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Physiology_L13, Posture and body equilibrium, Part 1,2

L13, Posture and body equilibrium

Part 1


 Part 2



MCQ

Q1: Stimulation of crista ampuliaris leads to:
a) vertigo
b) static tremors
c) dysdiadokinesia.
d) shuffling gait.
e) hypertonia.

Q2: Vertigo:
a) results from stimulation of macula. 
c) results from crista ampullaris stimulation,
e) b & d are correct.
b) means oscillatory eye movement.
d) means sense of rotation in the presence of rotation

Q3: Vertigo:
a) results from stimulation of otolith organ.
c) results from stimulation of crista ampullaris. 
e) is a manifestation of LMNL.
b) means oscillatory eye movement. 
d) results from basal ganglia lesion.

Q4: Crista ampullaris of horizontal semicircular canal is stimulated
a) when cupula is moved toward the utricle. 
b) at the start of rotation due to momenturn of endolymph..
c) during rotation with constant speed. d) by high weight of otoconia.
e) after stoppage of rotation due to inertia of endolymph.

Q5: Stimulation of crista ampullaris:
a) results in kinetic tremors. 
c) occurs when kinocillium bends toward sterocilia,
b) is caused by weight of otoconia.
 d) leads to nystagmus.
e) results in decreased muscle tone in the side of stimulated canal.

Q6: Stimulation of the semicircular canals causes
a) rotatory nystagmus whose fast component is in the opposite direction of rotation
b) vertigo which is a false sensation of rotation in the direction of rotation
c) autonomic responses including nausea, vomiting and hypertension. 
d) increased muscle tone in the stimulated side
e) all of the above are correct

Q7: Macula (otolith) organ:
a) detects angular acceleration..
c) detects linear acceleration.
e) leads to vertigo when stimulated.
b) is stimulated by movement of endolymph.
 d) is the receptor in the semicircular canal.

Q8: Nystagmus:
a. is observed only at the beginning of rotation
b. has no aim
c. is not observed during rotation
d. slow component, is in the opposite direction of rotation

 Q9:Nystagmus is carried by fibers passing from the Vestibular nucleus to:
a. the spinal cord
b. the reticular formation 
c. the folliculonodular lobe of the cerebellum
d. the medial longitudinal bundle

Q10:The otolith organs are receptors for:
a. angular acceleration
b. linear acceleration
c. vibration sense
d)proprioceptive

Q11:Otolith organs (utricle and saccule) are responsible for:
a. detecting angular acceleration 
b. detecting the position of the head in space
c. producing the stretch reflex
d. producing vertigo

Q12:Otoliths:
a. are located only in the semicircular canals
 b. are located only in the utricle and saccule
c. stimulated when head in the vertical position
d. stimulate hair cells, transducing angular acceleration


Answer


1-a
2-c
3-c
4-a
5-d
6-d
7-c
8-d
9-d
10-b
11-b
12-b
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