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Where is the Cervical Plexus located?
The posterior triangle of the neck, deep to the SCM.
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Which nerve roots emerge from the Cervical Plexus?
C1-C4/C5.
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What does the Cervical Plexus give rise to?
Several branches that innervate various structures of the neck, head, upper thorax.
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Which nerve innervates the skin of the posterior part of the scalp behind the ear?
Lesser Occipital Nerve (C2).
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Which nerve innervates the skin over the parotid gland, external ear, and mastoid process?
Greater Auricular Nerve (C2-3).
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What does the Transverse Cervical Nerve (C2-3) innervate?
Anterior cervical region.
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What is the function of the Phrenic Nerve (C3,4,5)?
Innervates the thoracic diaphragm and pericardium.
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What does the Ansa Cervicalis (C1-C3) innervate?
Infrahyoid “Strap” muscles.
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What is the clinical significance of the Spurling’s Test?
Suggests nerve impingement from intervertebral disc pathology.
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What are the entrapment sites for Thoracic Outlet Syndrome (TOS)?
Interscalene Triangle, Costoclavicular Approximation, Thoraco-Coraco-Pectoral (TCP) Tunnel.
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