SKIN. 



95 



(5) Trace an artery arising from a subcutaneous trunk, and note that as it ascends it 

 gives off branches to the sweat-duct, hair-sac, sebaceous glands, and hair-muscle, and note its 

 termination in capillary loops in the papillse, from which a vein proceeds which opens into 

 relatively large veins lying in the superficial layers of the corium (Klein). (Indicate the 

 general arrangement of the blood-vessels in PI. XXI., Fig. i.) 



LYMPHATICS OF THE SKIN. 



They require to be injected by the puncture method (p. Iv), using a watery solution 

 of Berlin-blue. But the task is by no means an easy one. Injection of the skin of the palm 

 of the hand or sole of the foot yields the best results. 



NERVES OF THE SKIN. 



The nerves of the skin are very numerous, and the mode of termination of some of them in 

 Pacinian corpuscles in the subcutaneous tissue (p. 46), and in Wagner's tactile corpuscles in 

 some of the papillae of the corium (p. 92), has already been alluded to. These touch-cor- 

 puscles are most numerous in the lips, skin of the hand, foot, and glans penis. 



It requires some modification of the gold method preferably that with lime-juice and 

 formic acid (p. xlv) to obtain preparations of the various nerve-plexuses (sub-epithelial and 

 inter-epithelial) in the skin. 



The snout of the pig and the skin of the nose of the mole may be employed. 



The peculiar nerve-endings recently described by Ranvier and Merkel, may be found in 

 the snout of the pig, and especially in the soft part of a duck's bill. 



