Source: https://www.uspceu.com/Portals/0/docs/oferta-academica/grados/grado-en-optica-optometria-y-audiologia/plan-2009/guias-docentes/2/GD-5-16820-Anatomia-y-fisiologia-del-SV-y-SA-PRES.pdf?ver=2021-04-12-070827-447