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Lower Motor Neurons
Lower Motor Neurons
39
Veterinary Medicine
Professional
04/20/2006

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Cards

Term
where the lower motor neurons are located in the spinal chord
Definition
ventral horn
Term
neurons to the extrafusal fibers (large named muscle)
Definition
alpha neurons
Term
neurons to intrafusal fibers that go to muscle spindles
Definition
gamma neurons (small)
Term
what is an example of a polysynaptic tract
Definition
faciculus proprius
Term
when a cell body wants to become localized near the target of innervation. the continuous column becomes fragmented
Definition
neurobiotaxis
Term
type of nerve that CN3 is
Definition
GSE
Term
where is CN3 located
Definition
rostral colliculus
Term
what does CN3 innervate
Definition
rectus muscle, ventral oblique, levator palpebrae
Term
what type of nerve is CN4
Definition
GSE
Term
where is CN4 located
Definition
caudal colliculus
Term
what does CN4 innervate
Definition
dorsal oblique eye muscles
Term
what type of nerve is CN6
Definition
GSE
Term
where is CN6 located
Definition
at the caudal cerebellar peduncle
Term
what does CN6 innervate
Definition
retractor bulbi muscles
Term
what type of nerve is CN12
Definition
GSE
Term
where is CN12 located
Definition
at the level of the obex
Term
what does CN12 innervate
Definition
tongue muscles
Term
what kind of nerve is CN5
Definition
SVE
Term
where is CN5 located
Definition
at the rostral cerebellar peduncle
Term
what does CN5 innervate
Definition
muscles of mastication
Term
what kind of nerve is CN7
Definition
SVE
Term
where is CN7 located
Definition
at the rostral part of the mylencephalon
Term
what does CN7 innervate
Definition
muscles of facial expression
Term
when CN7 wraps around CN6, what is this called
Definition
internal genu of the facial nerve
Term
what kind of nerve is CN9, 10, 11
Definition
SVE
Term
where are CN 9, 10, 11 located
Definition
at the nucleus ambiguus in the mid mylenceph.
Term
what does CN 9 and 10 innervate
Definition
pharynx, larynx, esophagus, pallet
Term
what does CN11 innervate
Definition
cervical muscles
Term
what are the divisions of CN11
Definition
external root: goes to cervical muscles, internal root: can blend with vagal nerve
Term
what part of the brain regulates parasympathetic motor
Definition
rostral hypothalamus
Term
what part of the brain controls the sympathetic motor
Definition
caudal hypothalamus
Term
what nerves are a part of the craniosacral component of the GVE
Definition
CN3, 7, 9, 10
Term
what are the signs of a disrupted sympathetic motor system
Definition
Horner's syndrome: enopthalmus (sunken eyes), prolapsed 3rd eyelid, constricted pupil
Term
what is the function of the parasympathetic part of CN3
Definition
constrict pupil
Term
what is the function of the parasympathetic part of CN7
Definition
innervates salivary glands and lacrimal gland
Term
what is the function of the parasympathetic part of CN9
Definition
innervates the zygomatic and the parotid salivary glands
Term
what is the function of the parasympathetic part of CN10
Definition
whatever organ it goes to
Term
where is the 1st order neuron of the sacral parasympathetic GVE system
Definition
in the lateral horn of the sacral SC (pelvic nerve)
Term
where is the 2nd order neuron of the sacral parasympathetic GVE system
Definition
pelvic ganglion or terminal ganglion of organs
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