864 THE VASCULAR SYSTEM. 
(1) The intracranial lymphatics are («) the cerebral and (0) the meningeal. 
(a) The cerebral lymphatic vessels commence in the substance of the brain as 
perivascular spaces round the branches of the cerebral arteries; they accompany 
the cerebral branches of the internal carotid and the vertebral arteries, and, leaving 
the skull with the main arterial trunks and the internal jugular vein, terminate in 
the upper deep cervical 
glands. 
(>) The meningeal 
lymphatic vessels com- 
mence in the substance 
of the dura materg 
they accompany the 
meningeal — blood- 
vessels, and they ter- 
minate in the internal 
maxillary glands and 
in the upper deep 
cervical glands. 
(2) The extra- 
cranial lymphatics 
are either (a) super- 
ficial or (5) deep, and 
the two sets anasto- 
mose freely together. 
(a) The superficial 
lymphatic vessels com- 
mence in the sub- 
cutaneous tissues and 
in the superficial 
muscles of the face and 
scalp. 
(b) The deep lym- 
phatic vessels originate 
in the walls of the 
nose and mouth, im 
the tongue, in the 
walls of the pharynx, 
: the cesophagus, the 
4 larynx and trachea, in 
Fic. 593.—LyMPHATIC VESSELS AND GLANDS OF THE HEAD AND NECK, the : contents of the 
The deep lymphatics are coloured red, the superficial black. In each set orbital and other 
the afferent vessels are shown in continuous lines ; the efferent and inter- extracranial fossee, and 
glandular vessels are represented by dotted lines. in the muscles, bones, 
B. — Buecal glands. en Superficial parotid glands. ; ye ‘ : 5 
D.C. Deep cervical elands. Ss. Sapnistiias glands. and ligaments of the 
I.L. Infra-laryngeal glands. 8.C. Superficial cervical glands. neck. 
M. Mastoid glands. S.M. Submental glands. All the extracranial 
O. Occipital glands. T. Tracheal glands. 
lymphatic vessels, both 
superficial and deep, 
are afferents to some of the glands of the head or neck, and their general cdistribu- 
tion and terminations are mentioned in connexion with the glands with which 
they are associated. 
The lymphatic glands of the head include the following :— 
The occipital glands (lymphoglandule occipitales), two or three in number, 
are embedded in the superficial fascia over the upper part of the trapezius 
muscle. They receive afferent vessels from the occipital region of the scalp and 
from the superficial parts of the upper and back portion of the neck, and their 
efferents terminate in the superficial cervical glands. 
The mastoid glands (lymphoglandule auriculares posteriores) le im the super- 
ficial fascia on the upper part of the sterno-mastoid muscle and on the mastoid 
Z. Zygomatic glands. 
