knee jerk reflex definition
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KNEE-JERK REFLEX • KNEE-JERK REFLEX (noun). The noun KNEE-JERK REFLEX has 1 sense: 1. a reflex extension of the leg resulting from a sharp tap on the patellar tendon. Familiarity information: KNEE-JERK REFLEX used as a noun is very rare.
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reflex 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.This causes the quadriceps muscle at the front of the thigh to contract and jerk the leg up. This reflex, or simple reflex arc, involves only two nerves and one synapse.ough reflex the sequence of events initiated by the sensitivity of the lining of the airways and mediated by the medulla as a consequence of impulses transmitted by the vagus nerve, resulting in coughing, i.e., the clearing of the passageways of foreign matter.
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- An action or movement not controlled by conscious thought. A reflex may be anything from a hiccup to the involuntary response of a body part, such as the action that occurs in the knee-jerk reflex.
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What is a Knee Jerk Reflex? The knee jerk reflex is when a tendon above the kneecap is tapped with a reflex hammer, which causes the whole leg to involuntarily jerk.
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- Define contralateral reflex. contralateral reflex synonyms, contralateral reflex pronunciation, contralateral reflex translation, English dictionary definition of contralateral reflex. adj. 1. Physiology Being an involuntary action or response, such as a sneeze, blink, or hiccup. 2. Produced as an automatic response or reaction: reflex...
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- A somatic reflex is part of the other branch of the peripheral nervous system that controls skeletal muscle movements, including the reflexes, like the knee jerk test that a doctor would give you. + 62 others found this useful. Stefanie Kenyon.
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- 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.This causes the quadriceps muscle at the front of the thigh to contract and jerk the leg up.eflex action. an involuntary response to a stimulus conveyed to the nervous system and reflected to the periphery (see also reflex). reflex bradycardia. bradycardia occurring as a reflex initiated by severe atrial or ventricular stretch.
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knee jerk knee jerk. You experience a knee jerk when your doctor taps your knee with a rubber mallet and your leg automatically kicks out. The idiom a knee jerk reaction means that you respond to something in an equally unthinking way. If you instinctively assume that someone who loves clowns wouldn't have much in common with you, that's a knee jerk, or automatic, reaction. This figurative meaning of knee jerk came from the physical reflex — which is called a patellar reflex by doctors, and which was discovered and named in the 1870's.
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Understanding the Stretch Reflex (or Myotatic Reflex) The stretch reflex; which is also often called the myotatic reflex, knee-jerk reflex, or deep tendon reflex, is a pre-programmed response by the body to a stretch stimulus in the muscle.nother example of the stretch reflex is the knee-jerk test performed by physicians. When the patellar tendon is tapped with a small hammer, or other device, it causes a slight stretch in the tendon, and consequently the quadriceps muscles.
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reflex The sensory side of the reflex arc conveys specificity as to which reflex will be activated. The remainder of the reflex response is governed by the specific synaptic connections that lead to the effector neurons. A familiar reflex is the knee-jerk or stretch reflex. It involves the patellar (kneecap) tendon and a group of upper leg muscles. Other muscle groups show similar reflexes.
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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. This causes the quadriceps muscle at the front of the thigh to contract and jerk the leg up.
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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.
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reflex A 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. tonic reflex. see tonic neck response. 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. tonic reflex.
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Tendon reflex Tendon reflex (or T-reflex) may refer to: 1  A stretch reflex, when the stretch is created by a blow upon a muscle tendon. 2  This is the usual definition of the term.3  A common example is the standard knee-jerk response when visiting the doctor. A stretch reflex, when the stretch is created by a blow upon a muscle tendon. 2  This is the usual definition of the term. 3  A common example is the standard knee-jerk response when visiting the doctor.
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Knee-jerk reflex Knee-jerk reflex, also called patellar reflex, sudden kicking movement of the lower leg in response to a sharp tap on the patellar tendon, which lies just below the kneecap. One of the several positions that a subject may take for the test is to sit with knees bent and with one leg crossed over the other so that the upper foot hangs clear of the floor.
