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Muscles of the Human Body!

Muscles of the Human Body!. Vertebral Column and Thorax. Erector Spinae ( Iliocostalis , Longissimus , Spinalis ). Prime mover of back extension (3 columns of muscles) Elevates and straightens the spine. Iliocostalis. Longissimus. Spinalis. Quadratus Lumborum.

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Muscles of the Human Body!

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  1. Muscles of the Human Body! Vertebral Column and Thorax

  2. Erector Spinae ( Iliocostalis, Longissimus, Spinalis) • Prime mover of back extension (3 columns of muscles) • Elevates and straightens the spine Iliocostalis Longissimus Spinalis

  3. QuadratusLumborum • When acting together, extends lumbar spine; maintains upright posture

  4. External Intercostals • Pulls ribs towards one another to elevate rib cage, aides in breathing in.

  5. Internal Intercostals • Draw ribs together and depresses rib cage; aids in forced expiration

  6. Diaphragm • Prime mover of inspiration. Dome-shaped when relaxed, flattened when contracted.

  7. Rectus Abdominis • Flexes lumbar region of vertebral column. Flexes the vertebral column as in a sit up.

  8. External & Internal Oblique Synergist to Rectus abdominis when the pair contracts at the same time (sit-up). Compresses the abdomen. Acting individually, used in trunk rotation, lateral flexion (side sit up) Internal Oblique External Oblique

  9. TransversusAbdominis Compresses abdomen

  10. Linea Alba “White seam”, a tendinous seam hat runs from the sternum to the pubic symphysis. Rectus abdominis muscle fuses here

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