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Ear (Cranial nerves (5 (Sensory to face, muscles mastication, Opthalmic…
Ear
Cranial nerves
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5
Sensory to face, muscles mastication
- Opthalmic (V1)
- Maxillary (V2)
- Mandibular (V3)
7
Taste (Ant 2/3 tongue), facial expression, secretion
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3
Eye movement, pupil size + lens
10
Taste (back oral cavity)/ sensory thoracic + abdominal viscera, movement + secretion
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11
Movement pharynx, larynx and neck
1
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Olfactory bulb, tract, nerve fascicles in olfactory mucosa (upper part nasal cavity)
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Ear
Middle
Air containing cavity: petrous part temporal bone
- Mucous membrane
- audiory ossicles, vibrations, tympanic membrane, perilymph internal ear
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External
External auditory meatus
- Auricle to tympanic membrane
- Walls outer third meatus: elastic cartilage
- Inner two thirds: Bone
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Balance
Vestibular apparatus
- Semicircular canals
- Utricle + saccule
Sensory receptors balance organised unique structures in vestibular apparatus
- Macula of utricle
- Macula of saccule
- Crista (in ampulla of each semi-circular canal)
- Whenever head begins or ceases to move, movement of head accelerates or decelerates: endolymph in membranous labyrinth changes its speed of movement realtive to that of walls + detected by sensory receptors
Macula Utricle: centrifugal + vertical acceleration
Macula of saccule: Linear acceleration
Crista: movement any direction: semicircular ducts being arranged right angles to eachother: all three planes represented
Hearing
- External auditory meatus
- Tympanic membrane
- Malleus
- Incus
- Stapes
- Oval window
- Scala vestibuli
- Spiral organ
- Cochlear duct
- Helicotrema
- Scala tympani
- Round window
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Tract
- Receives raw signals + adds perception
- Organised according to frequency of sound