The first synapse in the motor pathway occurs in the anterior horn of the spinal cord. Motor neurons, which originate in the motor cortex of the brain, send their axons down through the corticospinal tract and synapse with lower motor neurons located in the anterior horn. This connection is crucial for transmitting motor commands from the central nervous system to skeletal muscles.
The motor neuron is the final common pathway for all neurons to travel to complete their synapse. Afferent neurons or unipolar neurons all pass through the cord and brain on this journey.
Reflexes are rapid involuntary responses to a given stimuli. The reflex pathway that only has one synapse in the CNS is called the monosynaptic reflex arc.
The first motor neuron in an autonomic pathway is called a preganglionic neuron. It originates in the central nervous system and synapses with a postganglionic neuron in an autonomic ganglion.
motor end plate
The nerve impulse pathway of a voluntary action begins in the brain, where motor commands are generated in the motor cortex. These signals travel down the spinal cord through upper motor neurons, which synapse with lower motor neurons in the spinal gray matter. The lower motor neurons then send impulses through their axons to the skeletal muscles, causing contraction and movement. This entire process involves the integration of sensory feedback and coordination from various brain regions to execute the voluntary action smoothly.
Many upper motor neurons synapse with lower motor neurons in the ventral horn of the spinal cord. This is where the cell bodies of lower motor neurons are located, allowing for the direct control of muscle function.
Monosynaptic refers to a neural pathway involving just one synapse, while polysynaptic involves multiple synapses. Monosynaptic pathways are direct and involve only two neurons, while polysynaptic pathways are more complex and involve multiple relay neurons.
The neurotransmitter in a somatic motor pathway is acetylcholine. It is released by motor neurons at the neuromuscular junction to stimulate muscle contraction.
cerebellum
neuromuscular junction
The neurons of the motor pathway control muscle movements by sending signals from the brain to the muscles. These signals coordinate and regulate voluntary movements such as walking, reaching, and grasping.
A contralateral motor pathway is a neutral pathway located at the opposite side of the brain. It is on the eighth nerve of the cochlear nucleus.