The posterior belly of the digastric originates from the mastoid notch of the temporal bone via a short tendinous attachment, running anteriorly and inferiorly to the intermediate tendon at the hyoid. This mastoid origin is a key surgical landmark in posterior cervical triangle and parotid surgery.
The digastric posterior belly mastoid tendon is the landmark in the posterior cervical triangle approach to the internal jugular vein and XI nerve, where the digastric marks the superior boundary. In neck dissection, the digastric posterior belly and its mastoid tendon define the upper limit of levels II and IIA. Digastric transection at the mastoid groove provides access to the deep lobe of the parotid and the styloid region.
The digastric posterior belly mastoid attachment defines the superior boundary of level II neck dissection and the posterior cervical triangle, serving as the key orientation landmark in deep neck dissection and jugular vein exposure.
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