2-iS ELEMENTARY PHYSIOLOGY. [XXIV. 



e. In the lower part of the derails bundles of 

 nerves which, as they run to the upper part 

 of the dermis, split up into smaller bundles 

 and form a plexus ; from this run still smaller 

 bundles to form a more superficial closer 

 meshed plexus ; probably the latter will not 

 be very obvious in this specimen. 



/. Hair-follicles and the roots of hairs. Note 



a. The outer sheath of the follicle formed 

 of fibrous tissue continuous with that 

 of the dermis, but much denser in 

 arrangement. 



(3. The inner sheath of the follicle, con- 

 sisting for the most part of indistinct 

 transversely arranged fibres, amongst 

 which oblong nuclei may be discerned. 



7. A hyaline limiting membrane more 

 marked than that of the dermis. 



. The outer root-sheath, consisting of cells 

 continuous with, and resembling those 

 of the Malpighian layer. 



e. The inner root-sheath, pale and trans- 

 parent, its inner part consists of small 

 nucleated cells, near the bulb its cells 

 become larger. This sheath is absent 

 above the duct of the sebaceous gland. 

 At the exit of the hair from the skin 

 the horny layer dips down around it in 

 the form of a cone. 



