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The general (spinal) somatic efferent neurons (GSE, somatomotor, or somatic motor fibers) arise from motor neuron cell bodies in the ventral horns of the gray matter within the spinal cord. They exit the spinal cord through the ventral roots, carrying motor impulses to skeletal muscle through a neuromuscular junction. [1] Of the somatic ...
A motor neuron (or motoneuron or efferent neuron [1]) is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon (fiber) projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs, mainly muscles and glands. [2]
Spinal nerves: They are mixed nerves that carry sensory information into and motor commands out of the spinal cord. [6] The spinal nerves serve as a bridge between the environment and the central nervous system (CNS). These neurons work together to transfer autonomic, sensory, and motor impulses from the spinal cord to the body's other systems.
Each area is made up of many segments. Motor and sensory nerve fibers to and from every area of the body are found in the spinal nerve. A dermatome is innervated by each segment of the spinal cord. The spinal cord is organized into segments, each corresponding to specific regions of the body: 8 cervical (neck) 12 thoracic (chest) 5 lumbar ...
General somatic afferents conduct impulses of pain, touch and temperature from the surface of the body through the dorsal roots to the spinal cord, and impulses of muscle sense, tendon sense and joint sense from the deeper structures.
Somatic receptors in the skin, muscles and tendons; Afferent nerve fibers carry signals from the somatic receptors to the posterior horn of the spinal cord or to the brainstem; An integrating center, the point at which the neurons that compose the gray matter of the spinal cord or brainstem synapse; Efferent nerve fibers carry motor nerve ...
The lateral corticospinal tract is a descending motor pathway that begins in the cerebral cortex, decussates in the pyramids of the lower medulla [1] (also known as the medulla oblongata or the cervicomedullary junction, which is the most posterior division of the brain [2]) and proceeds down the contralateral side of the spinal cord.
In the spinal cord, sensory and motor signals are integrated and modulated by motor neuron pools called central pattern generators (CPGs). At the base level, sensory input is relayed by muscle spindles in the muscle and Golgi tendon organs (GTOs) in tendons, alongside cutaneous sensors in the skin.