Q1-4 1. What is the name of the neurons whose fibers are contained in the red- c
ID: 3518801 • Letter: Q
Question
Q1-4 1. What is the name of the neurons whose fibers are contained in the red- circled structure? What is/was the location of the first Synapse ON the fibers in the red structure? 2. ID structure outlined in green What is the thalamic target of fibers in this structure? To which cortical region will the thalamic fibers project? 3. Name three actions of the structure outlined in blue. Where are its cell bodies of origin? 0 4. Name an input to the structure circled in orange What is the name of the output fibers from this structure? Through what structure do they reach their final destination?Explanation / Answer
Answer 1
The red circled area is the olfactory bulb. It is an evaginated cortical structure that has 2 types of neurons namely projection neurons and interneurons
The first synapse in the olfactory bulb takes places when the incoming sensory axons synapse on the dendrites of olfactory bulb neurons i.e. mitral cells, tuft cells and periglomerular cells
Answer 2
The structure in green is optic nerve. The fibres of optic nerve reach the lateral geniculate body in the thalamus and then they are projected on the occipital lobe and hence reach the primary visual cortex area
Answer 3
The structure in blue is oculomotor nerve
Three uses of oculomotor nerve are-
1. Opening of eyelid and movements of eyeballs
2. Accomodation of lens
3. Constriction of pupil
The cell bodies of origin of oculomotor nerve is from motor neurons from oculomotor nucleus and edinger westphal nucleus which are somatic and visceral respectively
Answer 4-
The structure circled in orange is olive which is a part of medulla oblongata
An input to the olive is the source of cerebellum, fibres of which are referred to as climbing fibres
The output fibres from inferior olivary nucleus are called olivocerebellar fibres
These fibres reach the inferior penduncle to be distributed in the cerebellar hemisphere of the opposite side by passing through the hilum.
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