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What is a Knee Jerk Reflex? The patellar tendon will move when pressure is put on it whether or not the patient wants it to. This is because the nerves there connect directly to the spinal cord rather than the brain. The knee jerk reflex test is therefore used to check for nerve damage in the nerve system as a whole. The different kinds of responses a medical professional will get when striking the patellar tendon can be graded.
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3 Subatomic Particles Atom is the smallest unit of matter. Matter can exist in physical three states, solid, liquid and gaseous state. The physical state of matter is classified on the basis of properties of particles. The particles of solid state have less energy with least intermolecular distance between them.
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Describe the reflex arc? The reflex arc is the nerve pathway that the signal follows. For example, the knee jerk reflex arc has a stimulus going to an interneuron in the spine and a motor neuron compl … etes the arc by causing the knee to jerk. A reflex is just the action itself.he somatic reflex arc is a neural circuit that travels through the spinal cord. It allows the body to respond to the stimulus before the brain interprets the message/ impulse … . For example, when you burn yourself, you automatically pull your hand away without even thinking about it.
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reflex 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.This causes the quadriceps muscle at the front of the thigh to contract and jerk the leg up.riceps surae reflex plantar flexion caused by a twitchlike contraction of the triceps surae muscle, elicited by a tap on the Achilles tendon, preferably while the patient kneels on a bed or chair, the feet hanging free over the edge.
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Understanding the Stretch Reflex (or Myotatic Reflex) Another example of the stretch reflex is the knee-jerk test performed by physicians. When the patellar tendon is tapped with a small hammer, or other device, it causes a slight stretch in the tendon, and consequently the quadriceps muscles.The result is a quick, although mild, contraction of the quadriceps muscles, resulting in a small kicking motion.he stretch reflex is very important in posture. It helps maintain proper posturing because a slight lean to either side causes a stretch in the spinal, hip and leg muscles to the other side, which is quickly countered by the stretch reflex. This is a constant process of adjusting and maintaining.
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- A reflex is an involuntary response to a stimuli Blinking, Gagging, and Coughing, are examples of reflexes. In Infants, there are reflexes called Moro, rooting, and sucking. Many of the reflexes of infants are lost as they grow older.eflexes follow a Reflex ARC. The Arc is through the spinal cord. While the information gets sent to the brain (you know you touched something hot, or you are choking and coughing), the reflex totally by-passes the brain.
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jaw jerk jaw jerk. Chin reflex. knee jerk. The extension of the lower leg upon striking the patellar tendon when the knee is flexed at a right angle. Knee jerk is absent in locomotor ataxia, infantile paralysis, meningitis, destructive lesions of the lower part of the spinal cord, and certain forms of paralysis.
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- The automatic response of a muscle to a stimulus is called a reflex. The patellar reflex. results from tapping the patellar tendon below the knee with a reflex hammer. This. causes contraction of the quadriceps muscle and extension of the leg. Stretching of the.
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reflex arc the nervous connections between RECEPTOR and EFFECTOR that result in a simple response being elicited by a specific stimulus (a reflex action), such as a knee jerk without the involvement of the brain. The receptor is excited by a stimulus which induces a nerve impulse in the DENDRITE of a sensory (afferent) NEURONE.
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Reflexes Reflexes, or reflex actions, are involuntary, almost instantaneous movements in response to a specific stimulus. Reflex arcs that contain only two neurons, a sensory and a motor neuron, are considered monosynaptic. Examples of monosynaptic reflex arcs in humans include the patellar reflex and the Achilles reflex.
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Infant reflexes Definition. A reflex is a muscle reaction that happens automatically in response to stimulation. Certain sensations or movements produce specific muscle responses.Primitive reflexes; Reflexes in infants; Tonic neck reflex; Galant reflex; Truncal incurvation; Rooting reflex; Parachute reflex; Grasp reflex.efinition. A reflex is a muscle reaction that happens automatically in response to stimulation. Certain sensations or movements produce specific muscle responses.