Unit I Innervations Head and Neck Flashcards
Motor innervation of facial muscles is from
Facial Nerve (CN VII)
Sensory innervation of the face is from
Trigeminal Nerve (CN V)
Name the branches of CN V (trigeminal)
Opthalmic
mandibular
maxillary
Distribution of opthalmic
mostly to face and scalp
Distribution of maxillary nerve
mostly to cheek and lateral to orbit
Distribution of mandibular nerve
mostly to chin and temporal region
Subdivisions of opthalmic nerve
supraorbital supratrochlear external nasal infratrochlear lacrimal
Subdivisions of maxillary nerve
zygomaticotemporal
zygomaticofacial
infraorbital
Subdivisions of mandibular nerve
auriculotemporal
buccal
mental
What is Trigeminal Neuralgia?
severe pain in the area of sensory distribution of trigeminal nerve
List some manifestations of Trigeminal Neuralgia
Often due to touch, is most common in maxillary branch; cause unknown
What supplies the occipital region?
the greater occipital nerve
What primary ramus does the greater occipital nerve come form?
dorsal primary ramus of C2
What supplies the upper part of the back of the neck?
the third occipital nerve
What primary ramus does the third occipital nerve come from?
posterior primary ramus of C3
What does the third occipital nerve supply?
upper part of the back of the neck
What supplies the lower part of the back of the neck?
posterior primary ramus of C4
Is C1 strictly a motor or sensory nerve?
motor
What is the sensory innervation of the anterior and lateral aspects of the neck?
Anterior (ventral) primary rami of C2-C4
What forms the Cervical plexus?
ventral primary rami of C1-C4
What does C5-C8 supply
sensory innervation to the skin of the upper limb
What supplies the lateral part of the occipital regin, posterior to the ear?
the lesser occipital nerve
What does the lesser occiptal nerve come from?
C2
What supplies the angle of the mandible and area inferior to the ear?
the Great auricular nerve
What does the great auricular nerve come from?
C2-C3
What supplies the anterior surface of the neck?
the transverse cervical nerve
What does the transverse cervical nerve come form?
C2-C3
What does the supraclavicular nerve supply?
the lateral surface of the neck
List the subdivisions of the supraclavicular nerve
medial
intermediate
lateral
What do the motor fibers of the cervical plexus innervate?
infrahyoid muscles
What is the loop called that the motor fibers arise from?
ansa cervicalis
What does the superior root of the ansa cervicalis come from?
C1, or C1-C2
What does the superior root of the ansa cervicalis descend from?
the hypoglassal nerve
What does the inferior root of the ansa cervicalis come from?
C2-C3
What does the inferior root of the ansa cervicalis descend from?
the cervical nerve branches to join the supeior root
What three muscles does the ansa cervicalis (cervical plexus) supply?
sternohyoid
sternothyroid
omohyoid
What innervates the thyrohyoid?
the hypoglossal nerve
The phrenic nerve arises from?
C3-C5
What are the motor innervations of the phrenic?
motor to diaphragm
What are the sensory innervations of the phrenic nerve?
some sensory to membranes in the thorax and abdomen
Where in the neck can the phrenic nerve be found?
lying on the anterior side of the anterior scalene muscle
