Joints of the Ossicular Chain & Ligaments and Muscles of the Middle Ear Flashcards
1
Q
List the Joints of the Ossicular Chain.
A
- Malleoincudal joint
- Incudostapedial joint
2
Q
What does the malleoincudal joint do?
A
- Connects the malleus to the incus (could also be called the incudomallear joint but not in this class)
3
Q
What does the Incudostapedial joint do?
A
- Connects the incus to the stapes
4
Q
Name the Ligaments of the Middle Ear.
A
- Superior malleolar ligament
- Lateral malleolar ligament
- Anterior malleolar ligament
- Posterior ligament of the incus
- Superior ligament of the incus
5
Q
What does the superior malleolar ligament do?
A
- Holds the head of the malleus to the roof of the epitympanic recess
6
Q
Location details for the lateral malleolar ligament
A
- Extends from the neck of the malleus to the bony wall just superior to the tympanic membrane
7
Q
Location details for the anterior malleolar ligament
A
- Extends from the anterior process of the malleus to the anterior wall of the middle ear
8
Q
Location detail and function of the posterior ligament of the incus
A
- Extends from the short process of the incus to help suspend the incus
9
Q
What does the superior ligament of the incus do?
A
- Binds the head of the incus to the roof of the epitympanic recess
10
Q
List the muscles of the Middle Ear.
A
- Tensor tympani
- Stapedius
11
Q
What nerve innervates the tensor tympani?
A
- Vth (trigeminal) cranial nerve
12
Q
Innervation of the stapedius muscle:
A
- VIIth (facial) cranial nerve
13
Q
What are the functions of the tensor tympani?
A
- Pulls malleus anteromedially
- Reduces the range of movement of the tympanic membrane and stiffens ossicular chain
14
Q
What are the functions of the stapedius?
A
- Rotates footplate of stapes posteriorly (opposite the tensor tympani)
- Stiffens the ossicular chain
