spinal reflex definition
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What is a Spinal Reflex? A spinal reflex is a reflexive action mediated by cells in the spinal cord, bypassing the brain altogether. A classic example is the kneejerk or patellar reflex, where the leg jerks when the kneecap is struck with a brisk tap. spinal reflex will bypass the brain and is an action only by the cells in the spinal cord.
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Spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body.he coccygeal nerve is the 31st pair of spinal nerves. It arises from the conus medullaris, and its anterior root helps form the coccygeal plexus. It does not divide into a medial and lateral branch. It is distributed to the skin over the back of the coccyx.
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Spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column.
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spinal [spi´nal] 1. pertaining to a spine. 2. pertaining to the vertebral column. spinal cord that part of the central nervous system lodged in the spinal canal, extending from the foramen magnum to the upper part of the lumbar region. It is composed of an inner core of gray substance in which nerve cells predominate and an outer layer of white substance in which myelinated nerve fibers predominate.
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- spinal tract. any one of the ascending (sensory) and descending (motor) pathways for sensory or motor nerve impulses that is found in the white matter of the spinal cord. Twenty-one different tracts lie within the dorsal, ventral, and lateral funiculi of the white substance.
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reflex a reflected action or movement; the sum total of any particular automatic response mediated by the nervous system. A reflex is built into the nervous system and does not need the intervention of conscious thought to take effect. The knee jerk is an example of the simplest type of reflex. When the knee is tapped, the nerve that receives this stimulus sends an impulse to the spinal cord, where it is relayed to a motor nerve.
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Medical Definition of Babinski reflex A Babinski reflex in an older child or an adult is abnormal and is a sign of a problem in the brain or spinal cord. A Babinski reflex that is present on one side but not the other is also abnormal, and it can indicate which side of the brain is involved. Also known as plantar response, big toe sign, and Babinski phenomenon, response, or sign.
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reflex Definition of REFLEX for Kids. 1. : an action or movement that is made automatically without thinking as a reaction to a stimulus.2. an action or movement of the body that happens automatically as a reaction to something. : something that you do without thinking as a reaction to something.
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- Human Reflexes. Purpose: This exercise is designed to familiarize the student with spinal and cranial nerve reflexes. Performance Objectives: At the end of this exercise the student should be able to: 1. Define the terms reflex and reflex arc.2.he calcaneal reflex or Achilles or ankle-jerk reflex is a stretch reflex that assesses the nervous tissue between (and including) the first two sacral segments. It can be elicited by sharply tapping the calcaneal tendon (just above the ankle) with the base of a Taylor hammer.
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reflex a reflected action or movement; the sum total of any particular automatic response mediated by the nervous system. A reflex is built into the nervous system and does not need the intervention of conscious thought to take effect. The knee jerk is an example of the simplest type of reflex.
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Positive Health Online Reflexes are ultimately responsible for the action of our muscles and, so, govern the way we move. Reflexes are, by definition, actions that occur before the brain is aware of what is happening. Reaction to a stimulus is processed in the spinal cord, bypassing brain control.
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reflex [re´fleks] a reflected action or movement; the sum total of any particular automatic response mediated by the nervous system. A reflex is built into the nervous system and does not need the intervention of conscious thought to take effect. The knee jerk is an example of the simplest type of reflex. When the knee is tapped, the nerve that receives this stimulus sends an impulse to the spinal cord, where it is relayed to a motor nerve.
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- A reflex action, differently known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus.Scientific use of the term reflex refers to a behavior that is mediated via the reflex arc; this does not apply to casual uses of the term reflex.any of these reflexes are quite complex requiring a number of synapses in a number of different nuclei in the CNS (e.g., the escape reflex). Others of these involve just a couple of synapses to function (e.g., the withdrawal reflex).
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- A reflex is an involuntary (say: in-VAHL-un-ter-ee), or automatic, action that your body does in response to something — without you even having to think about it. You don't decide to kick your leg, it just kicks. There are many types of reflexes and every healthy person has them. In fact, we're born with most of them.
