Cranial Nerves Flashcards
What are the cranial nerves?
Olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulochochlear, glossopharyngeal, vagus, spinal accessory, hypoglossal. “Oh once one takes the anatomy final very good vacations are heavenly”
What modalities do the cranial nerves have?
Somatic motor, branchial motor, visceral motor, visceral sensory, general sensory, special sensory
What are the branchial arches and their associated cranial nerves?
First (mandibular) arch = trigeminal n
Second (hyoid) arch = facial n
Third arch = glossopharyngeal n
Fourth and sixth = superior laryngeal branch of vagus and recurrent laryngeal branch of vagus
If a muscle has the word “tensor” in it’s name, what nerve innervates it?
Trigeminal n
What is the only postganglionic parasympathetic nerve?
Deep petrosal n
How do postganglionic sympathetic fibers get to the structures that they innervate?
By traveling on vessels that go to those structures
All sympathetic fibers are….?
Postganglionic
What four ganglia in the head do preganglionic parasympathetic fibers synapse at?
Cilliary, pterygopalatine, otic, and submandibular
Preganglionic parasympathetics are carried by which cranial nerves?
III, VII, IX, X
How do postganglionic parasympathetic fibers get to the structures that they innervate?
“Piggy back” on branch of trigeminal n
What type of nerve is the olfactory nerve?
Special sensory
What type of nerve is the optic nerve?
Special sensory
What nerves go to the ocular muscles?
CN III, CN IV, CN VI
What type of nerve is the oculomotor nerve?
Somatic motor and visceral motor
What type of nerve is the trochlear nerve?
Somatic motor
What does the trochlear nerve do?
Superior oblique muscle of the eye
What type of nerve is the abducens nerve?
Somatic motor
What does the abducens nerve do?
Lateral rectus muscle of the eye (ABducts eye)
How does oculomotor n vs trochlear/abducens n move the eye?
Oculomotor - up and in
Trochlear/abducens - down and out
What type of nerve is the trigeminal nerve?
Branchial motor and general sensory
What are the divisions of the trigeminal n?
Ophthalmic (V1), maxillary (V2), and Mandibular (V3)
What is another name for trigeminal neuralgia?
Tic douloureux
What branches arise from the ophthalmic division (V1)?
Lacrimal, frontal, nasociliary, meningeal branch
What branches arise from the maxillary division (V2)?
Zygomatic, infraorbital, superior alveolar, palatine, meningeal
