Muscles of the Human Body! Vertebral Column and Thorax.

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Presentation transcript:

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 Spinalis Longissimus Iliocostalis

Quadratus Lumborum When acting together, extends lumbar spine; maintains upright posture

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

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

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

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

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

Transversus Abdominis Compresses abdomen

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