There are 3 scenarios provided. Each one is worth 25 points. For each of them, y
ID: 40124 • Letter: T
Question
There are 3 scenarios provided. Each one is worth 25 points. For each of them, you should write a description of the pathway that information takes as it is sensed, travels to the CNS, within the CNS, and out of the CNS to an effector. The types of information provided should include the types of receptors involved, incoming and outgoing pathways to/from the spinal cord, through the spinal cord to/from the brain, and to/from different areas of the brain. Include all major parts of the brain that a particular signal would travel through and the types of fibers that a signal travels through within the cerebrum. Include both gray and white matter areas. You do not need to discuss the electrical signalling mechanism of information travel. However, you should include each neuron in a pathway by name: 1st, 2nd, or 3rd order/upper or lower, etc. Make sure to include crossing over from one side of the body to the other when appropriate.
Scenario 1: When you enter the kitchen, you smell and see freshly baked chocolate chip cookies cooling on a plate. You know that you shouldn't eat one because you are trying to lose weight, but you decide to eat one anyway, so you reach out to pick one up. By the time it reaches your mouth, you have begun to salivate.
Scenario 2: You walk out of a dark movie theater into bright sunlight. Your pupils constrict, you squint your eyes and raise your arm to shield your face.
Scenario 3: You step on a piece of glass and immediately pull your foot away. You feel pain and see that you are bleeding. You decide that you had better clean it up and get a bandaid to cover the wound.
Explanation / Answer
S Motor fibres to muscles of face, Saliva secretion is a mixed activity , the innervations involved are,Sensory fibres to taste buds on posterior 2/3rd part of tongue. Motor fibres to muscles of face, salivary glands and neck,
It is motor function, Movement of eye, occipital area is responsible for sight, Iris contain two groups of smooth muscles, which are innervated by symapthetic nerves. The pupil gets wider in the dark and narrower in the light. Sensory nerves are involved which take the information from eye muscles to the CNS for the action. But sudden closing of eyes during any obstruction near the eye like somebody waving the hand suddenly near our eye is a reflex action.
Stepping the foot immediately is a reflex action, here spinal cord is involved. Then the info goes to the brain. First sensory neuron take the information to the brain and the brain analyse and process it and through the association neuron and then to the motor neuron. they take the information to the affected part. Then brain will respond by the next action like dressing the wound etc
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