Question

The utricle and saccule are: -
A. Involved in lateral integration of visual signals
B. Visual centers in the cortex
C. Part of the vestibular apparatus responsible for positional information about the head
D. Semicircular canals that respond to head rotation

Answer 1

The bony labyrinth, a complicated hollow within the temporal bone, houses the inner ear. The utricle and saccule are two tiny fluid-filled recesses in the vestibule, a central area. The semicircular canals and the cochlea are connected by these. The dynamic balance is maintained by three semicircular canals that are positioned at right angles to one another.

Complete answer:
Option A: The eye is the most important sense organ in vision. The pupil allows light waves to pass past the cornea and into the eye. The cornea is the transparent layer that protects the eye. It acts as a barrier between the inner eye and the outer environment, as well as assisting in the concentrating of light waves entering the eye.
Hence, option A is incorrect.
Option B: The visual cortex is the part of the cerebral cortex that deals with visual information. The occipital lobe is where it is found. Sensory input from the eyes passes through the thalamus's lateral geniculate nucleus before reaching the visual cortex.
Hence, option B is incorrect.
Option C: The vestibular system in the inner ear's sensory equipment that aids in maintaining postural balance. The vestibular system's input is also necessary for coordinating the position of the head and the movement of the eyes. The utricle and saccule are semilunar canals and does not function in coordinating the position of the head or any positional information about the head
Hence, option C is incorrect.
Option D: The otolith organs in the vertebrate inner ear are the utricle and saccule. They are part of the vestibule of the bony labyrinth's balancing mechanism. These are semilunar canals. They are responsible for head rotation.
Hence, option D is correct.

Hence, Option D is the correct answer.

Note:
The semicircular canals, which are at right angles to one another, are a component of the bone labyrinth. Each semicircular canal has a dilated sac called an osseous ampulla at one end that is more than double the canal's diameter. The semicircular ducts give sensory input for rotating movement experiences. The pitch, roll, and yaw axes are where they're oriented.