PPT-The Evolution of the Human Ear

Will Cranford Complex Structure Other Auditory Systems Inner Ear Bones Incus Anvil Malleus Hammer Stapes Stirrup Traceable through fossil record Inner Ear Bones the discovery that the mammalian malleus and incus were actually homologues of visceral elements of the reptilian jaw articulation ranks as one of the milestones in the history of comparative . The Human Ear. Composed of outer, middle and inner ear. The Outer Ear. The visual part of the ear. Composed of pinna and auditory canal. The pinna acts as a funnel, collecting sound waves and directing them to the auditory canal. A mechanism for change in populations.. Any change in the . inherited . traits within a population across generations. Individuals better adapted to their environment tend to survive and . produce more offspring. Introduction – Human . Evolution. Mosaic Evolution: . ________________________. With respect to human evolution:. . _____________________. Developed at varying times along our evolutionary history . Mechanisms of concerted evolution. Unequal cross-over. Gene conversion: non-reciprocal transfer of information between homologous sequences; the main mechanism invoked to explain concerted evolution. Pinna. External Auditory Meatus (Ear Canal). Tympanic Membrane (Ear Drum). What are the ossicles?. The small bones of the ear.. Hammer (Malleus). Anvil (Incus). Stirrup (Stapes). Name the structures that make up the bony (osseous) labyrinth.. Follow-Me – . iQuiz. Q. What is the function of the semi-circular canals?. Air. Brings impulses from retina; Brings impulse to brain. Ear. Detect colour. Convert light into nerve impulses; Image forms on it. Anatomy. Inner ear consists of :. Bony Labyrinth: filled with a fluid called . perilymph, . consists of 3 parts:. The Vestibule. The Semicircular Canals: . 3 in number (Lateral, Posterior, Superior). Listeners . repeated target sentences presented in quiet from a loudspeaker at 0° azimuth. Responses were scored by an experimenter.. Peak pupil dilation during the post-stimulus wait period was used to evaluate listening effort (Figure 1. The ear is a sensitive organ of the human body. It is mainly concerned with detecting, transmitting and transducing sound. Maintaining a sense of balance is another important function performed by the human ear.. RVEEH 2014 . Ref No: PIL 017 Version 2 Ear Wax and Ear Care Advice Patient Information Leaflet RVEEH , Ear Wax and Ear Care Advice, 2014 . Ref No: P Otitis. . externa. -Inflammation . of . epithelium of the vertical . or horizontal ear canal or . both and surrounding structure. Otitis. media . -Inflammation . of tympanic cavity &membrane. Otitis. Objectives. Know the anatomical divisions of the ear and its main function . Learn the main features of the external ear including features of the auricle with its innervation and blood supply. . Know structure, innervation, blood supply and function of external acoustic canal and tympanic membrane. external ear,. the . middle ear,. or tympanic cavity, and the . internal ear,. or labyrinth, the last containing the organs of hearing and balance.. EXTERNAL EAR. Dr.Vohra. 4. The external ear has an . acoustic . transforms?. Kenneth Shane Moodie . H.BSc. . B.Ed. . M.Cl.Sc. .. Minnesota Academy Of Audiology Conference February 2018. shanemoodie77@gmail.com. Hearing Instrument Fitting - Process Overview.