Embryonic development and functional sound-transmitting system of the acoustic analyzer peripheral part in the willon grouse, Lagopus lagopoua

摘要

Specific features of growth and functional readiness of the sound-transmitting system of the external and middle ears in nidifugous birds were studied using the willon grouse, Lagopus lagopus (L. 1758). The morphometric characteristics of the middle ear columellar complex in willon grouse embryos in the second half of the incubation period are presented. Time intervals of growth and differentiation of the tympanic membrane, columella auri, muscle of the columella, and other components of the sound-transmitting system in the peripheral part of the auditory analyzer were determined. The terms of functional involvement of external and middle ears in transmission of acoustic information from the environment to cochlea receptors are substantiated.