HISTOLOGICALSTRUCTURE
组织学结构
ThewordmuscleisderivedfromtheLatinmus(=mouse)andreferstotheresemblanceofthemusclebellytoamouse.Musclesvaryinsize,shapeandform,accordingtotheirfunction.Forexample,thebicepsisafusiformmuscleinwhichthefibresareallarrangedinparallelforquickactivity.Thedeltoidisapenniform,feather-shapedmusclewithaseptumatanangletothelineofactionwhichallowsformaximumstrength.Eachmuscleisenclosedinaconnectivetissuesheath,theepimysium,