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)
Are the anterior and posterior rami sensory (afferent) or motor (efferent)?
TRICK QUESTION! They are mixed :)