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Spinal Reflex a reflex whose center is located in the spinal cord. There are four types of spinal reflexes: somatic (motor), autonomic, segmental, and intersegmental.egmental spinal reflexes occur within a single segment of the spinal cord, and intersegmental spinal reflexes enter and emerge from different spinal segments. Depending on the structure of the reflex arcs, spinal reflexes may be monosynaptic or polysynaptic.
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reflex Reflex. A simple, unlearned, yet specific behavioral response to a specific stimulus. Reflexes are exhibited by virtually all animals from protozoa to primates. Along with other, more complex stimulus-bound responses such as fixed action patterns, they constitute much of the behavioral repertoire of invertebrates.
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reflex Definition of reflex for Students. 1  1 : an action or movement that is made automatically without thinking as a reaction to a stimulus. 2  2 reflexes plural : the natural ability to react quickly A driver needs good reflexes.
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reflex noun (ˈriːflɛks) 1. 1  an immediate involuntary response, esp one that is innate, such as coughing or removal of the hand from a hot surface, evoked by a given stimulus. ( as modifier): a reflex action See also reflex arc.
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- • BABINSKI REFLEX (noun). The noun BABINSKI REFLEX has 1 sense: 1. extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons. BABINSKI REFLEX (noun). The noun BABINSKI REFLEX has 1 sense: 1. extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons.
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Reflex Tests Reflex tests are performed as part of a neurological exam, either a mini-exam done to quickly confirm integrity of the spinal cord, or a more complete exam performed to diagnose the presence and location of spinal cord injury or neuromuscular disease. Deep tendon reflexes are responses to muscle stretch.
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- A reflex is an automatic response to a stimulus. Humans use reflex  actions in only some of their behaviour, for example controlling  the eye's pupil size. Simple reflexes. … Simple reflexes produce  rapid involuntary responses to a stimulus. reflex is a quick involuntary action. There are five steps to a reflex: the stimulus occurs, the sensory neurons sense the stimulus, it sends a message to your spinal cord (… it doesn't reach the brain right then), the spinal cord sends a message to your motor neurons, and the reflex occurs.
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Spinal Nerves Overview of Spinal Nerves. Spinal nerves, a part of the PNS, generally refers to mixed nerves, with motor, sensory, and. autonomic signals between the CNS and the body. 1. fig. 1 shows a spinal nerve. Spinal nerves arise from a combination of nerve fibers: the dorsal and ventral roots of the spinal. cord.
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reflex reflex. a reflected involuntary action or movement; the sum total of any particular automatic response mediated by the nervous system. A reflex is built into the nervous system and does not need the intervention of conscious thought to take effect. positive reaction is a sharp contraction of the muscle of which the tendon is part. The patellar reflex is the best known of these reflexes. Absence indicates a defect in the reflex arc, an exaggerated response suggests an upper motor neuron lesion. Called also myotactic reflex.
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Medical Definition of Spinal cord home / medterms medical dictionary a-z list / spinal cord definition Medical Definition of Spinal cord Spinal cord: The major column of nerve tissue that is connected to the brain and lies within the vertebral canal and from which the spinal nerves emerge. Thirty-one pairs of spinal nerves originate in the spinal cord: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. The spinal cord and the brain constitute the central nervous system. The spinal cord consists of nerve fibers that transmit impulses to and from the brain. Like the brain, the spinal cord is covered by three connective-tissue envelopes called the meninges.
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H-reflex The H-reflex (or Hoffmann's reflex) is a reflectory reaction of muscles after electrical stimulation of sensory fibers (Ia afferents stemming from muscle spindles) in their innervating nerves (for example, those located behind the knee).
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Stretch reflex Spinal reflexes include the stretch reflex, the Golgi tendon reflex, the crossed extensor reflex, and the withdrawal reflex. Stretch Reflex. The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. This reflex has the shortest latency of all spinal reflexes.