Ns6 Posterior Triangle Of Neck

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NS6
Lecture 6 of 63 in the Neuroscience Module

"Posterior Triangle of the Neck" [Anatomy]

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  • Ns6 Posterior Triangle Of Neck

    1. 1. Posterior Triangle of Neck Dr. Skantha Kandiah MBA, MSc (NUI), MB BCh BAO (NUI), LRCP & SI Senior Lecturer in Anatomy and Lecturer in Healthcare Management RCSI
    2. 2. Posterior Triangle
    3. 3. Posterior Triangle <ul><li>Base: Middle 1/3 of the clavicle </li></ul><ul><li>Roof: Investing layer of deep cervical fascia </li></ul><ul><li>Floor: prevertebral fascia lying on splenius, levator scapulae and scalenus medius </li></ul>
    4. 4. Contents <ul><li>Upper trunk of Brachial Plexus </li></ul><ul><li>Apex of the lung extends to 2cm above the middle 1/3 of the clavicle </li></ul><ul><li>Lymph nodes </li></ul><ul><li>Subclavian artery – at root of neck </li></ul><ul><li>Subclavian vein – at root of neck </li></ul><ul><li>External Jugular Vein </li></ul><ul><li>Spinal part of XI </li></ul>
    5. 5. External Jugular Vein
    6. 6. XI <ul><li>Accessory nerve </li></ul><ul><li>Spinal and Cranial parts </li></ul><ul><li>Spinal part accessory nerve – superficial structure in posterior triangle </li></ul><ul><li>1/3 down the posterior border of SCM to 2/3 down the anterior border of trapezius </li></ul>
    7. 7. XI
    8. 8. XI <ul><li>SCM </li></ul><ul><li>Trapezius </li></ul><ul><li>How do you test above muscles? </li></ul><ul><li>Spinal and cranial parts </li></ul>
    9. 9. Other Nerves…..
    10. 10. Cervical Plexus: Muscular Branches <ul><li>Anterior primary rami of the upper cervical nerves form the cervical plexus </li></ul><ul><li>ansa cervicalis: C1,2,3 and XII (descendens hypoglossi) </li></ul><ul><li>Ansa cervicalis supplies the strap muscles </li></ul><ul><li>Phrenic nerve: C3,4,5 </li></ul>
    11. 11. Cervical Plexus: Cutaneous Branches <ul><li>Lesser occipital C2: upper triangle, behind ear </li></ul><ul><li>Great Auricular C2,3: skin over parotid </li></ul><ul><li>Transverse Cervical C2,3: chin to sternum </li></ul><ul><li>Supraclavicular C3,4 </li></ul>
    12. 12. Stab Wound to Posterior Triangle <ul><li>Upper trunk brachial plexus injury </li></ul><ul><li>What is it called? </li></ul><ul><li>Apex of the lung is here, so what might happen? </li></ul><ul><li>Bleeding from? </li></ul>
    13. 13. Sample Question <ul><li>Describe the boundaries and contents of the posterior triangle of the neck. Explain the consequences of a stab injury to the posterior triangle. Give surface markings of any important structures you name. </li></ul>

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