_———-. 2 + ~e, 
i 
\ 
| hi 
\ 
} 
Mh 
Shews from below the cervico-thoracic septum constituting the roof of the thorax, ‘ 
It represents a transverse and horizontal section through the 
passage to the great vessels. 
569 
a 
iN ! 
AVA 
a ia 
and giving 
second intervertebral disc, and parts at the same level. 
A, second dorsal vertebra. 
B, tranverse division of the manubrium sterni. 
C, first ribs. 
D, vertebral extremity of second ribs. 
a, a, fascia, extending between the great vessels 
and first two ribs. 
6, b, its insertion at the first ribs. 
¢, c, its insertion at the second vertebre. 
d,d, lamina between the great vessels, attached 
centrally to them,—in front to the sternum, where 
it forms a cul-de-sac,—and behind to the second 
dorsal vertebra. 
cordance with the general law of its arrange- 
ment for the separation of muscles; is desti- 
tute of any particular surgical interest, and 
forms no exception to the general observations 
given in a preceding article. (See Back.) 
A portion (but a very distinct portion) of this 
great aponeurosis is the pre-vertebral fascia. 
It extends from the occiput—to which it is 
e, the aponeurosis, extending within the sternum. 
Jf, the trachea. 
g, the esophagus. 
A, the arteria innominata. 
i, the right vena innominata. : 
k, the left vena innominata, tranverse band uni- 
ting the two sides of the aponeurosis. 
I, the left carotid artery. 
m, the left subclavian artery. 
m, section of the muse. long. colli. 
fixed in front of the recti capitis anticito the 
inlet of the chest, where it adheres, beside the 
longus colli, to the neck of the first rib; it 
binds down the pre-vertebral muscles, is at- 
tached deeply to the tips of the transverse pro- 
cesses, and receives by its surface a septal slip 
from the cervical fascia just externally to the 
sheath of the vessels. An important process 1s 
