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regio cervicalis lateralis, trigonum cervicale posterius
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The triangles of the neck (Posterior triangles to the right Sternocleidomastoideus runs vertically Occipital Triangle labeled at right, and Subclavian Triangle labeled at bottom)
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Side of neck, showing chief surface markings (Nerves are yellow, arteries are red)
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The (or '''lateral cervical region''') is a region of the
Neck .
It has the following boundaries:
The posterior triangle is crossed, about 2.5 cm above the clavicle, by the inferior belly of the
Omohyoideus , which divides the space into two triangles:
It contains the
Accessory Nerve , which crosses the triangle from the upper 1/3 of sternocleidomastoideus to the lower 2/3 of the trapezius.
It is particularly vulnerable to damage at lymph node biopsy, where damage results in an inability to shrug the shoulders or raise the arm above the head (eg, for brushing hair)
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- - "Identification of the muscles associated with the posterolateral triangle."
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