Where does the Reticulospinal tract end?

Article by: Dr. Sonia Patiño | Last update: April 10, 2022
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Ends in Neurons of lamina VII and VIII of Rexed. Participates in the control of the position of the head. Its function is to stimulate the Flexor Motor Neurons and inhibit the Extensor Motor Neurons. It originates from the medial group of pontine reticular nuclei.

Where does the corticospinal tract end?

Most of the fibers of the corticospinal tract end in the interneurons between the ventral and dorsal horns. Most originate in the motor and premotor areas; and end in interneurons, between the ventral and dorsal horns (alpha motor neurons).

What is the Reticulospinal Tract?

Reticulospinal tracts

The pontine reticulospinal tract originates from the pontine reticular formation and is maintained ipsilaterally through the medial longitudinal fasciculus and anterior funiculus of the spinal cord, exiting ipsilaterally at all spinal levels.

Where does the corticospinal tract decussate?

Most of them decussate back and forth in the lower brainstem and descend in the contralateral white matter of the cord, in what is called the lateral corticospinal pathway. About 15% of the axons do not make the pyramidal decussation and descend as the ventral corticospinal tract.

Where is the rubrospinal tract located?

Rubrospinal tract, they leave the red nucleus in the midbrain then reach the extremities and the trunk. Tectospinal tract, originates in the same superior colliculus of the midbrain until reaching the eyes, head and neck.

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What does the rubrospinal tract control?

Its function is: Maintain balance, posture and balance while performing voluntary movements. It also controls associated or involuntary movements. Therefore, this system has as its function the automatic control of muscle tone and associated movements that accompany voluntary movements.

What information does the rubrospinal tract carry?

The rubrospinal tract or the rubrospinal bundle are a set of fibers that originate in the mesencephalic red nucleus that decussate and descend through the spinal cord until they reach the anterior (ventral) horn of the spinal cord. When they reach the effectors, they stimulate flexor movements and inhibit extensor activity.

Where do we find the pyramidal decussation?

The pyramidal pathway (A in the diagram) originates in the motor area of ​​the cerebral cortex, located in front of the central or Rolando sulcus. As the axons descend, they cross to the contralateral side at the height of a structure, the decussation or intersection of the pyramids, which is located at the height of the medulla oblongata.

What is the function of the reticular system?

Other functions of the reticular formation are: to act by inhibiting or facilitating some cortical functions (when one is concentrated, their memory capacity increases) and to inhibit or facilitate movements (it is responsible for the increase or decrease of muscle tone).

What is the function of the extrapyramidal system?

In human anatomy, the extrapyramidal system is a neural network that is part of the central nervous system and is part of the motor system, related to the coordination of movement. It is made up of the polysynaptic nerve pathways that include the basal ganglia and the subcortical ganglia.

What does the motor cortex control?

The motor cortex comprises the areas of the cerebral cortex responsible for the planning, control and execution processes of voluntary motor functions.

Where does the extrapyramidal pathway or system begin and end?

It runs through the entire spinal cord, up to its ventral point, where it synapses with motor neurons involved in flexion movements. It is a pathway that is related to the coordination of flexor movements, which inhibits extensor movements.

What is the function of the limbic system?

The brain’s limbic system consists of a group of structures that direct emotions and behavior.

What is the function of the spinal cord?

The spinal cord connects the brain with nerves throughout most of the body. This allows the brain to send messages to the rest of the body. The network made up of the brain and spinal cord is called the central nervous system (CNS).

How does the ascending reticular activating system work?

The ascending reticular activating system is responsible for the physiological changes from a state of deep sleep to one of wakefulness, transitions that are reversible and necessary for the organism. The ventrolateral preoptic nucleus of the hypothalamus inhibits neural circuits responsible for wakefulness.

What is decussation and where does it happen?

In the brain, where the nerve fibers cross obliquely from one side to the other, that is, they cross at a level other than their origin. See, for example, the decussation of the pyramids. In phyllotaxis, when an opposing pattern of leaves has successive pairs that are perpendicular, it is said to be decussate.

Where do the sensory pathways decussate?

The Medial Leminiscus originates from the sensory decussation, which reaches the thalamus and synapses with the 3rd neuron of the posterolateral ventral nucleus. From here the corresponding thalamic radiations are projected through the internal capsule, ending in the somesthetic area of ​​the cerebral cortex.

What is the pyramidal and extrapyramidal system?

Pyramidal System: Voluntary motor pathway. Extrapyramidal System: Motor pathway of associated and semi-voluntary movements. They are those areas of the Nervous System that are primarily responsible for the control of movement.

What is the medulla oblongata of the brain?

The medulla oblongata is a switching station between the brain and spinal cord and contains the centers for the regulation of respiratory, vasomotor, cardiac, and reflex activities. Lower part of the BRAIN STEM. It is located under the BRIDGE and is anterior to the CEREBELLUM.

What is the red core?

The red nucleus is a structure located in the rostral part of the midbrain and is related to motor coordination. It has two parts, a lower magnocellular and a higher parvocellular. It is found dorsal to the substantia nigra, both structures forming part of the basal nuclei.

What is the function of the primary motor cortex?

The Primary Motor Cortex (or M1) is a brain region that in humans is located at the back of the frontal lobe. It works together with the premotor areas to plan and execute movements.

What is the motor activity?

Voluntary motor activity begins in neurons found in the cerebral cortex whose axons descend to the spinal cord where they activate the motor neurons that innervate skeletal muscles. This type of activity is planned to achieve certain objectives.

How is control of the axial and distal muscles given?


Within the brainstem and spinal cord, the pathways and neurons that control the skeletal muscles of the trunk and proximal limbs are located medially or ventrally.

What is the limbic system and its PDF function?

The limbic system is the basis of the emotional brain (Moore, 1982) participating in the processes involved in memory, motivation and monitoring, mediation and emotional expression, as well as in sexual and social behavior.

What is the function of the nervous system?

The nervous system controls everything you do; for example, breathing, walking, what you think and what you feel. This system is made up of the brain, spinal cord, and all the nerves in the body. The brain is the control center and the spinal cord is the main highway that connects to it.

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