THE NOSE. 19 



Describe the Sweat-glands. Each gland consists of a single convoluted 

 tube, situated usually in the subcutaneous cellular tissue, and opening on the 

 surface of the integument by a spiral duct which pierces the derma and the 

 epidermis. It is formed of two coats, an external fibre -cellular, which is con- 

 tinuous with the corium, and an epithelial lining, continuous with the epidermis. 



State the probable number of Sweat-glands and their Evaporating 

 area. They are estimated as varying, in different parts of the integument, 

 from 417 to 2800 to the square inch, giving for the whole body a total of 

 nearly two millions and a half, representing an evaporating surface of about 8 

 square inches. 



ORGANS OF TASTE. 



What are the special Organs of Taste ? The Taste-buds, small, flask- 

 shaped bodies, each about ^\- inch long, situated in the fungiform and cir- 

 cumvallate papillae of the tongue. The seat of the sense of taste lies, how- 

 ever, in the mucous membrane covering the dorsum of the tongue, the upper 

 portion of the pharynx, the soft palate and the fauces. 



Name the special Nerves of Taste in the Tongue. The 

 Chorda Tympani Branch of the Facial, for its anterior two-thirds; perceiv- 

 ing saline, acid and styptic qualities (Flint). 



Lingual Branch of the Glosso-pharyngeal, for its posterior third; apprecia- 

 ting alkaline, metallic, sweet and bitter tastes (Flint). 



What is Sapolini's view of the Chorda Tympani Nerve ? From re- 

 peated dissections, Dr. Sapolini, of Milan, believes the chorda tympani to be a 

 separate cranial nerve, having its proximal end in the so-called intermediary 

 nerve of Wrisberg, originating in the floor of the 4th ventricle, and termina- 

 ting in a dense plexus with the lingual branch of the 5th nerve, in the mus- 

 cles of the tongue. He further concludes that the chorda tympani is the nerve 

 governing the movements of the tongue in speech, and that the nerves of taste 

 are the Lingual Branches of the 5th and Qth nerves. 



THE NOSE. 



[For an osteological description of the Nasal Fossae and Septum, see page 31.] 

 Where is the Organ of Smell situated ? In the mucous lining of the 

 upper portion of the nasal fossae, which is the seat of distribution of the ter- 

 minal filaments* of the Olfactory Nerve,d the special nerve of the sense of 

 smell. 



What is the Schneiderian Membrane ? The Schneiderian or Pituitary 

 Membrane is the mucous membrane of the nasal fossae. It is continuous with 



