Special Senses: Hearing, Balance

External Ear

B

Middle Ear

C

Inner Ear

D

Auricle

Helix

Antihelix

Lobule

Concha

Tragus

Antitragus

1. Posterior Auricular A

2. Superficial Temporal A

3. Occipital A

Vessels to the Auricle

Superficial

1. Cervical Plexus

2. Mandibular Trigeminal N

Deep

1. Vagus N

2. Facial N

Innervation of Auricle

External Acoustic Meatus

9

1. Mandibular Trigeminal

2. Vagus N

3. Facial N

Innervation of External Auditory Meatus

Tympanic Membrane

1. Mandibular Trigeminal N

2. Vagus N

3. Facial N

Innervation of External Tympanic Membrane

Glossopharyngeal N

Innervation of Internal Tympanic Membrane

Tympanic Cavity

Epitympanic Recess

Malleus

1

Anterior Process of Malleus

Lateral Process of Malleus

Handle of Malleus

2

Incus

2

Body of Incus

(Articulates with Malleus)

Short Limb of Incus

Long Limb of Incus

(Articulates with Stapes)

Stapes

7

Head of Stapes

(Articulates with Long Limb Incus)

Limbs of Stapes (Anterior/Posterior)

Base of Stapes

Tensor Tympani

(Tenses TM in Loud Noises)

Stapedius

(Pull Stapes posteriorly to protect from over vibration/loud noises)

Oval Window

K (Not Bone)

Eustachian Tube/Pharyngotympanic Tube

(Pressure Control)

Aditus Mastoid Antrum

Mastoid Antrum

D

Round Window

F

Bony Labyrinth

Blue

Membranous Labyrinth

(Perilymph)

Red

Utricle

(Linear Acceleration, Head in Respect to Gravity)

(Head Tilting)

U

Saccule

(Linear Acceleration, Head in Respect to Gravity)

(Head Tilting)

S

Vestibule

7

Semicircular Canals

(Dynamic Equilibrium)

6

Semicircular Duct

Crista Ampularis

Ampullary Cupula

(Rotational Movement)

1. Otoliths

2. Otolith Membrane

3. Hair-Like Sensory Cells

Maculae Composed of:

Otoliths

A

Otolith Membrane

Hair-Like Sensory Cells

C

Utricle: Horizontal

Saccule: Up & Down

Orientation of Maculae

Cochlea

(Endolymph)

8

Scala Vestibuli

(Perilymph)

Green

Scala Tympani

(Perilymph)

Purple

Modiolus

(Cochlea Swirls around Column)

Vestibular Membrane of Cochlea

Basilar Membrane of Cochlea

Spiral Organ

(Hair Cells)

Vestibulocochlear N