Human Movement Science & Functional Anatomy of the:

Infraspinatus and Teres Minor:

External Rotators of Rotator Cuff Musculature

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

Note: The infraspinatus and teres minor are two of the four muscles of the rotator cuff. The supraspinatus and subscapularis are covered in separate articles:

By Anatomography - en:Anatomography (setting page of this image), CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=22793538 By Anatomography - en:Anatomography (setting page of this image), CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=22793538

What’s in a name

Rotator Cuff:

  • rotate (v.) 1794, intransitive, back-formation from rotation. Transitive sense from 1823. Related:Rotated; rotating. Rotator “muscle which allows a part to be moved circularly” is recorded from 1670s. (Etymology Online)
  • cuff (n.) “bottom of a sleeve,” mid-14c., cuffe “hand covering, mitten, glove,” perhaps somehow from Medieval Latin cuffia “head covering,” of uncertain origin. Sense of “band around the sleeve” is first attested 1520s; sense of “hem of trousers” is 1911. (Etymology Online)

    • "A covering that rotates"

By Anatomography - en:Anatomography (setting page of this image), CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=22787453 By Anatomography - en:Anatomography (setting page of this image), CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=22787453

 

Infraspinatus:

  • infra (adv.) "under, below, further on," from Latin infra (see infra-). (Etymology Online)
  • spine (n.) c. 1400, "backbone," later "thornlike part" (early 15c.), from Old French espine "thorn, prickle; backbone, spine" (12c., Modern French épine), from Latin spina "backbone," originally "thorn, prickle" (Etymology Online)
  • natal (adj.) late 14c., "of or pertaining to birthdays," from Latin natalis "pertaining to birth or origin," (Old Latin gnasci; see genus) (Etymology Online)

    • "originating inferior to the spine of the scapula"

 

Teres Minor: