498 ANATOMY IN A NUTSHELL. 



These trabecule arc broad at the attachment of the capsule but small in the 

 central portion. The outer portion of the node is called cortex and the inner 

 portion is called medulla. These trabeculse form numerous divisions in the 

 node, and these divisions are partly filled with pulp The space between the 

 pulp and the division wall is called the lymph sinus and is crossed by a net- 

 work of adenoid reticular tissue. This pulp is a mass of leucocytes. The 

 hilum is a notch where the arteries enter and the veins and efferent vessels Leave 

 the node. These nodes make white blood corpuscles. 



There are aboul seven hundred lymphatic nodes in the body andtheyare 

 all situated beneath the deep fascia except the superficial inguinal nodes. 



LESSON CLXIV. 



The superficial lymphatic vessels of the upper extremity pass from the tips 

 of the fingers towards the shoulder with the superficial veins. Those on the 

 inner side of the arm run with the ulnar veins towards the elbow then with the 

 basilic vein to the axillary glands and deep vessels. Those on the outer side of 

 the arm run with the radial veins to the elbow, and at this point some join the 

 basilic group, while others run with the cephalic vein to the axillary nodes. 

 A few i^ this last set pass between the Deltoid muscle and the Pectoralis major 

 to the subclavian nodes. 



The deep lymphatic vessels of the upper extremity pass with the deep blood 

 vessels. They accompany the following arteries in the forearm: (t) radial, 



(2) ULNAK. (3) ANTERIOR INTEROSSEOUS, (4) POSTERIOR INTEROSSEOUS. They 



communicate with the superficial lymphatic vessels at intervals. They ac- 

 company the brachial artery from the elbow and pass through the axillary and 

 subclavian nodes to the thoracic duct on the left side, while those on the right 

 side pass to the right lymphatic duct. 



The superficial lymphatic nodes of the upper extremity are not numerous. 

 In the cubital fossa there are two or three and above the internal condyle near 

 the basilic vein there is one or two. 



The deep lymphatic nodes of the upper exremity are found along the radial 

 and ulnar vessels. A few small ones are found along the inner side of the 

 brachial artery, and one or two just above the inner condyle. There arc ten 

 ortwelve around the axillary vessels which drain the front of the chest and the 

 skin of the back. The subclavian nodes are two or three which are connected 

 with the axillary nodes and deep cervical nodes. They lie under the clavicle. 



The superficial lymphatic vessels of the lower extremity lie in the supei- 

 ficial fascia. They are divided into two groups, (1) a large internal group 

 which follows the internal saphenous vein to the vertical set of the superficial 

 inguinal nodes. From these superficial inguinal nodes some efferent vessels 

 pass through the cribriform fascia and femoral sheath to a node in the femoral 

 canal by which it communicates with the vessels of the trunk, and others pass 

 through the fascia lata to the deep inguinal nodes. (2) An external group, 

 which is smaller and is situated on the outer side of the foot, sends one set of 

 vessels across the tibia just below the knee to join the internal group, while the 



