Vestibular Reflexes and Vision Stabilization

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What is the primary function of the cervico-ocular reflex?

To orient eye movement to changes in neck and trunk position (correct)
To regain postural stability by rapid muscle response
To stabilize the body in space during head movements
To detect linear acceleration of the head via the utricle and saccule

What type of reflex is responsible for regaining postural stability by rapid muscle response?

Stretch reflex (correct)
Vestibular ocular reflex
Vestibulospinal reflex
Cervico-colic reflex

What is the main function of the vestibulospinal reflex?

To stabilize vision during head movements
To orient eye movement to changes in neck and trunk position
To stabilize the body in space during head movements (correct)
To detect head rotation through the semicircular canals

Which of the following is a postural reaction?

Movement strategy (D) Signup and view all the answers

What is the primary function of the rotational VOR?

To detect head rotation through the semicircular canals (B) Signup and view all the answers

What is the main difference between the vestibular ocular reflex and the vestibulospinal reflex?

VOR is responsible for stabilizing vision, while VSR is responsible for stabilizing the body (D) Signup and view all the answers

What is the main function of the vestibular nuclei in the maintenance of upright posture?

To process vestibular input and coordinate impulses from other parts of the brain (D) Signup and view all the answers

What is the result of hair cell loss and neuronal loss in the vestibular nuclei with aging?

Reduced gain of the vestibular-ocular reflex (A) Signup and view all the answers

Which nucleus is primarily responsible for coordinating input to muscles of the extremities and trunk to maintain balance?

Lateral nucleus (B) Signup and view all the answers

What is the term for the process of increasing or reducing neural activity to maintain harmony with other functions in the CNS?

Modulation (A) Signup and view all the answers

What is the primary function of the utricle and saccule in the vestibular system?

To detect linear accelerations of the head in space (A) Signup and view all the answers

Which of the following structures is involved in the cervico-ocular reflex?

Medial nucleus (C) Signup and view all the answers

What is the primary function of the gaze stabilization system during active head and body movements?

To maintain the eyes' gaze direction and visual acuity (D) Signup and view all the answers

What is the Vestibulo-ocular reflex (VOR) primarily responsible for?

Stabilizing images on the retinas during head movement (C) Signup and view all the answers

What is the relationship between the gaze stabilization system and the VOR system?

The VOR system is one component of the gaze stabilization system (D) Signup and view all the answers

What happens to the eyes when the head moves to the right?

The eyes move to the left (B) Signup and view all the answers

What is the role of the brain in maintaining gaze stability?

To integrate the sensory and motor functions of gaze control (C) Signup and view all the answers

What is the primary purpose of the gaze stabilization system?

To stabilize the visual field during active head movements (A) Signup and view all the answers