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Ankle jerk reflex information


The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsiflexed. It is a type of stretch reflex that tests the function of the gastrocnemius muscle and the nerve that supplies it. A positive result would be the jerking of the foot towards its plantar surface. Being a deep tendon reflex, it is monosynaptic. It is also a stretch reflex. These are monosynaptic spinal segmental reflexes. When they are intact, integrity of the following is confirmed: cutaneous innervation, motor supply, and cortical input to the corresponding spinal segment.

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Ankle jerk reflex

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The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsiflexed. It is a type of stretch...

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List of reflexes

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Ankle jerk reflexjerking of the ankle when the Achilles tendon is hit with a tendon hammer while the foot is relaxed, stimulating the S1 reflex arc...

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Startle response

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of the startle response is a startle reflex reaction. The startle reflex is a brainstem reflectory reaction (reflex) that serves to protect vulnerable parts...

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Reflex

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digitorum reflex (C6, C7) Triceps reflex (C6, C7, C8) Patellar reflex or knee-jerk reflex (L2, L3, L4) Ankle jerk reflex (Achilles reflex) (S1, S2) While...

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Stretch reflex

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reflex C6/C7 Triceps reflex C7/C8 Patellar reflex L2-L4 (knee-jerk) Ankle jerk reflex S1/S2 Another example is the group of sensory fibers in the calf...

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Peripheral neuropathy

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Classically, ankle jerk reflex is absent in peripheral neuropathy. A physical examination will involve testing the deep ankle reflex as well as examining...

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Hypothyroidism

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mistaken for those of menopause. Delayed relaxation after testing the ankle jerk reflex is a characteristic sign of hypothyroidism and is associated with...

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Cutaneous reflex in human locomotion

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in the polysynaptic reflex, which involves more than one synapse. The knee jerk reflex is a common example of a monosynaptic reflex when one is looking...

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Woltman sign

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sign is named for Henry Woltman, an American neurologist. The delayed ankle jerks are associated with: hypothyroidism; Huntington's disease; several neurological...

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Spasticity

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reflexes (muscle tone) with exaggerated tendon jerks, resulting from hyper-excitability of the stretch reflex as one component of the upper motor neurone...

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Mechanoreceptor

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pulmonary emboli, pneumonia, and barotrauma. The knee jerk is the popularly known stretch reflex (involuntary kick of the lower leg) induced by tapping...

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Neurological examination

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reflexes Reflexes: masseter, biceps and triceps tendon, knee tendon, ankle jerk and plantar (i.e., Babinski sign). Globally, brisk reflexes suggest an...

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Index of anatomy articles

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angiography angiology angular gyrus anhidrosis animal morphology anisocoria ankle ankle reflex annular ligament annulus of Zinn anomaly anomic aphasia anosognosia...

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Massage

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reflex (H-reflex) amplitude. A decrease in peak-to-peak H-reflex amplitude suggests a decrease in motoneuron excitability. Others explain, "H-reflex is...

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Heart

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parasympathetic stimulation. There is a similar reflex, called the atrial reflex or Bainbridge reflex, associated with varying rates of blood flow to...

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Human physiology of underwater diving

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water can result in the harmful cold shock response, the helpful diving reflex and excessive loss of body heat. Breath-hold duration is limited by oxygen...

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Tremie

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be used to control setting time, slump and workability. Vibration and jerking of the pipe may be applied to encourage slumping and levelling of the upper...

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Tom Simpson

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up in the air there was panic and crashes. It was Simpson acting like a jerk. It didn't happen often. Occasionally I was angry at him. I’d say to him...

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Oxygen toxicity

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spasms of alternate muscle relaxation and contraction producing convulsive jerking (clonic phase). The seizure ends with a period of unconsciousness (the...

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Deep diving

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on by breathing helium under extreme pressure causes tremors, myoclonic jerking, somnolence, EEG changes, visual disturbance, nausea, dizziness, and decreased...

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Diving shot

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waves will cause the buoy and the top end of the line to bob up and down, jerking on the line. A bottom tensioned shotline controls the tension of the line...

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Maximum operating depth

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spasms of alternate muscle relaxation and contraction producing convulsive jerking (clonic phase). The seizure ends with a period of unconsciousness (the...

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Diver communications

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not used as a diving signal as it is difficult to distinguish it from a jerk caused by temporarily snagging the line. Attendant to diver: General signals:...

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Ian Meckiff

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behind square from the bowling of his fellow left-armer, who called the reflex catches "absolutely unbelievable". Meckiff described the hometown atmosphere...

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Diving disorders

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descent and the depth. The effects of HPNS comprise trembling, myoclonic jerks, drowsiness, alterations in EEG patterns, visual disruptions, queasiness...

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