Abstract
Based on evidence from comparative anatomy, embryology, and paleontology, it is well established that the middle ear of existing mammals is morphologically unique, the tympanic bone, malleus, incus, and tensor tympani muscle all being homologous with components of the feeding apparatus of other vertebrates (Fig. 28.1, see below for details). Extant mammals are also unique in having a very elongate cochlea, and sensitivity to a broader range of sound frequencies than other vertebrates, usually extending beyond 10,000 Hz. In addition, they are distinctive in generally having a protruding pinna (auricle) and a long, tubular external auditory meatus. The present chapter examines the extensive fossil evidence concerning the nature of the auditory machinery of early mammals and their antecedents. Both authors of the present account have written on this subject, arriving at different initial interpretations in certain regards (Hop-son 1966; Allin 1975).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
