22-23 Ch 7 Auditory Perception

• Temporal Lobe

  • Area of the brain that corresponds to the frequencies detected by the cochlea

Vestibular Apparatus

• Semicircular canals

  • rotational movement

• Saccule and Utricle

  • static and linear motion

• Ampulla - opening of semicircular canals filled with endolymph

  • Crista ampullaris – receptors in the semicircular canals

    • Tuft of hair cells

    • Cupula (gelatinous cap) covers the hair cells

• Saccule and Utricle

  • macula

    • hair cells

    • otolithic membrane

      • gelatinous matrix

    • otoliths

      • protein-calcium granules

• • Sensorineural hearing loss

    • damage to organ of Corti

      • presbycusis - age related

      • Noise-induced hearing loss

      • infections

      • head trauma

      • tumors

• Conductive Hearing Loss

  • sound waves are not reaching the organ of Corti

• Mixed

  • a mixture of both sensorineural and conductive hearing loss

• ​Tinnitus

  • ringing in the ears

    • subjective

      • abnormal nerve activity

    • Objective

      • physiological middle ear muscle spasm

• ​Vertigo

  • ​sensation of spinning or tilting

    • dizziness, mental bewilderment, confusion, nausea

  • Traumatic brain injury

  • Ménière’s Disease

    • too much endolymph is produced