Dissection under magnification 3.5 x of the PAA through a cervical approach. Injection of methylmethacrylate in the PAA as staining technique. Retroauricular approach to identify the territory of irrigation of PAA in the retroauricular skin and fascia. Measuring and location of stained area. Report of two cases of ear reconstruction with fasciocutaneous and fascia flaps based on PAA, designed according to anatomical study. In a sample of 10 cadaveric specimens the PAA irrigates an area of the skin and fascia retroauricular of 10,7 cm length x 7,07 cm wide equivalent to 60,44 cm² (95% CI 37,07-83,81), with a distribution posterior to external auditory canal of 7,15 cm(95% CI 5,53-8,77).In two patients treated with fascia and fasciocutaneous flaps based on the PAA these were good options for reconstruction. A fascia or fasciocutaneous flap from the retroauricular region based on PAA within the dimensions and location found in this study will be a safe option for reconstruction of the ear