The outer ear consists of the pinna and the ear canal. Consequently, the concave pinna fills with disorganized connective tissue. Microtia is a congenital deformity where the pinna (external ear) is underdeveloped. This defect of the earlobe causes the prominence of the lower third of the pinna. The cartilage is the continuation of the cartilage framework of pinna. An in-ear wearable stereo microphone used like earphones, placed inside the human pinna. The Auricle (anatomy), also known as the pinna is a rabbit's outer ear. Earmuff style hearing protection devices are designed to fit over the outer ear, or pinna. Another mutation of the ear pinna was found in Scottish Fold cats. The soft cushions seal around the pinna of the ears. As with other true seals, there is no pinna (ear flap). Anomalies and malformations of the pinna are common. Essentially, such approach uses both interaural difference principle and pinna filtering effect theory. BTE hearing aids consist of a case which hangs behind the pinna. The manager was Gustavo Giagnoni who called Gianfranco Pinna and Giuseppe Nioi as keepers.