Its structure contains the cclea, that constitutes the previous labyrinth. The cclea has 21/2 returns, and is represented as a cone of 35 mm of length. (figure 2). She is separate in two main compartments, the slope initial (on) and the timpnica slope (under) for the fundamental membrane. The superior gallery of the cclea, or slope initial, is communicated with the average ear through the oval window. The average gallery or canal to coclear contains the agency of Corti.

The inferior gallery or timpnica slope, if communicates with average ear through the round window. The pulse if propagates quickly, but during the passage, it establishes gradients of pressure between the superior slope and the inferior. This gradient of pressure compresses the agency of Corti, that generates an electric impulse. An important biofsico factor in this process according to HENEINE (2005, P. 330), is the potential difference enters the agency of Corti (+ 80 mv) and endolinfa (- 70 mv), what it becomes the sensible and excitable cells extremely (figure 3).

Figure 2. Uncurled Cclea, lateral vision Source: HENEINE, 2005, P. 331 Figure 3. Uncurled Cclea, transversal section Source: HENEINE, 2005, p.331. TRANSMISSION AND RECEPTION OF the SONOROUS WAVES FOR EAR In accordance with DURN (2005, p.229) ' ' the sonorous stimulaton is carried foot it system spandrel-ossicular penetrating in perilinfa from the slope initial.? It affirms despite ' ' in consequence of this, in this region of the internal ear, he will go to occur a simultaneous displacement of the membranes of Fundamental Reissner and of the canal to coclear. The receiving cells and of sustentation in common have the fundamental membrane in all its extension, therefore when it has an oscillation in the base of this membrane, the stimulaton if propagates as a travelling wave FIGURE 10.18. These travelling waves will arrive at the brain through the internal ciliadas cells that make sinapses with neurons.