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The surface of the postcentral gyrus contains the?
primary motor
The primary somatosensory area of the cerebral hemisphere is found in the precentral gyrus. true or false?
no the precentral gyrus is the primarymotor area and postcentral gyrus is the sensory area
What area is posterior to the central sulcus?
Postcentral gyrus, or the parietal lobe [Edit: The postcentral gyrus is posterior to the central sulcus, not anterior. The primary motor cortex is located directly anterior to the central sulcus.]
What function does the precentral gyrus have?
The precentral gyrus, also referred to as the "motor strip," contains neurons that project to muscles to execute movement of body parts. Different areas of the motor strip contain neurons that execute movements of different body parts, e.g. legs, arms, lips, etc., with areas of the body capable of more fine movements, e.g. fingers, being controlled in the motor strip by a greater number of neurons than are areas of the body capable only of gross movements, e.g. abdomen.
In which is the cerebral lobes would the primary motor area be found?
The primary motor area is found in the frontal lobe of the brain.
What is a raised area on the Cerebral Cortex?
A Ridge/Hill is called a Gyrus (pl Gyri) and a cleft/valley is called a Sulcus (pl Sulci). Some of the Gyri and Sulci are individually named for example look at the cerebrum from a lateral view. You should see one fairly distinct vertical sulcus roughly in the middle of the brain (it will not be straight but reasonably obviously vertical. This is called the Central Sulcus. The gyrus immediately in front of that sulcus is called the Precentral Gyrus and the one behind is called the Postcentral Gyrus. The precentral is where the Primary Motor Cortex is seen and the postcentral is where the Somatosensory Cortex is seen. There are many other named sulci and gyri but it is too complicated to describe them without an image.
A knee-jerk reflex employs motor neurons and what?
it employs sensory and motor neurons
What are the general functions of the somatic nervous systems?
The somatic nervous system processes sensory information and controls all voluntary muscular systems within the body, with the exception of reflex arcs. The basic route of nerve signals within the efferent somatic nervous system involves a sequence that begins in the upper cell bodies of motor neurons (upper motor neurons) within the precentral gyrus (which approximates the primary motor cortex). Stimuli from the precentral gyrus are transmitted from upper motor neurons and down the corticospinal tract, via axons to control skeletal (voluntary) muscles. These stimuli are conveyed from upper motor neurons through the ventral horn of the spinal cord, and across synapses to be received by the sensory receptors of alpha motor neuron (large lower motor neurons) of the brainstem and spinal cord. Upper motor neurons release a neurotransmitter, acetylcholine, from their axon terminal knobs, which are received by nicotinic receptors of the alpha motor neurons. In turn, alpha motor neurons relay the stimuli received down their axons via the ventral root of the spinal cord. These signals then proceed to the neuromuscular junctions of skeletal muscles. From there, acetylcholine is released from the axon terminal knobs of alpha motor neurons and received by postsynaptic receptors (Nicotinic acetylcholine receptors) of muscles, thereby relaying the stimulus to contract muscle fibers.
What neurons carry motor impulses?
Motor neurons
Where are the sensory and motor cortex located?
The motor cortex is in the frontal lobe of the brain whilst the sensory cortex is in the parietal lobe. Another main difference is that the motor cortex controls movements of fine and gross motor skills whereas the sensory cortex controls feelings of touch and sensation.
Is the primary motor cortex the surface of the precentral gyrus?
Yes :)
What type of neurons are multipolar?
Motor neurons and intern neurons
