Question

Making Connections: The Structure of the Ear Connections to Things I Have Already Learned Description (Structure and/or Function) Ear Structure Is largely composed of elastic cartilage, elastic fibers give it flexibility Aunicle (pinna) Component of external ear, located within the temporal bone, is a passageway for sound waves External audtory canal Tympanic membrane Auditory ossicles Three smallest bones in the body malleus (hammer), incus (anvil), stapes (stirrup), names are based on the shapes of the bones Oval window Pharyngotympanic tube Old names Eustachian tube, auditory tube Bony labyrinth Outer, bony part of the inner ear, is filled with perilymph Membranous labyrinth Cochlea Snail-shaped structure that contains the receptor organ for hearing--the spiral organ Vestibule Semicircular canals Vestibulocochlear nerve CN VIII; passes through the internal acoustic meatus (passageway) of the temporal bone on its way to the thalamus Round window

Answer 1

Answer) i) Auricle- Description (D)- Visible part of the ear, also known as pinnacle.

ii) External auditory canal- Connection (C)- Outside one-third portion of the canal is made up of cartilage and rest is made up of bones.

iii) Tympanic Membrane- D- This is a membrane at the end of external auditory canal which transmit sound signals from outside to auditory ossicles.

C- It consists of three layer: outside skin layer, middle layer made up of radial and circular fibre, and outside mucous layer. This membrane has blood vessels and sensory nerves attached to it which makes it sensitive to pain.

iv) Auditory ossicles- D- Tympanic membrane leads to the tympanic cavity where the auditory ossicles is present. It is made up of three bones, named as, malleus (outside), incus (middle), and stapes (inside).