Human Movement Science & Functional Anatomy of the:

Deltoids

by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

"Deltoid muscle top10" by Anatomography - en:Anatomography (setting page of this image). Licensed under CC BY-SA 2.1 jp via Commons - https://commons.wikimedia.org/wiki/File:Deltoid_muscle_top10.png#/media/File:Deltoid_muscle_top10.png "Deltoid muscle top10" by Anatomography - en:Anatomography (setting page of this image). Licensed under CC BY-SA 2.1 jp via Commons - https://commons.wikimedia.org/wiki/File:Deltoid_muscle_top10.png#/media/File:Deltoid_muscle_top10.png

What's in a name:

The deltoid is commonly divided into 3 parts based on function, fiber arrangement, neural innervation, and separation at the proximal attachment. The 3 divisions are:

  • Anterior Deltoid
  • Middle Deltoid (There is no such thing as a "medial" deltoid)
  • Posterior Deltoid

  • anterior (adj.) 1610s, Latin, literally "former," comparative of ante "before" (see ante). Related: Anteriority. (Etymology Online)
  • mid (prep., adj.) Old English mid "with, in conjunction with, in company with, together with, among," from Proto-Germanic *medjaz (cognates: Old Norse miðr, Old Saxon middi, Old Frisian midde, Old High German mitti, Gothic midjis "mid, middle"), from PIE *medhyo- "middle" (see medial (adj.)). Now surviving in English only as a prefix (mid-air, midstream, etc.); as a preposition it often is a shortened form of amid (compare midshipman). (Etymology Online)
  • posterior (adj.) 1530s, "later," from Latin posterior "after, later, behind," comparative of posterus "coming after, subsequent," from post "after" (see post-). Meaning "situated behind" is from 1630s. (Etymology Online)

 

"Deltoideus posterior" by User:Mikael Häggström - Image:Gray409.png. Licensed under Public Domain via Commons - https://commons.wikimedia.org/wiki/File:Deltoideus_posterior.PNG#/media/File:Deltoideus_posterior.PNG "Deltoideus posterior" by User:Mikael Häggström - Image:Gray409.png. Licensed