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Webinar - Lower Limb Reflexes and Upper Motor Neuron Lesion (Part 2)

Duration: 34:52

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Feb 12 2023, 5:38 pm

Dr. Been, This is Very informative lesson! I just passed my FNP boards and am about to start my practice as an NP in a Neurology Office , is there a book or an app that you'd recommend for me to use for a beginner? Of course I am using your videos etc as well . I'd really appreciate it .Thank you . Phil



May 04 2020, 4:29 pm

Would you please explain why corticospinal lesions lead to spasticity while extrapyramidal lesions lead to rigidity?

Nervous system examination is crucial to identifying the type of lesion, its location, and its extent. Lower limb reflexes are an important part of this examination especially in a patient in coma. Dr. Mobeen discusses the foundations of lower limb examination in this webinar. Next part will present the clinical utility and lesion assessment based on the abnormal reflexes e.g. positive Babinski's sign (plantar reflex), or hyperreflexia vs. hyporeflexia etc.


This second part of the webinar discusses the following topics:

  • Cause of hyperreflexia in a patient of upper motor neuron lesion.
  • Cause of hypertonia in a patient of upper motor neuron lesion.
  • Dysinhibition of the lower centers.
  • Clonus
  • When does atonia and flacidity occur?
  • When will we see fasciculation and twitching in the muscle?
  • When will we see muscle wasting?
  • Denervation degeneration.
  • Difference between the lower motor and upper motor neuron lesion.
  • What is plantar reflex or babinski's sign?
  • Role of the S1 spinal segment in plantar reflex.
  • What does involvement of the L4 and L5 spinal segments do to plantar reflex?
  • When is Babinski's sign is positive?
  • What is tripe reflex in the lower limb?
  • What does involvement of the L2 and L3 spinal segments do to the plantar reflex?


Following topics are discussed in the previous part:

  • Neurology examination. How to differentiate between upper and lower motor neuron lesions?
  • What is the difference between an upper motor neuron and a lower motor neuron?
  • Overview of the corticospinal tract or pyramidal tract.
  • What are spinal reflexes?
  • What is a reflex arc?
  • Components of a reflex arc.
  • What is the role of the upper motor neurons in the spinal reflexes?




* Understand upper motor neuron impact on spinal reflexes.

* Differentiate upper and lower motor neuron lesions based on clinical signs.

* Recognize Babinski's sign significance in neurological assessment.

* Explain the Plantar reflex and its changes in neurological disorders.

*Identify the Triple reflex and its association with pain.

* Interpret reflex abnormalities to determine neurological involvement.

Following answers are created by ChatGPT. Occasionally the answer may be harmful, incorrect, false, misleading, incomplete, or limited in knowledge of world. Please contact your doctor for all healthcare decisions. Also, double check the answer provided by the AI below.


In addition to the presenter, following authors may have helped with the content writing, review, or approval:

  • Dr. Mobeen Syed

CME, CE, CEU and Other Credit Types:

ACCME Accreditation Statement
The DrBeen Corp is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.

AMA Credit Designation Statement
The DrBeen Corp designates this enduring material for a maximum of 0.75 AMA PRA Category 1 Credits™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.

Disclosure Information

In accordance with the disclosure policies of DrBeen Corp and the ACCME (Accreditation Council for Continuing Medical Education), we are committed to upholding principles of balance, independence, objectivity, and scientific rigor in all of our Continuing Medical Education (CME) and Continuing Education (CE) activities. These policies include the careful management and mitigation of any relevant financial relationships with organizations that are not eligible.
All members of the Activity Planning Committee and presenters have disclosed their relevant financial relationships. The DrBeen Corp CE Committee has thoroughly reviewed these disclosures and determined that these relationships are not deemed inappropriate in the context of their respective presentations. Additionally, they are found to be consistent with the educational objectives and the integrity of the activity.

Faculty Disclosures
Dr. Mobeen Syed Author declares no conflict of interest.

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Nervous System

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