0
Where is the part where the postganglionic fiber and the spinal nerve innervate glands in the body?
Wiki User
∙ 9y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Damage to this fiber type would lead to a loss of sensory function?
ventral root of a spinal nerve
Why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves?
The reason why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves is owing to nerve plexuses. These are networks of nerves all tangled together and found mostly in the limbs.
Why all of your nerve fiber are not large?
Nerve fibres (or axons) all join together in bundles to make larger 'nerves', i assume you mean ''why are all NERVES not all large'', and not nerve fibers, and by large i think you mean thick??? (sorry if i am wrong..) The largest nerves are just groups of nerve fibers that have joined together into one canal as they are all running down the same path e.g. down the arms and legs). As the nerve travels down its path, individual nerve fibers will leave the nerve canal and travel off on their own at some point to innervate different parts of the area (muscles, tissues etc..), and so the nerve decreases in thickness. Therefore the largest nerves (e.g the sciatic nerve) are only large because all the individual nerves coming off the spinal cord are joining together in one canal to travel down to the leg to innervate its different parts. As the nerve travels further down (ie. to the foot) the nerve gets much smaller as many of its fibres have already branched off to innervate the upper leg muscles etc. Therefore some nerves are only wide because they holds alot of nerve fibers within it. ..If you do mean, why are they not 'large' in relation to length, it is because some places needing innervating are closer to the spinal cord than others, and so they dont need to be as long!! (e.g. the kidney is closer to the spinal cord than the botton of the foot!!)
Do the spinal funiculi contain fiber tracts or neuronal cell bodies?
"The three funiculi contain many fiber tracts. Each fiber tract is composed of axons that have all similar destinations and functions."Citation:Marieb, Elaine N., Patricia Brady Wilhelm, and Jon Mallatt. Human Anatomy. Sixth Edition Media Update. San Francisco: Pearson Education Inc. , 2010. pg. 376.
Is silk a natural fiber or a synthetic fiber?
a natural fiber
The postganglionic sympathetic fiber originates from?
The postganglionic sympathetic fiber originates from PNS within a ganglion
Which neurons are classified as an adrenergic fiber?
The neuron classified as an adrenergic fiber is the sympathetic postganglionic neuron.
High repetition resistance training?
Does not innervate high threshold motor units and limits the potential for Type IIB muscle fiber hyper
Will fiber help your dogs anal glands?
No the vet needs to clean them out
Which of the following is not an ascending spinal cord nerve fiber tract?
reticulospinal
Damage to this fiber type would lead to a loss of sensory function?
ventral root of a spinal nerve
High repetition resistance training Innervates high threshold motor units?
Does not innervate high threshold motor units and limits the potential for Type IIB muscle fiber hyper
Fiber type in anterior ramus?
alpha spinal motor neuron axons leave the spinal column and enter the nerves via the ventral rami.
What is contained in the dermis?
in the dermis there is the hair shaft, the follicle, the oil and sweat glands, and the nerve fiber.
A fiber tract that provides for communication between the cerebrum and the CNS area?
If the fiber tract connects the cerebral cortex and the lower brain or spinal cord then it is referred to as a projection tract.
Why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves?
The reason why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves is owing to nerve plexuses. These are networks of nerves all tangled together and found mostly in the limbs.
Why are sympathetic responses generally widespread?
Sympathetic responses are more widespread because of the way the efferent nerves (from spinal cord outward) are positioned. The autonomic system has two neurons between its spinal cord and the organ that it is modulating whereas the somatic system has only one. The difference between the sympathetic and the parasympathetic is that in the case of sympathetic, the first nerve out of the spinal cord, called the preganglionic fiber is extremely short and ends relatively close to the spinal cord. Here, the preganglionic fiber synapses with on average of 10 postganglionic fibers which then moves onto effect a variety of different organs. On the other hand, in the parasympathetic division the preganglionic nerve are extremely long and extends until it is almost at the organ. From there, it synapses with a very short post-synaptic nerve that then synapses an organ. The ratio in this case can be about 1:3 but usually is 1:1. To sum things up, in the sympathetic division, the preganglionic fiber terminates very early and therefore has the "opportunity" to interact with a variety of nerves. On the other hand, the parasympathetic division has such a long preganglionic fiber that by the time it synapses its post ganglionic fiber, it is pretty much at the organ. NE and epinephrine are secreted into the blood as part of the sympathetic response.
