 
proper aponeurosis of the region and the pla- 
tysma myoides, furnishing means for the loose 
gliding of this muscle, and continued, without 
adhesion or sensible change, into the adjoining 
regions. Its subcutaneous layer is of coarser 
materials and of less uniform thickness, is in 
close union with the skin, and follows its move- 
ments : it contains the variable amount of fat, 
which the region presents; and so, though it 
327. 
Transverse horizontal section of the neck, seen from above. 
A, fourth cervical vertebra. 
» cricoid cartilage. 
» pharynx. 
» Medulla spinalis. 
@, prevertebral aponeurosis. 
6, posterior pharyngeal aponeurosis. 
€, middle constrictor. 
d, thyroid body. 
€, sterno-mastoid muscle, in the space behind which 
1s seen a section of the great vessels, and of their 
sheath. 
J, sterno-hyoideus. 
9» Omo-hyoideus. 
h, Sterno-thyroideus, 
#, crico-thyroideus. 
i 
j» trapezius. 
k, splenius. 
l, complexus. 
m, semi-spinalis and multifidus. 
n, levator anguli scapule. 
o, scalenus posticus. 
p, scalenus anticus. 
q, longus colli. 
r, rectus Capitis anticus major. 
s, superior thyroid vessels. 
t, ascending cervical vessels. | 
u, deep cervical vessels. 
v, external jugular vein. 
w, anterior jugular vein. 
#, platysma and superficial fascia. 
