Human Movement Science & Functional Anatomy of the:

Pectoralis Major

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

By Anatomist90 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22710416 By Anatomist90 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22710416

What’s in a name

  • Pectoral (n.) early 15c., “ornament worn on the breast,” from Middle French pectoral and directly from Latin pectorale “breastplate,” noun use of neuter of adjective pectoralis (see pectoral (adj.)). – As a shortened form of pectoral muscle, attested from 1758. Slang shortening pec for this is first recorded 1966. Related: Pectorals; pecs. (Etymology Online)
  • Major – major (adj.) c.1300, from Latin maior (earlier *magjos), irregular comparative of magnus “large, great” (see magnate). (Etymology Online)

Henry Gray (1918) Anatomy of the Human Body (See Henry Gray (1918) Anatomy of the Human Body (See "Book" section below)
Bartleby.com: Gray's Anatomy, Plate 200

Attachments:

  • Origin:

    • Clavicular Head (Upper Fibers): Anterior surface of the medial 1/2 of the clavicle (8, 11).
    • Sternal Head (Lower Fibers): Anterior surface of the sternum, cartilages of first six or seven ribs, and aponeurosis of the external oblique (3, 8, 11).

  • Note: Some texts divide the pectoralis major into 4 distinct groups of fibers - those arising from the clavicle, those arising from the sternum, deeper fibers arising from the costal cartilage of the 2nd to 6th or 7th ribs, and the most superficial fibers originating from the fascia of the external obliques and sometimes the rectus abdominis (8, 22).

By Henry Vandyke Carter - Henry Gray (1918) Anatomy of the Human Body (See By Henry Vandyke Carter - Henry Gray (1918) Anatomy of the Human Body (See "Book" section below) Bartleby.com: Gray's Anatomy, Plate 115, Public Domain, https://commons.wikimedia.org/w/index.php?curid=58448

  • Insertion:

    • Clavicular Head: Crest of the greater tubercle (lateral lip of the