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Tributaries.—The right lymphatic duct receives the lymph from the right side of the head and neck through the right jugular trunk; from the right upper extremity through the right subclavian trunk; from the right side of the thorax, right lung, right side of the heart, and part of the convex surface of the liver, through the right bronchomediastinal trunk. These three collecting trunks frequently open separately in the angle of union of the two veins.

FIG. 600– Modes of origin of thoracic duct. (Poirier and Charpy.) a. Thoracic duct. a’. Cisterna chyli. b, c’ Efferent trunks from lateral aortic glands. d. An efferent vessel which pierces the left crus of the diaphragm. e. f. Lateral aortic glands. h. Retroaortic glands. i. Intestinal trunk. j. Descending branch from intercostal lymphatics. (See enlarged image)

FIG. 601– Terminal collecting trunks of right side. a. Jugular trunk. b. Subclavian trunk. c. Bronchomediastinal trunk. d. Right lymphatic trunk. e. Gland of internal mammary chain. f. Gland of deep cervical chain. (Poirier and Charpy.) (See enlarged image)

3. The Lymphatics of the Head, Face, and Neck

The Lymph Glands of the Head (Fig. 602).

The lymph glands of the head are arranged in the following groups:

Occipital.		Facial.
Posterior Auricular.		Deep Facial.
Anterior Auricular.		Lingual.
Parotid.		Retropharyngeal.

The occipital glands (lymphoglandulæ occipitales), one to three in nu ber, are placed on the back of the head close to the margin of the Trapezius and resting on the insertion of the Semispinalis capitis. Their afferent vessels drain the occipital region of the scalp, while their efferents pass to the superior deep cervical glands.

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