week 7 - muscular system (pt.3) 💪

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9 Terms

1
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— Muscles of Back and Trunk (header)

  • Functions

  • Groups (superficial back muscles, deep back muscles, anterior trunk muscles)

  • Triangle of Auscultation


2
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What are the overall functions of the muscles of the back and trunk?

  • provide… (posture, stability, movement for spine, torso)

  • contribute (breathing, trunk rotation & limb movements

  • protect… (internal organs & support core strength)


3
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What are the groups?

  • superficial back muscles

  • deep back muscles

  • anterior trunk muscles


4
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Superficial back muscles (function)

  • move upper limbs & shoulders

  • act on the shoulder


<ul><li><p>move upper limbs &amp; shoulders </p></li><li><p>act on the shoulder </p></li></ul><p></p>
5
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Deep back muscles (functions)

  • extend the trunk

  • rotate the vertebral column


<ul><li><p>extend the trunk </p></li><li><p>rotate the vertebral column </p></li></ul><p></p>
6
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Anterior trunk muscles (functions)

  • form the anterior wall of the abdomen

  • support the viscera

  • help to increase intrabdominal pressure


<ul><li><p>form the anterior wall of the abdomen </p></li><li><p>support the viscera </p></li><li><p>help to increase intrabdominal pressure </p></li></ul><p></p>
7
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What are the superficial back muscles?

  1. Trapezius

  2. Latissimus dorsi

  3. Rhomboids (major & minor)

  4. Levator scapulae

  5. Teres Major


<ol><li><p>Trapezius </p></li><li><p>Latissimus dorsi</p></li><li><p>Rhomboids (major &amp; minor)</p></li><li><p>Levator scapulae</p></li><li><p>Teres Major</p></li></ol><p></p>
8
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Superficial Back Muscles: Trapezius (state— function + extra info)

→ arises from the back but produces movement at glenohumeral joint


→ Extensive attachments= multiple types of action

  • Superior fibres: elevate scapula, extend head

  • Middle fibres: adduct (retract) scapula

  • Inferior fibres: depress scapula


<p><span>→ arises from the back but produces <strong><em>movement at glenohumeral joint</em></strong></span></p><p></p><p><span>→ Extensive attachments= multiple types of action</span></p><ul><li><p><strong>Superior fibres: </strong>el<span>evate scapula, extend head</span></p></li><li><p><strong>Middle fibres: </strong><span>adduct (retract) scapula</span></p></li><li><p><span><strong>Inferior fibres: </strong>depress scapula </span></p></li></ul><p></p>
9
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Superficial Back Muscles: Latissimus Dorsi (state— function + extra info)

→ extends. adducts, medially rotates arm at shoulder / draws arm inferior & posteriorly

Large back attachment:

  • thoracic/lumbar vertebral spine

  • ribs

  • crest of ilium

  • narrows to bicipital groove of humerus


<p>→ extends. adducts, medially rotates arm at shoulder / draws arm inferior &amp; posteriorly </p><p>Large back attachment:</p><ul><li><p>thoracic/lumbar vertebral spine </p></li><li><p>ribs </p></li><li><p>crest of ilium </p></li><li><p>narrows to bicipital groove of humerus </p></li></ul><p></p>