Human Movement Science & Functional Anatomy of the:
Rectus Abdominis (and Pyramidalis)
by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS
What’s in a name?
- Rectus Abdominis
- Rectus – rectify (v.) c.1400, from Old French rectifier, literally “to make straight” (14c.), from Late Latin rectificare “make right,” from Latin rectus “straight” (see right (adj.1)) + root of facere “to make” (see factitious). Related: Rectified; rectifying. (Etymology Online)
- Abdominis – abdomen (n.) 1540s, “belly fat,” from Latin abdomen “belly,” which is of unknown origin, perhaps from abdere “conceal,” with a sense of “concealment of the viscera,” or else “what is concealed” by proper dress. (Etymology Online)
- "the straight muscle that conceals the abdominal viscera"
- pyramid (n.) - 1550s (earlier in Latin form piramis, late 14c.), from French pyramide (Old French piramide "obelisk, stela," 12c.), from Latin pyramides, plural of pyramis "one of the pyramids of Egypt," from Greek pyramis (plural pyramides) "a pyramid," apparently an alteration of Egyptian pimar "pyramid." Financial sense is from 1911. Related: Pyramidal. (Etymology Online)
- -al (1) suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)). (Etymology Online)
- A muscle shaped like a pyramid
Pyramidalis (being traced with surgical tool in image) - https://academic.amc.edu/martino/grossanatomy/site/medical/lab%20manual/gastrointestinal/Dissections/Anterior%20Abd%20Wall/Anterior%20Abd%20Wall%2034.html
Attachments and Innervation
- Origin: The tendons of each individual rectus abdominis attach to