Neuro Section 5- Part 1 Flashcards
What system is a bilateral receptor located in the inner ear?
Vestibular system
What system information the brain about the position and motion of the head?
Vestibular system
What system gives the sense of equilibrium and balance?
Vestibular system
What system is composed of 3 semicircular ducts and the utricle and saccule?
Vestibular system
What provides the brain with information about:
Static tilt of head
Linear and rotary acceleration of head
Vestibular system
What does the displacement of the capsule in a given direction cause ALL the cilia to do?
Bend in the same direction
What are the receptor units in the vestibular structures?
Hair cells
What in the cilia open and cause depolarization?
Mechanosensitive K+ channels
If cilia bend toward the kinoculium =
Depolarization
If bending in the opposite direction =
Hyperpolarization
Depolarization = increased or decreased frequency?
Increased
Hyperpolarization = increased or decreased frequency?
Decreased
What 2 parts of the vestibular system have the function of: rotary acceleration and deceleration of the head?
Ampulla of semicircular ducts
What does NOT cause stimulation of crista ampullaris?
Constant rotational velocity
What do the semicircular ducts prove the brain with?
Information about the direction and nature of head movements
The semicircular ducts are on the opposite sides of the head but at the same plane= both move in ________ directions during rotary acceleration/deceleration
Opposite
What is the receptor organ located in the utricle and saccule?
Macula
What is the heavy and dense layer above the gelatinous layer that covers the cilia?
Otoliths
What detects the linear acceleration/deceleration and static tilt of the head?
Otoliths
What causes the otoliths to fall over by gravity and remain fallen over?
If the head tilts
If the head tilts, the hair cells ____
Bend
What makes otoliths lag behind producing a bending of the hair cells?
If the body moves in a linear direction
What reflexes coordinate eye and head movements?
Vestibulo ocular reflexes
Vestibulo-ocular reflexes- When the body moves, the eyes remain ______ on the organ field of vision for as long as possible
Fixed
