Cranial Nerve Exam: Normal Exam: Cranial Nerve 5 - Motor
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The motor division of CN 5 supplies the muscles of mastication (temporalis, masseters, and pterygoids). Palate the temporalis and masseter muscles as the patient bites down hard. Then have the patient open their month and resist the examiner's attempt to close the month. If there is weakness of the pterygoids the jaw will deviate towards the side of the weakness. The last test for this nerve is testing for a jaw jerk, which is a stretch reflex. Have the patient slightly open their month then place your finger on their chin and strike your finger with a reflex hammer. Normally there is no movement. If there is a jaw jerk it is said to be positive and this indicates an upper motor neuron lesion.
From the NeuroLogic Exam: An Anatomical Approach collection of the Health Education Assets Library (HEAL) http://www.healcentral.org.
Copyright The University of Utah 2001; Updated Jan 2004; Updated June 2004; Updated July 2005.
The videos are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License (http://creativecommons.org/licenses/by-nc-nd/2.5/).The motor division of CN 5 supplies the muscles of mastication (temporalis, masseters, and pterygoids). Palate the temporalis and masseter m...all »The motor division of CN 5 supplies the muscles of mastication (temporalis, masseters, and pterygoids). Palate the temporalis and masseter muscles as the patient bites down hard. Then have the patient open their month and resist the examiner's attempt to close the month. If there is weakness of the pterygoids the jaw will deviate towards the side of the weakness. The last test for this nerve is testing for a jaw jerk, which is a stretch reflex. Have the patient slightly open their month then place your finger on their chin and strike your finger with a reflex hammer. Normally there is no movement. If there is a jaw jerk it is said to be positive and this indicates an upper motor neuron lesion.
From the NeuroLogic Exam: An Anatomical Approach collection of the Health Education Assets Library (HEAL) http://www.healcentral.org.
Copyright The University of Utah 2001; Updated Jan 2004; Updated June 2004; Updated July 2005.
The videos are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License (http://creativecommons.org/licenses/by-nc-nd/2.5/).«
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