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What will conduct a nerve impulse faster thick or thin axon?
Thick axons conduct nerve impulses faster than thin axons because they have a lower resistance to the flow of electrical signals. This allows for quicker transmission of signals along the axon.
What carries impulses from the cerebrum to lower CNS?
The cerebral peduncles carry motor impulses from the cerebrum to the lower central nervous system, specifically the brainstem. These impulses are responsible for controlling voluntary movements and coordinating motor functions.
Which fiber tract carries impulses from the cerebrum to lower CNS areas?
The corticospinal tract carries impulses from the cerebrum to lower CNS areas, primarily to control voluntary movements throughout the body. It is involved in motor function and helps in coordinating muscle movements.
What tract carries sensory impulses from the lower limbs and inferior body trunk?
The spinothalamic tract carries sensory impulses related to pain, temperature, and crude touch from the lower limbs and inferior body trunk to the brain.
Do impulses move faster or slower along the nerve at lower temperatures?
Impulses move slower at lower temperatures because temperature affects the speed of nerve conduction by altering the rate of chemical reactions involved in transmitting the impulse. Cold temperatures slow down these chemical reactions, causing nerve impulses to travel more slowly.
What will conduct a nerve impulse faster thick or thin axon?
Thick axons conduct nerve impulses faster than thin axons because they have a lower resistance to the flow of electrical signals. This allows for quicker transmission of signals along the axon.
What carries impulses from the cerebrum to lower CNS?
The cerebral peduncles carry motor impulses from the cerebrum to the lower central nervous system, specifically the brainstem. These impulses are responsible for controlling voluntary movements and coordinating motor functions.
A factor that determines the rate of impulse propagation or conduction velocity along an axon?
One factor that determines the rate of impulse propagation or conduction velocity along an axon is the myelination of the axon. Myelinated axons conduct impulses faster than unmyelinated axons due to the saltatory conduction mechanism, where the action potential jumps from one node of Ranvier to the next. Another factor is the axon diameter, as larger diameter axons have lower resistance to ion flow and can conduct impulses faster compared to smaller diameter axons.
What is the fiber tract that carries impulses to the cerebrum and then to the lower CNS called?
The fiber tract that carries impulses to the cerebrum and then to the lower CNS is called the corticospinal tract. It is involved in voluntary motor control and starts from the primary motor cortex in the cerebrum and descends to the spinal cord.
Which fiber tract carries impulses from the cerebrum to lower CNS areas?
The corticospinal tract carries impulses from the cerebrum to lower CNS areas, primarily to control voluntary movements throughout the body. It is involved in motor function and helps in coordinating muscle movements.
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to?
result in decreased transmission of nerve impulses, leading to impaired muscle function and weakness in the lower leg. This can manifest as difficulty walking, loss of coordination, and potentially muscle atrophy. Treatment may include physical therapy, medication, and in severe cases, surgery.
Which white matter tracts connect the cerebrum to the lower brain areas?
The internal capsule and the cerebral peduncles are white matter tracts that connect the cerebrum to lower brain areas such as the brainstem. These pathways are important for transmitting signals between different regions of the brain.
Do lower motor neurons have their cell bodies in the brain and their axons in the ganglia?
No, lower motor neurons have their cell bodies in the spinal cord or brainstem and their axons extend directly to the muscles they innervate. Ganglia are clusters of cell bodies located outside the central nervous system.
What tract carries sensory impulses from the lower limbs and inferior body trunk?
The spinothalamic tract carries sensory impulses related to pain, temperature, and crude touch from the lower limbs and inferior body trunk to the brain.
Which type of white matter fiber tract connects the cerebrum to lower centers like the spinal cord?
Projection Fibers
Do impulses move faster or slower along the nerve at lower temperatures?
Impulses move slower at lower temperatures because temperature affects the speed of nerve conduction by altering the rate of chemical reactions involved in transmitting the impulse. Cold temperatures slow down these chemical reactions, causing nerve impulses to travel more slowly.
What is the structure that contains a network of axons from several anterior rami is known as?
A plexus is the structure that contains a network of axons from several anterior rami. Examples include the brachial plexus in the arm and the lumbosacral plexus in the lower back and pelvis.
