Integrated Functional Anatomy of the:

Sternoclavicular (SC), Acromioclavicular (AC) & Scapulothoracic (ST) Joints

by Jinny McGivern PT, DPT, CFMT, Certified Yoga Instructor& Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, H/FS

Computer generated illustration of a clavicle

What's in a name

  • Sternum (n): ""breastbone," 1660s, from Greek sternon "chest, breast, breastbone" (in Homer, only of males), also "the breast as the seat of affections," related to stornynai "to spread out," from PIE *ster-no- "to stretch, extend," from root *stere-, *ster- "to spread," related to stornynai "to spread out" (see structure (n.)), on the notion of the chest as broad and flat, as opposed to the neck. Related: Sternal." (Etymology Online)
  • Clavicular (n): ""collarbone," 1610s, from Middle French clavicule "collarbone" (16c.), also "small key," from Medieval Latin clavicula "collarbone" (used c.980 in a translation of Avicenna), special use of classical Latin clavicula, literally "small key, bolt," diminutive of clavis "key" (see slot (n.2)); in the anatomical sense a loan-translation of Greek kleis "key, collarbone." So called supposedly from its function as the "fastener" of the shoulder. Related: Clavicular." (Etymology Online)
  • Scapula (n): ""shoulder blade," 1570s, Modern Latin, from Late Latin scapula "shoulder," from Latin scapulae (plural) "shoulders, shoulder blades," perhaps originally "spades, shovels," on notion of similar shape, but animal shoulder blades might have been used as scraping tools in primitive times, from PIE *skap-, variant of *skep- "to cut, scrape" (see scabies)." (Etymology Online)
  • Acromion (n): "from the Greek akros, meaning topmost, highest" (Etymology Online)
  • Thorax (n): ""chest of the body," late 14c., from Latin thorax "the breast, chest; breastplate," from Greek thorax (genitive thorakos) "breastplate, chest," of unknown origin." (Etymology Online)
  • Joint (n): "c.