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The present review focusses on the morphological characteristics of the normal human ciliary muscle. It develops in the second and third trimenon during pregnancy but continues to change after birth with developing accommodation. The mature muscle forms three distinguishable portions which are connected but show individual characteristics. The outer portion origins and inserts with tendon-like structures, while the inner portion forms a sphincter-like appearance. The distinct different innervation is not yet completely described, nor exist portion-dependent summaries of the cytological characteristics. The specific intracellular, membraneous, and extracellular components described in the literature are listed and supplemented with own observations.
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Christian Albrecht May (2017) studied this question.
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