Definition of concha in English:



Anatomy Zoology
  • 1A part resembling a spiral shell, in particular:

    • ‘On either side of the crest are air sinuses, the sphenoid sinuses, which are partially roofed over by the sphenoid conchae.’
    • ‘The featured surface includes anatomically correct projections resembling the concha, tragus, antitragus and other features of the external surface of the animal ear.’
    • ‘A placebo point in the inferior concha and the active stomach point on the concha ridge (both innervated by vagus nerve) were isolated with the Agiscop DT.’
    • ‘The ethmoid may exhibit two to four conchae (not including the inferior or maxilloturbinate).’
    • ‘The auricle, the visible portion of the outer ear, collects sound waves and, with the concha, the cavity at the entrance to the external auditory canal, helps to funnel sound into the canal.’
    1. 1.1 The depression in the external ear leading to its central opening.
      • ‘They are inserted into the lower part of the cranial surface of the concha.’
      • ‘The skin of the cartilaginous canal is affected initially, with more severe disease affecting the concha, bony canal and tympanic membrane.’
      • ‘The points are found, explains Sara, by imagining a baby in an inverted foetal position, with the earlobe representing the head, the concha the internal organs and so on.’
      • ‘In the majority of cases there is a combination of too much cartilage in the central bowl shaped portion of the ear called the concha, and a failure of the natural folds to develop in the portion of the ear known as the antihelix.’
      • ‘The convolutions of the external ear, particularly the concha, act to increase or decrease the amplitude of different frequency components of a sound as it passes from the free field to the eardrum.’
    2. 1.2 Any of several thin, scroll-like (turbinate) bones in the sides of the nasal cavity.
      • ‘Each inferior nasal concha is considered a facial pair of bones since they arise from the maxillae bones and projects horizontally into the nasal cavity.’
      • ‘An increase in the number of nasal conchae is common.’
      • ‘What Wittmer does find is a very close and convincing homology between the conchae (turbinals, cristae, etc.) marked in red in the figures adapted from his review.’
      • ‘He also had a large air cell (i.e., concha bullosa) within the left middle turbinate, which likely contributed to obstruction of ostia draining adjacent sinuses.’
      • ‘From the roof, the olfactory epithelium extends down both sides of the nasal cavity to cover most of the superior concha laterally and 1 cm of nasal septum medially.’


Late 16th century: from Latin (see conch).