Muscles of the Trunk

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identify/ function

Deltoid- flexion and medial rotation of arm

identify and function posterior

Latissimus Dorsi- adduction of arm

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Pectoralis major - adduction of the arm

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external intercostal muscle -Muscle of respiration

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perctoralis minor- Stabilizes scapula (holds it against thoracic wall)

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Sternocleidomastoid m.- Unilateral: rotation of head so face turns to opposite side

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serratus anterior- Protraction (abduction) of scapula

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internal intercostal-Muscle of respiration

identify and function anterior

latiissimus dorsi-Adduction of arm

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rectus sheath-

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external abdominal oblique-Unilateral: rotation of trunk

i and function

iliacus-Flexion of thigh

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Anterior Rectus sheath

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Linea Alba

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Transverse abdominis -Compression of anterior abdominal wall and viscera (increases intra-abdominal pressure)

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Psoas Major-Flexion of thigh

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Quadratus Lumborum- Unilateral: lateral flexion of trunk

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Trapezius-

Superior fibers: elevation of scapula; superior rotation of scapula (glenoid cavity directed superiorly)

• Middle fibers: retraction (adduction) of scapula

• Inferior fibers: depression of scapula

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Thoracolumbar fascia

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Levator Scapulae- Elevation of scapula (e.g., shrugging shoulders)

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Rhomboid Major- elevation of scapula

Identify and function

Rhomboid Minor-Elevation of scapula

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Splenius capitis- Unilateral: rotation of head to same side

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deltoid- flexion and medial rotation of arm

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Latissimus dorsi- sholder arm

Extension of arm

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Trapezius-

Superior fibers: elevation of scapula; superior rotation of scapula (glenoid cavity directed superiorly)

• Middle fibers: retraction (adduction) of scapula

• Inferior fibers: depression of scapula

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infraspinatus-Lateral rotation of arm

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Teres Minor —-Adduction of arm (weak)

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Teres Major- Adduction of arm