Innervation of the Structures of the Ear (Not Including Audition)

The topic of this learning tool is "Innervation of the structures of the ear (not including audition)". Section one contains instructions on how to navigate this learning tool effectively and my justification for creating this tool in the way that it is presented. This is followed by three sections which cover the innervation of different regions of the ear. Throughout each section, material is assessed to reinforce learning and the final section is a selection of questions from throughout the module to provide anoverall assessment. It is advised that you work through the module in the order it has been set out, but you are free to navigate it as seen fit. 

1. How to Use this Learning Tool

Instructions for Use: Images and Navigation

Instructions for Use: Questions

Instructions for Use: Sections

Justification of Approach

Acknowledgements

2. External Ear

Aims

Overview of Anatomy

Can you identify the features of the external ear?

  • Anti-helix
  • Lobule
  • Conchae
  • Tragus
  • External acoustic meatus
  • Helix

Overview of Innervation of the External Ear

Great Auricular Nerve

Questions: Great Auricular Nerve

Lesser Occipital Nerve

Question: Lesser Occipital Nerve

Auriculotemporal Nerve

Question: Auriculotemporal Nerve

Makes a sharp superior turn
Arises from the mandibular division of the trigeminal nerve
Courses laterally, passing posterior to the temperomandibular joint
Passes in close relation to the marginal mandibular artery
Courses anterior to the external ear

Auricular Branch of the Vagus Nerve

Arnold's Ear Cough Reflex

Question: Auricular branch of the Vagus Nerve

Auricular Branch of the Facial Nerve

Question: Auricular branch of the Facial Nerve

Innervation of the Lateral Auricle

Question: Innervation of the Lateral Auricle

Innervation of the Medial Auricle

Question: Innervation of the Medial Auricle

Innervation of the External Acoustic Meatus

Question: Innervation of the External Acoustic Meatus

Сombine elements from the left column with the elements on the right
Supplies sensory innervation to the anterior and superior walls
 
Auriculotemporal nerve
Supplies sensory innervation to the posterior and inferior walls
 
Auricular branch of the vagus nerve

Auricular Mucles

Question: Auricular Muscles

3. Middle Ear

Aims

Overview: Middle Ear Anatomy

Facial Canal and Chorda Tympani

Questions: Middle Ear Anatomy

Tympanic Membrane

Question: Tympanic Membrane

Control of Middle Ear Pressure

Middle Ear Muscles

Middle Ear Muscle Reflex

Question: Middle Ear Muscles

Сombine elements from the left column with the elements on the right
Attaches between the eustachian tube and malleus
 
Mandibular division of the trigeminal nerve
Nerve that supplies the stapedius muscle
 
Tensor tympani
Nerve that supplies the tensor tympani
 
Stapedius
Attaches between the wall of the middle ear and the stapes
 
Facial nerve

Tympanic Plexus

Autonomic Innervation

Question: Tympanic Plexus

4. Internal Ear

Aims

Internal Ear Overview

The Vestibule

Semicircular Canals

Question: Anatomy of the Internal Ear

Сombine elements from the left column with the elements on the right
Suspended in perilymph
 
ampulla of the superior semicircular duct
Central portion of the bony labyrinth
 
membranous labyrinth
Have terminal swellings termed ampullae
 
Semicircular ducts
Contains a macula
 
Saccule
Contains a crista ampullaris
 
Vestibule

Vestibulocochlear Nerve

Question: Vestibulocochlear Nerve

Vestibular Apparatus: Maculae

Vestibular Apparatus: Cristae

Adaptation

Question: Afferent Signal Generation in the Vestibular System

Vestibulo-ocular Reflex

5. End of Module Quiz

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Сombine elements from the left column with the elements on the right
Ascends along the posterior border of the sternocleidomastoid muscle
 
Auricular branch of the vagus nerve
Ascends along the superficial surface of the sternocleidomastoid muscle
 
Auricular branch of the facial nerve
Not present in everybody
 
Great auricular nerve
Closely associated with the middle meningeal artery at its origin
 
Auriculotemporal nerve
Irritation can present as a cough
 
Lesser occipital nerve

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Innervation of the External Ear

Innervation of the Middle Ear

Сombine elements from the left column with the elements on the right
Courses between the layers of the tympanic membrane
 
Chorda tympani
Supplies the majority of the external (lateral) surface of the tympanic membrane.
 
Auriculotemporal nerve
Supplies the internal (medial) surface of the tympanic membrane
 
Glossopharyngeal nerve

Innervation of the Middle Ear

Innervation of the Middle Ear

Innervation of the Middle Ear

Innervation of the Middle Ear

Innervation of the Middle Ear

Innervation of the Internal Ear

Innervation of the Internal Ear

Innervation of the Internal Ear

Сombine elements from the left column with the elements on the right
Contains maculae
 
Utricle and saccule
Contains cristae
 
Semicircular ducts
Arranged at 90 degrees to each other
 
Ampullae

Innervation of the Internal Ear

Innervation of the Internal Ear

Innervation of the Internal Ear

Innervation of the Internal Ear: Kinetic Labyrinth

Innervation of the Internal Ear

References

Reference List