Anterior Muscles Origin on pelvis or vertebral column – Iliacus – Psoas major.
Muscles of the Human Body! Vertebral Column and Thorax.
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Transcript of Muscles of the Human Body! Vertebral Column and Thorax.
![Page 1: Muscles of the Human Body! Vertebral Column and Thorax.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649f045503460f94c17cd5/html5/thumbnails/1.jpg)
Muscles of the Human Body!
Vertebral Column and Thorax
![Page 2: Muscles of the Human Body! Vertebral Column and Thorax.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649f045503460f94c17cd5/html5/thumbnails/2.jpg)
Erector Spinae ( Iliocostalis, Longissimus, Spinalis)
• Prime mover of back extension (3 columns of muscles)
• Elevates and straightens the spine
Spinalis
Longissimus
Iliocostalis
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Quadratus Lumborum• When acting together, extends lumbar spine;
maintains upright posture
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External Intercostals
• Pulls ribs towards one another to elevate rib cage, aides in breathing in.
![Page 5: Muscles of the Human Body! Vertebral Column and Thorax.](https://reader035.fdocuments.us/reader035/viewer/2022062422/56649f045503460f94c17cd5/html5/thumbnails/5.jpg)
Internal Intercostals
• Draw ribs together and depresses rib cage; aids in forced expiration
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Diaphragm
• Prime mover of inspiration. Dome-shaped when relaxed, flattened when contracted.
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Rectus Abdominis• Flexes lumbar region of vertebral column.
Flexes the vertebral column as in a sit up.
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External & Internal ObliqueSynergist 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
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Transversus Abdominis
Compresses abdomen
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Linea Alba“White seam”, a tendinous seam hat runs from
the sternum to the pubic symphysis. Rectus abdominis muscle fuses here