Anatomy Quiz 4 6

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Ansa Cervicalis
- • Ventral rami of C1- C3
- • Superior root: C1 (descends hypoglossal)
- • Inferior root: C2-3 (descends cervicalis)
- • Roots connect along lateral border of the carotid sheath
- • Motor component of the cervical plexus
Ansa Cervicalis innervates
- • Omohyoid
- • Sternohyoid
- • Sternothyroid
Cervical Plexus
- • Formed by C1 to C4 ventral rami
- • Originates deep to the sternocleidomastoi
- • Sensory branches pass along the posterior border of the muscle at Erb's point to travel to their destination
Ventral rami nerves
- • Lesser occipital
- • Great auricular
- • Transverse cervical
- • Supraclavicular
Lesser occipital nerve source

Cervical plexus - ventral ramus of C2
Lesser occipital nerve
- • Passes posterior to the SCM at Erb's point
- • Continues posterior to the auricle supplying the skin in the region
Greater auricular nerve source

Cervical plexus - ventral rami C2 and C3
Great auricle nerve
- • Passes posterior to the SCM at Erb's point
- • Ascends along the SCM, dividing into anterior and posterior branches:
- • Anterior branch innervates the skin of the face over the parotid gland
- • Posterior branch innervates the skin over the mastoid process, the posterior portion of the auricle, and the concha and lobule
Transverse cervical nerve
- • Passes posterior to SCM at Erb's point
- • Crosses anteriorly along the SCM, dividing into ascending and descending branches
- • Ascending and descending branches pass through the platysma m. to supply the skin of the neck from the region between the mandible and the manubrium
Supraclavicular nerve source

• Cervical plexus - ventral rami C3 and C4
Supraclavicular nerve
- • Passes posterior to the sternocleidomastoid m. at Erb's point
- • Travels inferiorly in an oblique direction through the posterior triangle of the neck
- • Divides into 3 major branches:
- • --medial supraclavicular
- • --middle supraclavicular
- • --lateral supraclavicular
Medial supraclavicular nerve

supplies the skin up to the midline
Middle supraclavicular nerve

supplies the skin over the pectoralis major and deltoid m. region
Lateral supraclavicular

supplies the skin along the deltoid and anterior trapezius mm.

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Anatomy Quiz 4 6

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Anatomy Quiz 4 6

Updated

2014-11-15T18:26:07Z

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