Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications

SUMMARY: The purpose of this study was to reveal the overall distribution pattern of the intramuscular nerves of each extraocular muscle and provide morphological guidance for the selection of the neuromuscular compartment during extraocular muscle transplantation and target localization of the botu...

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Autores principales:	Zhou,Guoyan, Zhou,Jiayu, Wang,Danli, Yang,Shengbo
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2021
Materias:	Extraocular muscles Intramuscular nerve Distribution pattern Neuromuscular compartment Strabismus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000501412
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spelling	oai:scielo:S0717-950220210005014122021-10-19Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical ImplicationsZhou,GuoyanZhou,JiayuWang,DanliYang,Shengbo Extraocular muscles Intramuscular nerve Distribution pattern Neuromuscular compartment Strabismus SUMMARY: The purpose of this study was to reveal the overall distribution pattern of the intramuscular nerves of each extraocular muscle and provide morphological guidance for the selection of the neuromuscular compartment during extraocular muscle transplantation and target localization of the botulinum toxin A injection to correct strabismus. We studied 12 Chinese head specimens that were fixed with formalin. The extraocular muscles from both sides of each head were removed, and a modified Sihler’s staining technique was used to reveal the overall distribution pattern of the intramuscular nerves. We observed an intramuscular nerve-dense region formed by the intramuscular arborized branches in the semitransparent superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, inferior oblique, and levator palpebrae superioris muscles with Sihler's staining technique. The seven extraocular muscles can each be divided into two neuromuscular compartments. The intramuscular nerve-dense regions of the superior, inferior, medial, and lateral rectus and the superior oblique, inferior oblique, and levator palpebrae superioris muscles were positioned at 33.50 % -72.72 %, 40.21 % - 66.79%, 37.92 % - 64.51 %, 31.69 % - 56.01 %, 26.35 % - 64.98 %, 40.46 % - 73.20 %, and 27.72 % - 66.07 % of the lengths of the muscle bellies, respectively, and the centers of intramuscular nerve dense regions were located at 59.50 %, 54.18 %, 51.68 %, 50.08 %, 48.38 %, 56.49 %, and 50.77 % of the length of each muscle belly, respectively. The aforementioned values are the means of the actual values. These results suggest that when the strabismus is corrected with muscle transplantation, the extraocular muscle should be transplanted based on the neuromuscular compartment, which would benefit the function of both donor and recipient muscles. The localization of these nerve dense regions is recommended as an optimal target for the injection of botulinum toxin A to treat strabismus.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.39 n.5 20212021-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000501412en10.4067/S0717-95022021000501412
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Extraocular muscles Intramuscular nerve Distribution pattern Neuromuscular compartment Strabismus
spellingShingle	Extraocular muscles Intramuscular nerve Distribution pattern Neuromuscular compartment Strabismus Zhou,Guoyan Zhou,Jiayu Wang,Danli Yang,Shengbo Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
description	SUMMARY: The purpose of this study was to reveal the overall distribution pattern of the intramuscular nerves of each extraocular muscle and provide morphological guidance for the selection of the neuromuscular compartment during extraocular muscle transplantation and target localization of the botulinum toxin A injection to correct strabismus. We studied 12 Chinese head specimens that were fixed with formalin. The extraocular muscles from both sides of each head were removed, and a modified Sihler’s staining technique was used to reveal the overall distribution pattern of the intramuscular nerves. We observed an intramuscular nerve-dense region formed by the intramuscular arborized branches in the semitransparent superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, inferior oblique, and levator palpebrae superioris muscles with Sihler's staining technique. The seven extraocular muscles can each be divided into two neuromuscular compartments. The intramuscular nerve-dense regions of the superior, inferior, medial, and lateral rectus and the superior oblique, inferior oblique, and levator palpebrae superioris muscles were positioned at 33.50 % -72.72 %, 40.21 % - 66.79%, 37.92 % - 64.51 %, 31.69 % - 56.01 %, 26.35 % - 64.98 %, 40.46 % - 73.20 %, and 27.72 % - 66.07 % of the lengths of the muscle bellies, respectively, and the centers of intramuscular nerve dense regions were located at 59.50 %, 54.18 %, 51.68 %, 50.08 %, 48.38 %, 56.49 %, and 50.77 % of the length of each muscle belly, respectively. The aforementioned values are the means of the actual values. These results suggest that when the strabismus is corrected with muscle transplantation, the extraocular muscle should be transplanted based on the neuromuscular compartment, which would benefit the function of both donor and recipient muscles. The localization of these nerve dense regions is recommended as an optimal target for the injection of botulinum toxin A to treat strabismus.
author	Zhou,Guoyan Zhou,Jiayu Wang,Danli Yang,Shengbo
author_facet	Zhou,Guoyan Zhou,Jiayu Wang,Danli Yang,Shengbo
author_sort	Zhou,Guoyan
title	Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
title_short	Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
title_full	Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
title_fullStr	Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
title_full_unstemmed	Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications
title_sort	overall distribution pattern of the intramuscular nerves of the extraocular muscles and its clinical implications
publisher	Sociedad Chilena de Anatomía
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000501412
work_keys_str_mv	AT zhouguoyan overalldistributionpatternoftheintramuscularnervesoftheextraocularmusclesanditsclinicalimplications AT zhoujiayu overalldistributionpatternoftheintramuscularnervesoftheextraocularmusclesanditsclinicalimplications AT wangdanli overalldistributionpatternoftheintramuscularnervesoftheextraocularmusclesanditsclinicalimplications AT yangshengbo overalldistributionpatternoftheintramuscularnervesoftheextraocularmusclesanditsclinicalimplications
_version_	1718445217256833024

Overall Distribution Pattern of the Intramuscular Nerves of the Extraocular Muscles and its Clinical Implications

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