perimysium

noun

peri·​my·​si·​um ˌper-ə-ˈmi-zhē-əm 

-zē-

plural perimysia ˌper-ə-ˈmi-zhē-ə 

-zē-

: the connective-tissue sheath that surrounds a muscle and forms sheaths for the bundles of muscle fibers

Examples of perimysium in a Sentence

Recent Examples on the Web

Muscle fibers are surrounded by networks of fat and connective tissue (endomysium, perimysium, and epimysium). —Ashton Yoon, Discover Magazine, 30 Aug. 2016

Word History

Etymology

borrowed from New Latin (in German context), from peri- peri- + Greek my-, mŷs "mouse, muscle" + New Latin -ium -ium, after periosteum periosteum and perichondrium perichondrium — more at mouse entry 1

Note: The term was introduced by the German physician and anatomist Johann Christian August Clarus (1774-1854) in Annalen des königlichen klinischen Instituts am St. Jakobshospital in Leipzig, 1. Band, 2 Abteilung, Nr. 3 (see Leipziger Literatur-Zeitung, Nr. 300, am 1. Dezember, 1812, p. 2399). Note that the combinatory form of mŷs should be my- rather than mys-.

First Known Use

circa 1842, in the meaning defined above

Medical Definition

perimysium

noun

peri·​my·​si·​um ˌper-ə-ˈmiz(h)-ē-əm 

plural perimysia -ē-ə 

: the connective-tissue sheath that surrounds a muscle and forms sheaths for the bundles of muscle fibers