Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to pinna: auditory canal


1. any leaflet of a pinnate compound leaf
2. Zoology a feather, wing, fin, or similarly shaped part
3. another name for auricle



(also auricle or auricula), the external part of the human and mammalian auditory analyser, consisting of elastic cartilage and a skin covering. The cartilage determines the pinna’s shape and its various elevations and depressions, such as the helix (the pinna’s incurved margin), the antihelix (located parallel to the helix), the tragus (the anterior protuberance), the antitragus (located behind the tragus), and the fossa triangularis. The lobe has no cartilage. Deep within the pinna, directly behind the tragus, is the opening of the external auditory canal. The pinna’s skin is covered with minute hairs and contains sebaceous and sudoriferous glands.

In some mammals, the pinna is endowed with special musculature and is capable of movement; in others, individual parts of the pinna are capable of movement; and in still others, for example, humans, movement is severely limited. The pinna is secondarily simplified or completely reduced in many aquatic mammals, such as whales, manatees, seals, and walruses, and in many burrowing animals, such as desmans and moles. It is well developed in nocturnal animals, for example, bats, in some forest ungulates, and in desert canids.

The pinna has many functions. It receives sound and amplifies or reflects it according to frequency. It makes possible the determination of the spatial location of a sound source. It also protects the auditory organs from mechanical injury during digging and diving, as well as from excessive noise, by means of special protective hairs, by the overlapping of the auditory canal, or by the involution of the entire pinna, as in some bats.



The cartilaginous, projecting flap of the external ear of vertebrates. Also known as auricle.
References in periodicals archive ?
Uuringu kaigus tehtud ANOVA ja graafilise analuusi tulemusena on toestatud, et otsfreesi liikumissuunal ning kaldenurgal on toodeldud pinna pinnakareduse parameetrite formeerimisele oluline moju.
The fan mussel Pinna nobitis (Linnaeus, 1758) is one of the largest bivalve molluscs in the world.
Frondes hasta de 2,5 m; peciolos con escamas de la base lineares, escasamente denticuladas, de color castano claro, retorcidas, formando una densa masa lanosa; laminas de 1 m, 4-pinnado-pinnatifidas en la base, 2-pinado-pinnatifidas en el medio; pinnas basales 30-50 cm, fuertemente inequilaterales, peciolulos hasta de 2,5 cm de largo, pinnulas acroscopicas levemente reducidas hacia la base de la pinna; raquis abaxialmente pubescentes, pelos 0,8-1,2 mm, 4 o 5 celular, densamente glandular, glandulas ca.
80 patients presented with pseudocyst of the pinna to the Department of Ear, Nose and Throat of Institute of Medical Sciences and SUM Hospital, Bhubaneswar, Odisha, between March 2008 and December 2015 (Fig.
Pre-operative management performed with aseptical preparation of affected ear pinna by clipping and shaving of hair on both sides (convex and concave surface) after moisturizing the region with antiseptic soap.
A vesicular rash developed at the right earcanal and pinna suggest that herpes virus is the possible pathogenesis for this patient.
Station Habitats Seafloor Soil substrate (n = 3 per species) (n = 3 per species) 1 Strombus urceus Tapes dorsatus Tectus fenestratus Periglypta lacerata Anadara antiquata 2 Tectus fenestratus Trachycardium alternatum Tapes dorsatus Placuna ephippium Strombus turturella 3 Telescopium telescopium Polymesoda bengalensis Lingula unguis Katelysia japonica Station Habitats Sea grass Coralline area (n = 3 per species) (n = 3 per species) 1 Atrina vexillum Spondylus squamosus Pinna bicolor Pinna muricata 2 Pinna bicolor Spondylus albibarbatus Atrina vexillum Spondylus squamosus 3 Table 3: Shellfish toxicities at Murcielagos Bay, Philippines.
Two of them went to a shop owned by local trader identified as Ramazan Butt alias Pinna Butt and opened indiscriminate fire killing his son Hafiz Sajjad and salesman Muhammad Tayyeb.
WITH hefty bans over the last two winters - first for Richard Hughes and then even more controversially this year for Martin Dwyer - India might have burned some bridges with international jockeys, but Hong Kong is still luring them, with Colm O'Donoghue, Karis Teetan and Nicola Pinna signing six-month contracts to ride there, with the season kicking off today.
The scientists fashioned the collagen connective tissue from a cow into the shape of a human pinna - the fleshy visible part of the ear - and held it in place by titanium wire.
With: Huang Yu-siang, Sandrine Pinna, Lee Lieh, Hsieh Kan-chun, Lin Yu-chih, Wu Ya-jo, Sheu Fang-yi, Huang Ayugo, Yin Shin.