Spinal Nerves Exiting the Cord from the Level of L4

question 123

Multiple Choice

Spinal nerves exiting the cord from the level of L4 to S4 form the

• A)lumbar plexus.
• B)femoral plexus.
• C)sacral plexus.
• D)pelvic plexus.
• E)brachial plexus.

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Definitions:

Residual Volume (RV)

The volume of air remaining in the lungs after a maximal exhalation, preventing lung collapse and ensuring continuous gas exchange.

Inspiratory Reserve Volume (IRV)

The extra volume of air that can be breathed in beyond a standard breath.

Expiratory Reserve Volume (ERV)

The additional air that can be forcibly exhaled after the completion of a normal, passive exhalation.

Vital Capacity (VC)

The maximum amount of air a person can expel from the lungs after a maximum inhalation, a measure of lung function.