Читать книгу Pathy's Principles and Practice of Geriatric Medicine - Группа авторов - Страница 162

By the age of 80, almost one‐third of healthy people have lost their ankle jerk reflexes.⁴⁸ Knee, triceps, and biceps jerks are mostly maintained. Older individuals can exhibit ‘primitive’ reflexes, a group of behavioural motor responses that are found in normal early development and are subsequently inhibited, but that may be released from inhibition during the ageing process and/or by cerebral damage.⁵⁰ They include the palmomental reflex (i.e. ipsilateral chin movement evoked by scratching the palm along the thenar eminence), snout reflex (i.e. lips pucker in response to gentle pressure over the nasal philtrum), sustained glabella reflex (i.e. continuous blinking reaction elicited by repetitive light tapping of the glabella with no habituation), and grasp reflex (i.e. handclasp in response to distal ascending pressure on the palm). The presence of primitive reflexes does not reflect specific neuropathological modifications and does not predict the trajectory of future decline (e.g. in cognition) over time.⁵¹