3B. Vestibular System Flashcards
What are the two roles of the vestibular system?
- Maintain a position of eyes, neck, trunk, and limbs based on head position and movement
- Reflexes for balance, antigravity muscles
What in the Vestibular apparatus contains the specialized receptors or those special proper receptors that are going to detect changes in position of the head?
Membranous Labyrinth
In the Bony labyrinth we are going to find:
Perilymph
In the Membranous labyrinth we are going to find:
Endolymph
the ridge of the ampulla
crista ampullaris
Inside the ______________ is where all the hair cell receptors will be embedded
crista ampullaris
Ampulla of a semicircular duct: crista ampullaris to detect angular, also known as:
Dynamic equilibrium
(Rotary motion of the head)
Utriculus and sacculus in the vestibule: macula to detect linear, also known as:
Static equilibrium
an oval-shaped plaque-like region along the membranous portion of the labyrinth
Macula
an involuntary rhythmic side-to-side, up and down or circular motion of the eyes that occurs with a variety of conditions
Nystagmus
What are the classic signs of Vestibular disease?
- Head tilt
- Ataxia and changes in extensor tone
- Circling, rolling
- Pathologic Nystagmus
The vestibular nerve directly:
synapses on vestibular nuclei in the brainstem
The macula is located in the:
utriculus and sacculus
Rotary motion is detected by:
crista ampullaris
The anatomic basis of central vestibular disease identifies structures located in the:
brainstem
