SM_16b: Overview of the Cranial Nerves: I-IV and VI Flashcards
Olfactory nerve (I) exits the ____ of the ____
Olfactory nerve (I) exits the cribriform plate of the ethmoid bone
Primordium for the olfactory nerve is the ____
Primordium for the olfactory nerve is the olfactory placode
Olfactory epithelium is in the ___
Olfactory epithelium is in the upper nasal cavity / septum
Olfactory tract is an extension of the ____ surrounded by ____, while nerves are ____
Olfactory tract is an extension of the brain surrounded by meninges, while nerves are short
Respiratory epithelium has ____ for smell
Respiratory epithelium has bipolar neurons for smell
Optic nerve (II) runs with the ____ through the ____ of the ____
Optic nerve (II) runs with the ophthalmic artery through the optic canal of the lesser wing of the sphenoid
(special sensory for vision)
Describe the different visual field deficits with nerve injury
Different visual field deficits with nerve injury
- Medial half of each visual field crosses over
Primordium of optic nerve (II) is the ____
Primordium of optic nerve (II) is the optic cup
- Optic cup is ectodermal extension of the brain surrounded by meninges
- Increase in CSF pressure can compress the optic nerve
- Inner layer gives rise to the visual retina, while the outer layer gives rise to the pigmented retina
____, ____, and ____ exit the superior orbital fissure
Oculomotor (III), trochlear (IV), and abducens (VI) nerves exit the superior orbital fissure
Oculomotor nerve (III) is somatomator to ____ and presynaptic for ____
Oculomotor nerve (III) is somatomator to all extraocular muscles except lateral rectus and superior oblique and presynaptic parasympathetic for ciliary muscle and pupil constrictor
Trochlear nerve is somatomotor to ____, which moves the pupil ____
Trochlear nerve is somatomotor to the superior oblique muscle, which moves the pupil down and out
(clinical testing position: move pupil in, then down)
Clinically test the trochlear nerve by moving the pupil ____ then _____
Clinically test the trochlear nerve by moving the pupil in then down
(trochlear nerve is somatomotor to the superior oblique muscle, which moves the pupil down and out)
Abducens nerve (VI) is somatomotor to the ____, which ____ the pupil
Abducens nerve (VI) is somatomotor to the lateral rectus, which abducts the pupil
Primordia for oculomotor (III), trochlear (IV), and abducens (VI) nerves are ____
Primordia for oculomotor (III), trochlear (IV), and abducens (VI) nerves are pre-otic head somites
Parasympathetics from ___ nerve enter the ciliary ganglion
Parasympathetics from oculomotor nerve (III) enter the ciliary ganglion