72 



THE PROTECTIVE STRUCTURES OF THE FOOT. 



Moller distinguishes in the sensitive wall three layers, viz., 

 (1) the periosteal layer (stratiim-periostale) ; (2) the vascular 

 layer (stratum-vasculosum) ; and (3) the real laminal layer 

 (stratum-phyllodes), corresponding to the corium of other 

 parts of the body. Moller estimates that at the junction of 

 the upper and middle thirds of the toe primary laminae are 

 from 24 to J Jo inch, and the secondary laminse from q^q to 

 3J0 of an inch in thickness. At the lower end of the wall 

 the primary laminae are about 4}^ inch, the secondary about 

 12^00 to 480 inch. At the centre of the toe, in many cases, 

 a small depression may be found, which extends on to the 

 wall, and contains papillae corresponding in position with the 

 little rounded prominence to be found at the toe of the horny 

 capsule. 



4. The Sensitive Sole. 

 (Fig. 43, b.) 



The corium, after clothing the wall, is reflected over the lower 

 border of the pedal bone to the sole, and then loses its laminal 



character, except at the bars, ex- 

 hibiting instead papillae which 

 partly resemble those of the perio- 

 plic ring, partly those of the coro- 

 nary band. The portion of the 

 under surface of the foot covered 

 by long, thick papillae, like those 

 of the coronet, is termed the 

 sensitive sole (fig. 43, h). This, 

 often flecked with black colourint^ 

 material, or irregularly tinted, 

 includes the entire anterior third 

 of the under surface, and is divided 



Fig. 43. — Lower surface of foot denuded 

 of horny capsule, a, sensitive bars ; b, intO tWO partS by the SCnsitivC 

 sensitive sole ; c, sensitive frog ; rf, fur- . 



row of the frog- into which the " frog- fro"', betwccu which and the scnsi- 



stay ' fits ; e, bulbar expansion of perio- . 



plic ring, which is seen to be continu- tivC SOlc, hoWOVCr, intervene the 



ous with the sensitive frog. 



bars. The sensitive sole is con- 

 nected, as already remarked, with the coronary band by a 

 number of rows of large papillae insinuated between the 

 " laminal " portion of the bars (secreted by a continuation of 

 the sensitive laminae) and the sensitive frog. The sensitive 



