Sobre l’o\u00efda<\/span><\/h3>\n[\/vc_column_text][vc_separator type=”small” position=”left”][vc_column_text]Ens comuniquem amb el m\u00f3n exterior gr\u00e0cies als nostres cinc sentits: vista, o\u00efda, olfacte, gust i tacte. D’ells el m\u00e9s meravell\u00f3s, complex i sofisticat \u00e9s el sentit de l’o\u00efda. Auditivament podem analitzar la intensitat, freq\u00fc\u00e8ncia i durada de l’est\u00edmul sonor. Ens permet detectar un senyal provinent de qualsevol punt de l’espai i determinar la seva posici\u00f3, mitjan\u00e7ant difer\u00e8ncies d’intensitat i temps d’una o\u00efda respecte a l’altre. (Recordem que la vista nom\u00e9s ens permet detectar senyals frontals i semi-laterals).<\/p>\n
El so es transmet a trav\u00e9s de l’pavell\u00f3 i conducte auditiu (orella externa) fins a la membrana timp\u00e0nica i la seva vibraci\u00f3 es comunica al (orella mitjana) a la cadena ossicular (martell, enclusa i estrep) ia continuaci\u00f3 a trav\u00e9s de la finestra oval, a la c\u00f2clea (o\u00efda interna). Hi ha una finestra de descompressi\u00f3, la finestra rodona. A la c\u00f2clea hi ha dos l\u00edquids de diferents caracter\u00edstiques f\u00edsiques (endolimfa i perilimfa) i en la membrana basilar dins de la c\u00f2clea s’ubiquen unes 15.000 c\u00e8l\u00b7lules ciliades externes i internes gr\u00e0cies a les quals es realitza una an\u00e0lisi de freq\u00fc\u00e8ncia (teoria tonot\u00f3pica) i una transmutaci\u00f3 de l’energia vibrat\u00f2ria en senyal el\u00e8ctrica que a trav\u00e9s del nervi ac\u00fastic (parell VIII) es transmet a el cervell, on \u00e9s percebuda el senyal[\/vc_column_text][vc_separator type=”transparent” up=”40″ down=”0″][\/vc_column][vc_column width=”1\/2″][vc_separator type=”transparent” up=”5″ down=”0″][vc_single_image image=”16327″ img_size=”full” qode_css_animation=””][vc_separator type=”transparent” up=”25″ down=”0″][vc_column_text]Gr\u00e0cies a l’o\u00efda elaborem la nostra qualitat de veu, percebem la parla d’altres persones i en definitiva ens comuniquem verbalment amb elles.<\/p>\n
La complexitat de la fisiologia auditiva \u00e9s tal que no coneixem perfectament el seu funcionament. Si b\u00e9 la fisiologia de l’o\u00efda externa i mitjana la coneixem b\u00e9, hi ha aspectes no coneguts sobre el funcionament de l’o\u00efda interna que permet a una o\u00efda sa, sentir b\u00e9 en ambients sorollosos i discriminar entre diversos sons simultanis.[\/vc_column_text][vc_separator type=”transparent” up=”25″ down=”0″][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"
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