Anatomy Block 2: pectoral region, posterior triangle of neck + brachial plexus

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4 Terms

1
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Posterior Triangle

lies over the axillary inlet + is associated with structures (nerves + vessels) that pass into and out of the upper limb

<p>lies over the axillary inlet + is associated with structures (nerves + vessels) that pass into and out of the upper limb</p>
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Boundaries of Posterior Triangle

  • Anterior border: posterior edge of SCM

  • Posterior border: anterior edge of trapezius

  • Base: middle 1/3 of clavicle

  • Apex: occipital bone at point where attachments + trapezius meet

  • Roof: layer of cervical fascia that surrounds the SCM + trapezius

  • Floor: cervical fascia, splenius capitus mm, levator scapulae mm, scalene mm (3)


<ul><li><p>Anterior border: posterior edge of SCM</p></li><li><p>Posterior border: anterior edge of trapezius</p></li><li><p>Base: middle 1/3 of clavicle </p></li><li><p>Apex: occipital bone at point where attachments + trapezius meet </p></li><li><p>Roof: layer of cervical fascia that surrounds the SCM + trapezius</p></li><li><p>Floor: cervical fascia, splenius capitus mm, levator scapulae mm, scalene mm (3) </p></li></ul><p></p>
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Subdivisions of Posterior Triangle

  • occipital triangle

  • subclavian triangle

  • separated by omohyoid muscle!!!

    • superior + inferior belly


<ul><li><p>occipital triangle </p></li><li><p>subclavian triangle </p></li><li><p>separated by omohyoid muscle!!! </p><ul><li><p>superior + inferior belly </p></li></ul></li></ul><p></p>
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Erb’s Point