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The Ear
Anatomy of the ear
16
Anatomy
Undergraduate 3
02/05/2014

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Cards

Term
Name the 3 divisions of the ear
Definition
1. External
2. Middle
3. Inner
Term
Name the 3 structures of the outer ear
Definition
1. Auricle
2. Tympanic membrane
3. Acoustic canal
Term
Describe the boundaries of the external ear
Definition
From the auricle to the tympanic membrane, via the acoustic canal
Term
What type of tissue comprises the auricle?
Definition
Elastic cartilage
Term
What type of tissue comprises the acoustic canal?
Definition
Lateral 1/3 is cartilage, medial 2/3 is bony
Term
List 3 features of the epithelia of the outer portion of the acoustic canal
Definition
- Hair
- Sebaceous glands
- Ceruminous glands
Term
What structure makes up the middle ear?
Definition
It is a chamber in the temporal bone
Term
Name the features of the middle ear
Definition
- Ossicles
- Entrance to the auditory tube
- Round window
- Oval window
Term
Name the 3 ossicles, in order from lateral to medial
Definition
Malleus
Incus
Stapes
Term
What is the function of the ossicles?
Definition
Connect the tympanic membrane to the oval window and its membrane to transmit sound to the inner ear
Term
How is the inner ear formed? What is this structure known as?
Definition
Hollowed from the bone - a bony labyrinth
Term
What is the membranous labyrinth?
Definition
A series of membranous sacs
Term
What fluid is found within the bony labyrinth? The membranous?
Definition
Perilymph; endolymph
Term
What organ senses hearing?
Definition
The cochlea
Term
What organs sense balance?
Definition
The vestibular apparatus
Term
What nerve innervates the organs of sensation in the ear?
Definition
CN VIII
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