Hearing and Balance

Colleen Curley
Mind Map by Colleen Curley, updated more than 1 year ago
Colleen Curley
Created by Colleen Curley over 4 years ago


Bachelors Human Structure and Function (Principles) Mind Map on Hearing and Balance, created by Colleen Curley on 12/08/2015.

Resource summary

Hearing and Balance
1 External ear (hearing)
1.1 Auricle
1.1.1 Fleshy part
1.1.2 Elastic cartilage covered in skin
1.1.3 Shape directs soundwave to external auditory canal
1.2 External auditory canal
1.2.1 Lined with hairs
1.2.2 Ceruminous glands Cerumen - modified sebum (earwax)
1.2.3 Hairs + cerumen prevent foreign bodies reaching tympanic membrane
1.3 Tympanic membrane
1.3.1 Thin, semitransparent and nearly oval shape
1.3.2 Seprates external and middle ear
1.3.3 3 layers Simple cubodial epithelium (inner surface) Thin stratified columnar epithelium (outer surface) Connective tissue (middle)
1.3.4 Soundwaves cause it to vibrate
1.3.5 Rupture lead to hearing impairment
2 Inner ear (hearing and balance)
2.1 Sensory
2.2 Interconnecting, fluid-filled tunnels and chambers (within the petrous portion of temporal bone)
2.3 Bony labyrinth within the temporal bone
2.3.1 Lined with endosteum Inner surface endosteum lined with perilymphatic cells
2.3.2 Membranous labyrinth Outer surface of membranous labyrinth lined with perilymphatic cells Filled with fluid - endolmyph High [K+] and low [Na+] opposite of perilymph concentrations
2.3.3 Space between bony and membranous labryinth filled with perilymph
2.3.4 3 regions Cochlea 3 parts of membranous labyrinth Scala Vestibuli Extends from oval window to helicotrema, back from apex, parallel to scala vestibuli to membrane of round window Scala Tympani Cochlear duct Vestibule Balance Semicircular canals Balance
3 Middle ear (hearing)
3.1 Air-filled space (within the petrous portion of the temporal bone)
3.1.1 3 Auditory ossicles Malleus Vibration of tympanic membrane causes malleus to vibrate because malleus handle attachted to inner surface of tymoanic membrane Malleus head attached by very small synovial joint to incus Incus Incus synovial joint with malleus and synovial joint with stapes Stapes Foot plate fits into oval window and held by flexible annular ligament Transmit vibrations from tympanic membrane to oval window 2 small skeletal muscles insert into auditory ossicles Tensor Tympani attached to malleus and innervated by trigeminal nerve (V) Stapedius muscle attached to stapes and innervated by facial nerve (VII)
3.2 4 openings
3.2.1 2 covered openings Round and oval on Medial side Seperate from inner ear
3.2.2 2 additional openings Opens into mastoid air cells Auditory tube (pharyngotympanic tube) opens into pharynx Equalizes air pressure of outside air and middle ear cavity Unequal pressure can distort tympanic plate, dampens its vibrations, associated pain fibres stimulated
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