Cervical Plexus Flashcards
Where does the cervical plexus come off of the spine?
The cervical enlargement of cervical spine
The cervical plexus works as a nerve ________
Anastomosis
Anatomy of the superficial cervical plexus
- Sternocleidomastoid muscle
- Mastoid Process
- Clavicle
- External Jugular Vein (Superficial cervical plexus is seen emerging behind the posterior border of the sternocleidomastoid muscle at the intersection of the muscle with the external jugular vein)
- Greater Auricular Nerve
All nerves that come off the cervical plexus are either ______ or _______
Sensory or motor
Cutaneous Nerves of the Cervical Plexus (4 Branches)
- Greater Auricular Nerve
- Transverse Cervical Nerve
- Lesser Occipital Nerve
- Supraclavicular Nerves
Greater Auricular Nerve
Innervates skin near conch audible (outer ear) and external acoustic meats (ear canal)
C2 & C3
Transverse Cervical Nerve
Innervates anterior region of neck
C2 & C3
Lesser Occipital Nerve
Innervates the skin and the scalp posterosuperior to the audible
C2 & C3
Supraclavicular Nerves
Innervates region of supraspinatus, shoulder, and upper thoracic region
C3 & C4
Muscular Nerves of the Cervical Plexus
- Ansa Cervicalis
- Phoenix Nerve
- Segmental Branches
Ansa Cervicalis
Loop formed from C1-C3
- geniohyoid (C1 only),
- thyrohyoid (C1 only),
- sternothyroid,
- sternohyoid,
- omohyoid)
Phrenic Nerve
Innervates diaphragm and the pericardium
C3-C5 (primarily C4)
Segmental Branches
Innervates anterior and middle scalenes muscle
C1-C4
Is the posterior nerve root sensory (afferent) or motor (efferent)?
Sensory (Afferent)
Is the anterior nerve root sensory (afferent) or motor (efferent)?
Motor (Efferent)
