Handbook of meat inspection . iiear the ster-num, small and few in number, foUow-iug the course of the internal thoracicveins (Fig. 21,/). Afferent vessels fromthe rectus abdominis, the anterior sur-face of the diaphragm, and from theintercostal muscles.* The afferent ves-sels pass in part to the anterior media-stiual glands, in part directly into thethoracic duct and the right lymphatictrunk. 3. Anterior mediasfinal glands (, h).—These lie between the folds ofthe anterior mediastinal receive lymph from the lieart,pericardium and diaphragm. Efferentvessels into the thoracic
Handbook of meat inspection . iiear the ster-num, small and few in number, foUow-iug the course of the internal thoracicveins (Fig. 21,/). Afferent vessels fromthe rectus abdominis, the anterior sur-face of the diaphragm, and from theintercostal muscles.* The afferent ves-sels pass in part to the anterior media-stiual glands, in part directly into thethoracic duct and the right lymphatictrunk. 3. Anterior mediasfinal glands (, h).—These lie between the folds ofthe anterior mediastinal receive lymph from the lieart,pericardium and diaphragm. Efferentvessels into the thoracic duct and right-lymphatic trunk. 4. Posterior mediastinal glands (, h).—Lying uuder the aorfcic lympli vessels from the peri-cardium, the mediastinal membrane, esophagus, pleura, diaphragm, the anterior abdominal region, andfrom the anterior surface of the liver. Efferent vessels empty inpart into the bronchial glands, in part into the anterior mediastinalglands, in part directly into the thoracic i::~^a Calf sling. a and a, bronchial planus ; h,anterior and posterior media-stinal glands; c, portal glands. * The intercostal muscles can not be infected by translocation of tuberculouslymph from the pleura. Furthermore, the lymph vessels take their origin in theintercostal muscles, and pass thence toward the pleura or mediastinal Spaces. NORMAL APPEARANCE 183 5. Bronchial (jhnvl^ (Figs. 22, a,a).—Lyiug ou botli siiles of tbetracbea, at its poiut of bifurcation, are coveretl by tlie aorta, and, infat auimals, also by fat tiasue. They may be exposed by a deepincisiou from above and outward to tlie point of bifurcation. Affer-ent vessels from tlie luugs and posterior mediastinal glands. Effer-ent vessels to the anterior mediastinal glands and thoracic duct. (b) abdominal and pelvic cavities. 1. Lumhar glands (Fig. 21, d).—These lie near the lumbar ver-tebrae, in part covered by the lumbar muscles. Two groups of them, Fig. 23.
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