Dissection of head and neck from a posterior approach
Relations of left sternocleidomastoid muscle, internal jugular vein, cervical plexus and cervical spine
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Image #80-7
Dissection of head and neck from a posterior approach
Relations of left sternocleidomastoid muscle, internal jugular vein, cervical plexus and cervical spine
The fascia has been removed from the upper part of the sternocleidomastoid muscle, which has been pulled somewhat anteriorly. The bodies of the upper cervical vertebrae have been exposed to the left of the midline. The levator scapulae muscle has been cut from its origins and retracted medially and inferiorly to expose the cervical plexus.
1
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Internal jugular vein (pointer at inferior margin of jugular foramen)
2
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Hypoglossal nerve (XII)
3
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Accessory nerve (XI)
4
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Tendon of insertion of longissimus capitis muscle (divided by occipital artery)
5
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Splenius capitis muscle (cut across)
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Anterior branch of cervical nerve I
7
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Posterior belly of digastric muscle
8
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Levator scapulae muscle (cut across; a similar, more inferior origin is visible medial to the third cervical nerve (24))