2. The superior vena cava ([p. 316]). Find its branches. Trace the azygos as far back as the diaphragm without dissecting it at all.
Find the division of the innominate ([p. 318]) into subclavian and external jugular.
Trace next—
3. The external jugular ([p. 319]). Remove the skin from the side of the face and trace its branches ([Fig. 131]). The internal jugular, vena facialis profunda, the submentalis, and the deep terminal branches of the posterior facial cannot be followed at this time; veins shown on [Fig. 131] should all be found, however.
4. Trace the thyrocervical axis and its branches ([p. 293]). Add them to your diagram of the subclavian.
5. Follow the common carotid artery ([p. 283]) and internal jugular vein ([p. 320]). Find the division of the common carotid into its terminal branches and then dissect its lateral branches and those of the internal jugular (see [Fig. 119]).
6. The external carotid ([p. 285], and [Fig. 119]). Follow its branches with the exception of the internal maxillary.
7. The internal maxillary ([p. 287]). Find its inferior alveolar branch first and follow it by cutting away with bone-forceps the ventral border of the lower jaw. To follow its other branches and those of the carotid plexus, remove the zygomatic arch, cut the temporal, masseter, and pterygoid muscles, and cut the mandible behind the incisor teeth and remove it. The branches which pass into the skull are not to be followed at present. The posterior facial vein ([p. 323]), the vena facialis profunda ([p. 323]), and the submental vein ([p. 323]) may be followed at the same time.
8. The internal carotid ([p. 285]). Follow it to the point where it enters the cranium.
9. Trace the other branches of the costocervical axis ([p. 292]). To do this, cut the arteries and nerves of the axilla on the side on which they have been dissected, allowing the arm to fall backward. Then trace the branches of the costocervical axis with tracer, scalpel, and bone-forceps, taking care not to injure the vertebral artery. Add these branches to your diagram of the subclavian.