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Purpose of cranial nerves
1.input/output for head 2. run all vital organs
I
Olfactory
II
Optic
III
Oculomotor
IV
Trochlear
V
Trigeminal
VI
Abducens
VII
Facial
VIII
Vestibulocochlear
IX
Glossopharyngeal
X
Vagus
XI
Spinal Accessory
XII
Hypoglossal
I Olfactory
Smell
II Optic
Vision
III Oculomotor
Eyelid and eyeball movement
IV Trochlear
1. Superior Oblique (turns eye downward and laterally)
V Trigeminal (2)
1. Muscles of Mastication 2. Sensation of face, mouth, touch, and pain
VI Abducens
Lateral Rectus (turns eye laterally)
VII Facial (4)
1. Muscles: Expression and stapedius 2. Secretion of lacrimal glands 3. Taste (anterior 2/3) 4. Senation - external auditory meatus and nasopharynx
VIII Vestibulocochlear
Hearing and vestibular (balance)
IX Glossopharyngeal (3)
1. Taste posterior 1/3 of tongue 2. Sensory - tonsils, pharynx, middle ear, soft palate 3. Motor - stylopharyngeus, pharyngeal musculature
X Vagus (3)
1. Motor - Pharynx, heart, lung, bronchi, GI tract 2. Sensory - heart, lungs, bronchi, trachea, larynx, pharynx, GI tract, external ear 3. Tast of Epiglottis
XI Spinal Accessory (2)
1.Controls trapezius and sternocleidomastoid 2. Controls swallowing movements
XII Hypoglossal
Controls tongue movements
Orbital structures are innervated by what cranial nerves
II, III, IV, VI, VII
Motor functions of striated muscles controlled by
III, IV, VI, VII
What caries sensory supply from orbital structures
V
What carries visual information
II
What structures of the eye only feel pain
cornea, iris, conjunctiva, sclera
structures from the medial canthi area including, canaliculi, lacrimal sac, medial aspect of eyelids, and skin join to form
infra-trochlear nerve
Infra-trochlear joins into what?
nasociliary nerve
sensory fibers from skin along center of nose, nasal mucosa and ethmoid sinuses
anterior ethmoid nerve
fibers from ethmoid sinesus and the sphenoid sinuses
posterior ethmoid nerve
Corneal sensory information is how many times more dense
3 to 4
Where are the three networks of corneal nerves
1. corneal epithelium 2. anterior stroma 3. middle stroma
Where is there no sensation in cornea
posterior stroma, descemet's memebrane, endothelium
The corneal nerves form what nerves
two long ciliary nerves
What do the long ciliary nerves carry to eye
sympathetic fibers for dilation
corneal nerves that leave through limbus form what...
short ciliary nerves
How many ciliary nerves leave the sclera
6 to 10
short ciliary nerves become what
sensory root of the ciliary ganglion (no synapse)
What does the sensory root of ciliary ganglion join with
nasociliary nerve
What else do the short ciliary nerves carry
para and sympathetic fibers
What five things make up the nasociliary nerve
1. Infratrochlear nerve 2. Anterior ethmoid nerve 3. Posterior ethoid nerve 4. Long ciliary nerves 5. sensory root of the ciliary ganglion
Where does the nasociliary nerve exit the orbit
common tendanous ring
when long ciliary nerve fibers loop into the sclera from the suprachoroidal space
Scleral Nerve Loops of Axenfield
An acute CNS infection that causes shingles on only part of the face. Affects certain dermatomes and affects the nasociliary nerve.
Herpes Zoster
What is the sign affecting tip of nose
Hutchinson's sign
Sensory fibers from skin and muscles of forehead and upper eyelid come together to form two nerves
supratrochlear nerve and supraorbital nerve
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