GENERAL HISTOLOGY

Detailed explanation-1: -an abnormal patellar reflex observed in patients with a lesion of the cerebellum, in which the leg continues to move several times after the initial reflex.

Detailed explanation-2: -The knee jerk reflex is mediated by the L3 and L4 nerve roots, mainly L4. Insult to the cerebellum may lead to pendular reflexes. Pendular reflexes are not brisk but involve less damping of the limb movement than is usually observed when a deep tendon reflex is elicited.

Detailed explanation-3: -Hypotonia. “Pendular” knee jerk, leg keeps swinging after knee jerk more than 4 times (4 or less is normal).

Detailed explanation-4: -Pendular reflexes are best observed when the patient’s lower legs are allowed to hang and swing freelly off the end of an examining table. Pendular reflexes are not brisk but they involve less damping of the limb movement than is usually observed when a deep tendon reflex is elicited.