What evolutionary advantage does tight oligodendrocyte myelination in the brain provide and which protein is responsible? slower conduction velocities in the spinal cord, PLP/DM20 greater space for neuron growth and density in the cranium, PLP/DM20 greater space for glia and blood vasculature in the cranium, PO perception of distant objects, PO/DM20
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slower conduction velocities in the spinal cord, PLP/DM20
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greater space for neuron growth and density in the cranium, PLP/DM20
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greater space for glia and blood vasculature in the cranium, PO
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perception of distant objects, PO/DM20
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- What function do unipolar neurons provide and where is their cell body found? They are motor neurons with their cell body in the central nervous system They are sensory neurons with their cell body located in the central nervous system They are motor neurons with their cell body located outside of the central nervous system They are sensory neurons with their cell body located outside of the central nervous systemFollowing administration of an opiate drug, "pain signals" are prevented from getting out of the spinal cord via two mechanisms. One inhibits spinal cord neurons that communicate with the parafascicular nucleus of the thalamus. What is the other way that pain signals are stopped? dendro-dendritic synapses that enhance IPSI's in somatosensory neurons. the disinhibition of long axons that start in the spinal cord and influence free nerve endings directly. O a feedback loop to the periaquedictal grey of the midbrain, which enhances neural activity in that area. axo-axonic synapses that prevents somatosensory neurons from releasing neurotransmitter.Which of the following statements best describes the axonal projection patterns of upper motoneurons located in the primary motor cortex? Upper motoneurons located in the primary motor cortex are cholinergic and their axons project directly to muscle fibres to control voluntary muscle movements. Upper motoneurons located in the primary motor cortex are glutamatergic and their axons project to the thalamus, brain stem and directly to muscle fibres to control voluntary muscle movements. Upper motoneurons located in the primary motor cortex project to the spinal cord where they synapse with cholinergic lower motoneurons that control voluntary muscle movements. Upper motoneurons located in the primary motor cortex project to neurons in the cerebellum, thalamus and brain stem that in turn contact lower motoneurons in the spinal cord to control voluntary muscle movements.
- Somatic sensory and somatic motor information are propagated via specialized neurons. If you dip your toes in a hot tub before entering the tub, the action potentials generated by the water temperature travels via which of the following structures before it can be perceived by you? O unipolar neurons from the toes to the spinal nerve, ventral root, spinal cord, thalamus, primary somatosensory cortex O unipolar neurons from the toes to the spinal nerve, dorsal root, spinal cord, thalamus, primary somatosensory cortex O multipolar neurons from the toes to the spinal nerve, ventral root, spinal cord, thalamus, primary somatosensory cortex O multipolar neurons from the toes to the spinal nerves, dorsal root, spinal cord, thalamus, primary somatosensory cortexSubjecting neurons in the perforant pathway to tetanus stimulation strengthens activity in the dentate gyrus, indicating that long-term potentiation does not occur in the hippocampus. the hippocampus is involved in memory. synapses in the brain do not behave like Hebbian synapses. synapses in the brain can behave like Hebbian synapses.Could you please draw the Paypez circuit as a loop and not inside the brain? The circuit goes through the following neural pathways: Hippocampal formation (subiculum) → fornix → mammillary bodies → mammillothalamic tract → anterior thalamic nucleus → cingulum → entorhinal cortex → hippocampal formation.
- Bob suffers a heart attack and clutches his chest. How is sensory and motor information propagated in this event Group of answer choices both sensory and motor information from his arms are propagated via spinal nerves multipolar neurons carrying motor information to the muscles of his arm exited the dorsal root of the spinal nerve unipolar neurons carrying sensory information from his heart entered the ventral root of the spinal nerve somatic sensory neurons carried the pain signals from his heart to the primary sensory cortexIf a mosquito bites you in the forearm, action potentials will have to reach the CNS before you can perceive the bite and react by swatting the mosquito. Which one of the following is the correct sequence of events that takes place from the time the mosquito bites you until you swat it? O somatic sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal muscles O visceral sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal muscles somatic sensory receptors, efferent division, primary somatosensory cortex, primary motor cortex, afferent division, SNS, skeletal muscles special sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal musclesThe dorsal column system crosses to the contralateral side of the nervous system at the level of the before reaching the in the ___. medulla; primary somatosensory cortex; parietal lobe spinal cord; primary motor cortex; frontal lobe medulla; primary motor cortex; frontal lobe spinal cord; primary somatosensory cortex; parietal lobe Question 2 Which of the following are true about somatotopy and retinotopy? Adjacent parts of the body or retina are represented far away each other, rather than in neighbouring areas of the cortex All items are true 1 pts These maps are 'fixed' and cannot be changed by experience The 'maps' for both are distorted to represent differences in the density of input
- ахon transmits information away from the cell body (centrifugal) and that ends by the terminal arborization. Only axons are surrounded by a myelin sheath. to the cell body (centripetal) and the axon that PROBI NG Ithe ACTIVITY What are the structural constituents of the gray matter, the white matter, and the nerve? Draw a neuron then use the different documents of the activity to determine, on the figure, t location of each part of the neuron in the nervous system. Using docs a, b, and c, draw and label a transverse section of the spinal cord, a cell body, a transverse section of a nerve.An individual diagnosed with CMT has difficulty holding a cup because: a. The myelin in the motor neurons is damaged thereby preventing an impulse frommoving along the axonb. The myelin in the sensory neurons is damaged thereby preventing an impulse frommoving along the axonc. The dendrites in the motor neurons are damaged thereby preventing an impulse frommoving along the axond. The dendrites in the sensory neurons are damaged thereby preventing an impulse frommoving along the axonIdentify and label the following structures on the neuron model figure below: cell body, dendrites, neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath, axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer to Figure 10.6). 3) 11