| A B | These sensory fibers deliver impulses from the skin, skeletal muscles, and joints somatic sensory fibers | These sensory fibers come from visceral organs visceral sensory fibers | Nerve fibers that carry impulses away from the central nervous system and activate muscles and glands motor or efferent |
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What nervous system carries impulses to skeletal muscles?
The somatic nervous system, also called the somatomotor or somatic efferent nervous system , supplies motor impulses to the skeletal muscles. Because these nerves permit conscious control of the skeletal muscles, it is sometimes called the voluntary nervous system.
What neuron carries impulses from CNS to muscles?
Afferent, or sensory, neurons carry impulses from peripheral sense receptors to the CNS. They usually have long dendrites and relatively short axons. Efferent, or motor, neurons transmit impulses from the CNS to effector organs such as muscles and glands. Efferent neurons usually have short dendrites and long axons.
What fibers carry impulses from the CNS to the PNS?
Efferent, or motor, nerve fibres carry impulses away from the central nervous system; afferent, or sensory, fibres carry impulses toward the central nervous system. Visceral fibres innervate the viscera such as the heart and intestines, and somatic fibres innervate the body-wall structures such as skin...
Which fiber type carries motor impulses to skeletal muscles?
General somatic efferent fibers carry motor impulses to somatic skeletal muscles. In the head, the tongue and extraocular muscles are of this type. Cranial nerves III, IV, VI, and XII carry these fibers. 90.
What are the two main division of nervous system?
The nervous system has two main parts: The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
What connects the central nervous system to the rest of the body?
Overview. The nervous system is organized into two parts: the central nervous system, which consists of the brain and the spinal cord, and the peripheral nervous system , which connects the central nervous system to the rest of the body.
What are the 3 types of nervous tissue?
Neurons, or nerves, transmit electrical impulses, while neuroglia do not; neuroglia have many other functions including supporting and protecting neurons.
What nerve carries impulses to the brain?
Sensory neurons transmit nerve impulses from sense organs (eyes, ears, nose, tongue and touch) to the brain. They also carry nerve impulses to the brain and spinal cord. Motor neurons transmit nerve impulses from the brain and spinal cord to a specific area of the body.
What is a bundle of axons called?
In the peripheral nervous system a bundle of axons is called a nerve . In the central nervous system a bundle of axons is called a tract. Each axon is surrounded by a delicate endoneurium layer. The course connective tissue layer called perineurium, binds the fibers into bundles called fascicles.
What is the peripheral nervous system comprised of?
Overview. The peripheral nervous system refers to parts of the nervous system outside the brain and spinal cord. It includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions .
What body part sends messages to the brain?
The thalamus carries messages from the sensory organs like the eyes, ears, nose, and fingers to the cortex. The hypothalamus controls your pulse, thirst, appetite, sleep patterns, and other processes in your body that happen automatically.
What is the main function of the peripheral nervous system?
Peripheral nerves reside outside your brain and spinal cord. They relay information between your brain and the rest of your body . The peripheral nervous system is divided into two main parts: Autonomic nervous system (ANS): Controls involuntary bodily functions and regulates glands.
How does a somatic motor nerve stimulate a skeletal muscle fiber to contract?
When a somatic motor neuron is activated, all of the muscle fibers it innervates respond to the neuron’s impulses by generating their own electrical signals that lead to contraction of the activated muscle fibers.
What are the 3 parts of the peripheral nervous system?
The PNS. The PNS comprises cranial nerves 3–12, the spinal roots, sensory and autonomic ganglia, and the somatic nerves .
What is difference between central nervous system and peripheral nervous system?
The main difference between central and peripheral nervous system is that the central nervous system receives sensory information and the processed information is sent into effector organs as the response whereas the peripheral nervous system is involved in sending information to the central nervous system and sending ...
