Document Detail

Stretching of the Mueller muscle results in involuntary contraction of the levator muscle.
MedLine Citation:
PMID:  11910319     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Since the levator muscle involuntarily and tonically contracts against the weight and elastic resistance of the upper eyelid to maintain an adequate visual field, a mechanoreceptor such as a muscle spindle or a periodontal mechanoreceptor is thought to be essential for its functioning. It was surmised that the Mueller muscle might act as a serial kind of muscle spindle of the levator muscle. METHODS: The response of the bilateral levator muscles evoked by stretching the Mueller muscle of each eyelid of 87 patients with dermatochalasis or aponeurotic blepharoptosis was electromyographically and photographically recorded. RESULTS: Stretching of the unilateral Mueller muscle evoked contraction of the ipsilateral levator muscle in 18 and of the bilateral levator muscle in 69 of the 87 patients. CONCLUSIONS: The Mueller muscle can be thought of as a large, serial kind of muscle spindle, so that stretching by voluntary phasic contraction of the levator muscle for initial eye opening may evoke an afferent impulse to the mesencephalic trigeminal nucleus. Subsequently, this nucleus may stimulate the central caudal nucleus of the oculomotor nuclear complex, leading to involuntary tonic contraction of the ipsilateral or bilateral levator muscles, in the form of a continuous stretch reflex, to maintain an adequate visual field.
Kiyoshi Matsuo
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ophthalmic plastic and reconstructive surgery     Volume:  18     ISSN:  0740-9303     ISO Abbreviation:  Ophthal Plast Reconstr Surg     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-03-29     Completed Date:  2002-09-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8508431     Medline TA:  Ophthal Plast Reconstr Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5-10     Citation Subset:  IM    
Department of Plastic and Reconstructive Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
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MeSH Terms
Blepharoplasty / methods*
Blepharoptosis / physiopathology,  surgery*
Cutis Laxa / physiopathology,  surgery*
Eyelids / physiopathology,  surgery*
Muscle Contraction / physiology*
Muscle Spindles / physiology
Neurons, Afferent / physiology
Oculomotor Muscles / innervation,  physiopathology,  surgery*

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