THE TISSUES. 



tached to an arterial twig, and either rest upon it laterally, or are 

 situated at its angle of division, or transfixed by the artery itself. 

 (Fig. 412.) Arteries of g ^ to ^ of an inch have 5 to 10 corpus- 

 cles; and each cubic line appears, on an average, to contain one of 

 them (Ktilliker), they constituting J to J of the whole pulp. (Gray.) 

 Gray describes the Malpighian bodies as consisting of 1st, a 

 closed capsule intimately connected with the sheath of the vessel, 



formed of simple membrane, and 

 Fi s- 413 - TS i to g Aj of an inch thick 



(Kblliker) (Fig. 413); and, 2c%, its 

 contents, a viscid grayish substance, 

 consisting of 1st, an amorphous, 

 finely granular matter, containing 

 dispersed nuclei; 2dly, nuclei like 

 those of the red pulp, 52 V<r to 3 oVo 

 of an inch in diameter; and, Sdly, 

 a few nucleated cells, 5 ^^- of an 

 inch in diameter. No- blood-cor- 



A Malpighian corpuscle from the spleen of p USC leS, Cither free Or in Cells, 

 au ox. a. Wall of the corpuscle, b. Con- . ' . 



tents, d sheath of the artery, e. Waii of are fcere met with. Remak and 



the artery.-Magnified 150 diameters. (Ki'Uir Leidy, hoWCVCr, haVC not found the 



distinct capsule above described ; 



but assert that the Malpighian corpuscles pass, in man at least, into 

 the red pulp. The external surface of the closed capsule is covered 

 by a plexus of capillaries. (Gray.) Kolliker's idea, of a clear fluid 

 within the capsule, is contradicted by most recent observers. 



Vessels. The subdivisions of the splenic artery are .very nume 

 rous, and assume the peculiar arrangement shown in Fig. 412 ; and 

 finally merge into capillaries 4^^ to 3? Vir f an ^ ncn m diameter, 

 constituting a network throughout the pulp and around the Malpi- 

 ghian corpuscles (Fig. 414), and traversing the substance of the latter 

 also. (Drs. Sanders and Huxley?) The veins present no peculiarity 

 requiring mention here. The lymphatics are, comparatively, very 

 few ; and the lymph of the deep-seated ones contains blood-cor- 

 puscles, perhaps from rupture of minute bloodvessels (p. 148). In 

 diseased spleens, no trace of the superficial lymphatics (those be- 

 tween its two coats) can usually be detected. The nerves, consisting 

 of many fine and a few* thick fibres, are derived from the splenic 

 plexus, and accompany the -branches of the artery into the interior 

 of the organ. 



