The =thoracic duct= often divides near its termination into two branches
which unite to form an ampulla. The latter suddenly contracts and opens
into the terminal part of the left jugular vein.
The =submaxillary lymph glands= are situated in the space between the
omo-hyoid and internal pterygoid muscles in relation to the lower part
of the anterior border of the submaxillary salivary gland. There are
commonly two on each side, one large, the other small.
The =parotid lymph glands= (Fig. 309) are reddish-brown in color. There
are usually four of considerable size on either side. One is situated at
the upper part of the posterior border of the masseter, partly covered
by the parotid gland. Another large subparotid gland lies below the base
of the ear. Ventral to this are two smaller glands, one above and one
below the external jugular vein.
The =pharyngeal= (or retropharyngeal) =lymph glands= (Fig. 310) are
situated on the dorsal wall of the pharynx above the external carotid
artery and below and behind the paramastoid process. There are usually
two of considerable size on either side.
The =middle cervical lymph glands= form a group on the
mastoido-humeralis on the course of the external jugular vein.
The =prescapular lymph glands= are situated at the anterior border of
the anterior deep pectoral muscle undercover of the trapezius and
omo-transversarius.
The =prepectoral lymph glands= are reddish in color and usually three in
number. The largest is placed centrally under the trachea; the others
are situated on the brachial vessels as they turn around the first rib.
The =axillary lymph glands= are usually absent, but very small nodes may
be found near the insertion of the latissimus dorsi. Cubital glands are
not present.
[Illustration: