Phrenic Nerve | Functions, Course, & Impact of C3-C5 SCIs

The video tutorial explains the phrenic nerve's role in motor and sensory functions, primarily innervating the diaphragm for breathing. It originates from the cervical plexus at C3, C4, and C5, with C4 being the largest contributor. The tutorial discusses the impact of spinal cord injuries at different levels on the phrenic nerve and diaphragm function, highlighting potential ventilator dependency. It also details the anatomical pathways of the right and left phrenic nerves, including their interactions with other structures like the brachial plexus, subclavian vein, and aortic arch.

What happens to diaphragm function in a complete spinal cord injury at the level of C3?

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Describe the path of the right phrenic nerve as it enters the thorax.

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Explain the difference in the paths of the left and right phrenic nerves.

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