Exam 1 Flashcards
Is the nucleus of origin motor or sensory in function
Motor
Is the nuclei of termination motor or sensory in function
Sensory
How many pairs of spinal nerves are there?
31
What does the dura become after leaving CNS while surrounding nerves
Epineurium
Are DRG’s associated with the anterior or posterior horn
Posterior
What neurotransmitter do the somatic nerve fibers release at target? Is there is a ganglion before on the way to target?
ACH
No, straight from CNS to target
Glands, Cardiac tissue, and smooth muscle are all examples of what part of the nervous system
Autonomic (Visceral)
What vertebral levels would you find autonomic sympathetic fibers? Are there ganglion in the pathway? If so, where are they located?
T1-L2
Yes, they are right outside the CNS (sympathetic trunk)
What neurotransmitters are released in the autonomic sympathetic nervous system
ACH at ganglion, Norepinephrine at target
True or false; autonomic sacral splanchnic fibers are parasympathetic
False, they are sympathetic (“S” in Sacral for Sympathetic)
All of the sympathetic splanchnics are: Greater, Lesser, Least, and Sacral
True or false; autonomic pelvic splanchnic fibers are parasympathetic
True, the “P” in pelvic for parasympathetic
Where do autonomic parasympathetic fibers originate from? Are there ganglion in the pathway? If so, where are they located
From brain or S2-S4 (Pelvic splanchnics)
Yes, and close to the target organ
What neurotransmitters are released in the autonomic parasympathetic system
ACH at ganglion and ACH at target
True or false; the parasympathetic system supplies essentially the same organs as the sympathetic with fewer blood vessels
True
True or False; lower motor neurons are primarily in the anterior horn
True
Where do the typical first order neuron somatic sensory fibers lie in?
Dorsal root spinal ganglion
Where do the typical second order neurons in the somatic sensory pathway travel and communicate with?
they decussate and go to thalamus
Where do third order neurons relay information in the somatic sensory pathway
Cerebral cortex
True or false, a thin layer or mucus covers the olfactory epithelium
True
What kind of cell are olfactory neurons?
Bipolar
How many central processes (axons) are there typically in olfactory pathway? Where do they convey information?
10 to 20
Olfactory bulbs
True or false; olfactory neurons are myelinated?
False, they are covered in schwann cells
Where is the first place olfactory neurons synapse?
After they pass through the cribiform plate they synapse on dendrites of mitral cells
True or false; at olfactory neurons first synapse, synaptic glomeruli are formed
True
What are mitral cells associated with?
Olfaction
True or false; mitral cells send information posterior via the olfactory tract and splitting into the medial and lateral olfactory striae
True
Where do medial stria fibers run in olfactory pathway?
They cross midline via anterior commissure and travel to opposite olfactory bulb
True or false; Lateral stria fibers carry information to primary olfactory cortex?
True
The periamygdaloid and prepiroform area, including the uncus and broad man areas 34 and 28 are all part of what?
Primary olfactory cortex
True or false; in the olfactory pathway, there is a synapse in the thalamus
False
True or false; all sensory information in the cranial nerves travels through the thalamus except olfaction
True
What is anosmia
Loss of olfaction
Why is the vomernasal nerve important in animals? Is it important in humans?
It allows animals to track
No, it isn’t developed well in humans
True or false; CN 2 is afferent only?
True
True or false; the eyeball is composed of 4 layers
False, it is composed of 3
What are the 2 layers of the outermost layer of the eyeball called?
Sclera (white) and Cornea (clear)
Name the 3 parts of the middle layer of the eyeball
Ciliary body
Iris
Choroid
How many layers are there in the innermost layer of the eyeball?
10
How many types of cones are there in the eye?
3; red, green, and blue
Where do we have the clearest vision? What is more concentrated here?
Fovea centralis- more cones
True or False; there are no rods in fovea
True
The periphery of the retina is almost completely composed of what kind of cell?
Rods
When depolarized who do photoreceptors relay information to? Where is this?
Bipolar cells in outer plexiform layer
Where are bipolar cells in the CN 2 pathway typically found?
inner nuclear layer
In the CN 2 pathway, bipolar cells relay information to ganglion cells, the synapse occurs in what layer?
Inner plexiform layer
Where do the optic nerves enter the skull? What do they unite to form?
through optic canal
optic chiasma
Are optic nerve axons myelinated
Yes
What cells for myelin?
Olegodendrocytes
What two muscles are influenced by the tectospinal tract
SCM and Trapezius
True or false; the optic tract travels around the cerebral peduncles and fibers synapse on one of 3 nuclei or termination
True
What the nuclei or termination for most fibers in the optic tract?
Lateral geniculate body
Optic tract fibers synapsing on the superior colliculus tells you what muscles will be influenced?
SCM and Trapezius because part of the tectospinal tract
What is the third nuclei or termination for the optic tract? What kind of reflexes are they associated with
Pretectal nucleus of the midbrain
Fibers deal with light reflexes
True or false; you need both eyes functioning properly for good depth perception
True
True or False; CN 3 is only afferent in nature
False, it is only Efferent
CN 3 is a motor nerve supplying how many extra ocular muscles
5, CN 3 supplies all extra ocular muscles except superior oblique and lateral rectus