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Introduction
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Peripheral nervous system localization
The peripheral nerves and contributing spinal nerve roots that contribute to each reflex arc covered in this module are listed below.

Reflex Peripheral nerve Spinal nerve roots
Biceps Brachii Musculocutaneous nerve C5 C6
Brachioradialis Radial nerve C5 C6 C7
Triceps Brachii Radial nerve C6 C7 C8
Adductor (brevis and longus) Obturator nerve L2 L3 L4
Quadriceps Femoral nerve L2 L3 L4
Hamstring (medial) Tibial part of the Sciatic nerve L5 S1
Achilles tendon Tibial nerve L5 S1 S2

Spinal nerve roots identified in bold text represent primary or “key” innervation as they are typically more useful in identifying a nerve root lesion at a particular spinal segment. The correlation of deep tendon reflex examination findings with other neurological examination data will be required to accurately identify a specific level of dysfunction.

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Section: Introduction
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