Thoracic nerves

by Craig Canby, PhD

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    Welcome to this lecture on the nerves of the thoracic cavity. This slide brings us to the learning objectives that you should be able to answer at the conclusion of this presentation. First, describe the distributions of the phrenic nerve and the sympathetic and parasympathetic divisions of the autonomic nervous system. Compare and contrast the general functions of the autonomic nervous system. Describe the clinically applied anatomy of vocal cord paralysis and achalasia. Describe the clinically applied anatomy of asthma, pancoast tumour and cardiac referred pain. And then, we will summarize the key take-home messages from this presentation. And then, lastly, provide attribution for the images that were used throughout this presentation. This is the body map. And since we are looking at the nerves of the thoracic cavity, we will be focusing in on this area, in an anterior view and then, we will also be looking internally along the posterior thoracic wall. The nerves that we are going to be covering in this presentation are the phrenic nerves, the vagus nerves, the sympathetic trunks as well as autonomic nervous plexuses. Our first nerve is that of the phrenic nerve. The phrenic nerve is formed from anterior rami of the third cervical spinal nerve, the fourth cervical spinal nerve and the fifth cervical spinal nerve and these anterior rami help to form, in part, the cervical plexus. The phrenic nerve, once it’s formed, will have an anterior course to the anterior scalene muscle. Here we see the right phrenic nerve on the right anterior scalene muscle, in the neck, and then we see the left phrenic nerve running on the anterior surface of the left anterior scalene. All phrenic nerves are going to run on the lateral margins of the pericardium. They convey both motor and sensory fibers and...

    About the Lecture

    The lecture Thoracic nerves by Craig Canby, PhD is from the course Thoracic Viscera. It contains the following chapters:

    • Phrenic nerve
    • Vagus nerve
    • Sympathetics in the thorax
    • Clinically applied anatomy

    Included Quiz Questions

    1. CIII-CV
    2. CI-CII
    3. CII-CIII
    4. CV-CVII
    5. CVI-CVIII
    1. Right subclavian artery
    2. Left subclavian artery
    3. Aortic arch
    4. Trachea
    5. Esophagus
    1. Recurrent laryngeal nerve
    2. Phrenic nerve
    3. Posterior vagal trunk
    4. Anterior vagal trunk
    5. Sympathetic trunk
    1. Bronchodilation
    2. Vasodilation of pulmonary vessels
    3. Decrease in heart rate
    4. Increase in peristalsis
    1. Increased sweating
    2. Ptosis
    3. Miosis
    4. Weakness of intrinsic hand muscles

    Author of lecture Thoracic nerves

     Craig Canby, PhD

    Craig Canby, PhD

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