1. Identify the structures that link thalamic nuclei with the sensorimotor corte

Question

1. Identify the structures that link thalamic nuclei with the sensorimotor cortex.

corticothalamo fiber tracts

thalamocortical fiber tracts

2. The term cortex denotes an outer surface. In the case of the CNS, a cortex, in essence, is a nucleus that is spread over an area as opposed to being compacted within a limited space, e.g. the brainstem’s vestibular nuclei. This arrangement, in combination with a laminar arrangement of neurons and cortical folding, serves to increase neuronal numbers. That said, is the neuroanatomical structure of the cerebellar and cerebral cortices the same?

yes

no

3. Which cortex is characterized by neurons organized within columns as well as layers?

cerebellar

cerebral

4. Depth perception, pattern discrimination, and orientation of the body relative to a point of interest are enabled by neurons within the

sensorimotor cortices of the left and right cerebral hemispheres

midbrain

5. Reflex turning of the head towards a visual stimulus is enabled by neurons within the

sensorimotor cortices of the left and right cerebral hemispheres

midbrain

6. The sensorimotor cortex contains a majority of interneurons and a minority of premotor neurons. The former integrate visual, auditory, and tactile sensory information whereas the latter initiate a motor response.

The ultimate target cells of the premotor neurons are

spinal cord interneurons

-motor neurons within brainstem and spinal cord motor nuclei

7. Our model animal fixed its gazeon an object of interest while walking towards it. In other words, even though the head moved through space, the eyes remained fixed on point of interest in space. This ability was mediated by an on-going

vestibulo-cervical reflex

vestibulo-ocular reflex

Explanation / Answer

ans 1 ---- corticothalamo fibres.

ans 2 ---- yes.

ans 3 --- cerebral cortex.

ans 4 ---- sensorimotor cortices of left and right hemispheres.

ans 5 -- sensorimotor cortices of left and right hemispheres..

ans 6 ---- alpha motor neurons within the brain stem and spinal cord motor nuclei.

ans 7 --- vestibulo - ocular reflex

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