00:01
Hello students, the somatic nervous system and autonomic nervous system differ in their function and control over different type of muscles and organs.
00:12
The somatic nervous system controls voluntary movements and it is responsible for skeletal muscle contraction and this autonomic nervous system regulates involuntary movements and controls smooth muscles, cardiac muscles and glands.
00:35
And then the somatic motor pathway for voluntary flexion of the right index finger start with an upper motor neuron in the motor cortex of the brain.
00:43
The motor cortex sends signal down the corticospinal tract which crosses the medulla, the crossed fibers from the lateral corticospinal tract.
00:55
The lateral corticospinal tract descends through the spinal cord until it reaches the appropriate level where it synapses with lower motor neurons in the ventral horn of the spinal cord and from there the lower motor neurons send their axon out of the central nervous system through the ventral root of the spinal nerve and form synapses with effector muscles in the forearm especially the muscles responsible for flexing the right index finger.
01:23
And then the cerebellum plays a crucial role in the somatic nervous system by coordinating and fine -tuning voluntary muscle movements.
01:31
It receives sensory input from the body and compares it with the intended motor output from the motor cortex and the cerebellum then adjusts and modulates motor signals ensuring accurate and coordinated movements.
01:53
The pathway out of the central nervous system to the effector organ differs in the autonomic nervous system compared to the somatic nervous system.
02:01
In the somatic nervous system the pathway consists of a single upper motor neuron from the motor cortex directly synapsing with the lower motor neuron in the ventral horn of the spinal cord when or which then connects to the effector muscle.
02:15
In the autonomic nervous system the pathway involves two neurons a preganglionic neuron originating in the cns and the postganglionic neuron that connects the ganglia to the effector again...