Semicircular Canals Flashcards
1
Q
Two details about the semicircular canals
A
- Lie in three planes, perpendicular to one another
- Filled with endolymph
2
Q
What is the function of the semicircular canals?
A
- Responsible for the sensation of movement of the head in space
(senses the different directions our head moves)
3
Q
List the structures of the semicircular canals. (Crus Commune & Ampulla not labeled)
A
- Superior semicircular canal
- Posterior semicircular canal
- Lateral semicircular canal
- Crus commune
- Ampulla
- Crista (crista ampullaris)
4
Q
Location details for the superior semicircular canal
A
- Also called the anterior semicircular canal
- Vertical (lies in a vertical plane)
5
Q
Location details for the posterior semicircular canal
A
- Posterior (well, of course!)
- Vertical (lies in a vertical plane)
6
Q
Position detail for the lateral semicircular canal
A
- Horizontal
7
Q
What/where is the crus commune?
A
- shared aperture opening into the vestibule of the superior and posterior semicircular canals
8
Q
What/where are the ampulla?
A
- Enlarged ends of the semicircular canals
- Houses the crista
9
Q
What/where are the crista (crista ampullaris)?
A
- Located within the ampulla
- Receptor organ for movement
10
Q
List the structures of the crista.
A
- Hair cells
- Stereocilia receptor cells
- Kinocilium
- Cupola
11
Q
What are stereocilia receptor cells?
A
- Minute hair cells that sense movement in fluid
12
Q
What are kinocilium?
A
- Specialized primary cilia (longest)
13
Q
What is the cupola?
A
- A gelatinous mass that overlays the stereocilia of the cupola (text book says crista ampularis–instead of cupula–which makes more sense)
14
Q
Label the diagram (Incomplete diagram, missing kinocilium)
A
