The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have the patellar reflex, including dogs, cats, horses, and other mammalian species. See more Striking of the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the … See more Wilhelm Heinrich Erb (1840–1921) and Carl Friedrich Westphal (1833–1890) simultaneously reported the patellar tendon or knee reflex in 1875. The term knee-jerk was … See more • Tonic vibration reflex – Sustained contraction of vibrated muscle • Motor control – Regulation of movement within organisms possessing a nervous system • Jendrassik maneuver – Medical maneuver to test reflexes See more After the tap of a hammer, the leg is normally extended once and comes to rest. The absence or decrease of this reflex is problematic, and known as Westphal's sign. This reflex may be diminished or absent in lower motor neuron lesions and … See more The term began to be used figuratively from the early 20th century onwards. O. O. McIntyre, in his New York Day-By-Day column in The Coshocton Tribune, October 1921, wrote: "Itinerant preacher stemming Broadway on a soap box. And gets only an occasional knee … See more • Gurfinkel' VS, Lipshits MI, Popov KE (1974). "Is the stretch reflex a basic mechanism in the system of regulation of human vertical posture?". Biofizika (in Russian). 19 (4): 744–8. PMID 4425696. • Pinnock CA, Lin ES, Smith T (2003). "Physiology of the … See more WebIt has been noted that in patients who have undergone total knee arthroplasty (TKA), the PTR is diminished on the operative side compared with the contralateral nonoperative …
Areflexia Causes, Symptoms, and Treatment - WebMD
WebTendon reflexes are single synapse reflexes. A rapid stretch of the muscle stimulates the muscle spindles and this message is conveyed via the sensory root to the spinal cord at the segmental level of the muscle stimulated. This synapses with the motor neurone that supplies the muscle and leads to contraction of the muscle. WebFeb 6, 2024 · National Center for Biotechnology Information the role of cells
Lumbar Radiculopathy - Physiopedia
WebJan 6, 2024 · A unilateral diminished reflex suggests nerve root dysfunction. To support your suspicion of lumbar radiculopathy, abnormal reflex findings should be associated … WebWeakened quadriceps; diminished patellar or suprapatellar reflex: L3-4: Pain in posterolateral thigh and anterior tibial area: Weakened quadriceps; diminished patellar reflex: L4-5: track order lucy in the sky