Study of the anatomy and organization of the nervous system.

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425 views

What is the distance between the sciatic nerve and the colon at the closest point?

Is it possible that a full colon impinges on the sciatic nerve? Is there anything that physically separates the sciatic nerve from the colon?
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A request for an overview of the cranial nerves

Is there any resource that contains motor and sensory innervations, or pathways of all the twelve cranial nerves (i.e., cranial nerve I to XII)? I have found this book chapter on the cranial nerves, ...
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1answer
1k views

Difference between 'Orbit' and 'Globe' in eye anatomy?

What's the difference between 'Orbit' and 'Globe' in eye's anatomy. Do they refer to the same ? I encountered this in this text: ... ciliary ganglion, which is approximately 3 mm in size, and ...
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1k views

What is the mechanism of reflex arcs?

When a reflex arc occurs the signal from the receptor passes straight to the motor neuron instead of being passed onto the brain. This is a rather simplistic explanation, I was hoping to make it more ...
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1answer
64 views

Spinal cord injury bypass

When the spinal cord is damaged, the connection between the brain and some part of the body may be lost. To restore this connection, researches are considering either: Repairing the damaged area so ...
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1answer
4k views

Nerves, Neurons, Axons and Dendrites by Example

Here is a simple diagram of a neuron: A few (very closely related) questions: Where are receptors located (for pain, pressure, temperature, etc.): in the axon terminals or the dendrite tree? ...
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74 views

Why is the vermis of the cerebellum associated with speech?

I've found multiple sources claiming that damage or impairment as a result of alcohol to the vermis of the cerebellum results in speech impairment. I find this a bit surprising, since the only areas I ...
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1answer
93 views

What is the mechanism responsible for the 'delay' in delayed rectifier potassium channels?

I've been trying to find a comprehensive explanation concerning the nature of the 'delay' in neurons' delayed rectifier potassium channels. As it's written in my intro to neuroscience textbook, these ...
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78 views

Biology Experiment Data (Hodgkin-Huxley)

I'm doing research into the Hodgkin-Huxley Model from an electronics/mathematics perspective and I'm looking to find actual numerical results from experiments on squid axons. I want to compare the ...
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84 views

Organisms with the most extreme sensory capabilities? (sight, smell, sound) [closed]

Background It is quite mind boggling to imagine what it would be like to be missing sight, sound, touch, smell, taste etc. Question Which organism holds the record for most extreme sensory ...
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601 views

Does brain activity generate heat gradients in the brain?

I'm reading this article on guiding axon growth using temperature gradient, and it mentions that the trajectory of growth of neuron connections can be influenced by temperature gradients as little as ...
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4answers
2k views

Are neural connections one-way?

I'm trying to think about how two neurons communicate, typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. Is this depiction somewhat accurate, and if so, ...
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2answers
34 views

What is the difference between the neural tube and the dorsal ventral cord?

I was wondering what the difference is between the neural tube and the dorsal ventral cord. I know that the neural tube forms during embryonic development from the ectoderm layer that folds inwards. ...
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1answer
92 views

Is Circle of Willis unique to humans? [closed]

I understand that Circle of Willis is a circulatory anastomotic system that provided blood to the brain. I want to understand if this system is unique to humans or does it exist in other species or ...
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1answer
60 views

Specifics of decussation

Beginner question here: The definition of decussation I see is the crossing through the midline of a bunch of neurons. But I was wondering if there was a little more to it than this, because I'm ...
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1answer
72 views

How does the brain regulate its temperature?

I recently ran into a bio-physical paradox while trying to solve an engineering problem, using nature's way as a guide; namely the brain. I'm working on designing a totally new system of liquid/gas ...
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1answer
573 views

Is the motor cortex identical to the sensorimotor cortex?

As far as I understand, the primary motor cortex (M1) and primary sensorimotor (SM1) are notations for the same cortical area in the brain. Am I right that there is no dedicated motor cortex, and that ...
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1answer
23 views

Lateral corticospinal tract and termination

I'm studying the motor pathways of the brain and I'm a bit confused about how the lateral corticospinal tract descends. From Neuroanatomy: Text and Atlas by Martin,...
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1answer
97 views

Radial Basis Function Network (RBF Network)

In the Wikipedia article on radial basis function network, I didn't understand what was meant by "center vector for neuron i", in other words "center of the RBF units called also prototype".
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1answer
66 views

What would happen if nerves didn't have refractory period? [closed]

What would happen if nerves didn't have refractory period? And, what part of his nervous system or neurons are not needed?
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1answer
35 views

What information do bipolar cells encode?

Short version: I don't see what information on-centre bipolar cells are actually capturing. Longer: Actually, the question could be extended to on-centre retinal cells as well, but I'll focus on ...
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0answers
14 views

Could there be some safe, hypothetical way of turning on and of thermoregulation?

This is something I thought of with the whole artificial gill concept. Could a modification to the brain/nervous system allow a human to turn off their thermoregulation in air/water of the right ...
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0answers
13 views

Real unipolar neurons do indeed exist in human?

I studied that the unipolar neuron in human body are not really unipolar but they're pseoudounipolar neurons. On the other hand according to what I understood from wikipedia (neuron) there are real ...
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0answers
27 views

Why is the autonomic nervous system divided into parts? [closed]

Why would it be advantageous from an evolutionary perspective to develop parasympathetic and sympathetic systems?
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24 views

Evolutionary reasoning behind redundancy of CST and RuST

According to my neuro-anatomy class, both the Corsticospinal Tract (CST) and the Rubrospinal Tract (RuST) control upper limb movement. What the evolutionary reasoning behind this redundancy and the ...
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12 views

How were the synaptic areas identified in the somatic sensation pathways?

I'm studying the somatic sensation pathways in neuro-anatomy and I was wondering what was the experimental procedure for identifying the number and location of the synapses in these pathways? ...
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2answers
519 views

Can you disconnect sensation from the brain without destroying muscle functions?

I want to know if it would be possible for a surgeon to "shut off" a person's senses without causing paralysis of any kind. The person would have to maintain their ability to speak and move, but not ...
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2answers
250 views

Systemic sensory confusion?

Sometimes when a person gets touched on one part of the body they feel it else where and may think it came from a different part of the body. What causes this? Other examples are similar to why you ...
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1answer
207 views

What's the evolutionary reason behind decussation?

A bunch of stuff in the human nervous system decussates. Optical information inputs from the eyes cross over in the optical chiasm. Multiple sensory and motor pathways cross-over before ascending the ...
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1answer
19 views

What does it mean “specialized populations of neurons”?

I'm reading now the Campbell biology book (10th), and on page 1063 is written: In all but the simplest animals, specialized populations of neurons handle each stage of information processing. ...
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1answer
20 views

Are cortical columns restricted to somatosensory cortical sections?

From this previous question, it seems like evidence for the minicolumn organisation of the neocortex seems to be primarily based off observations around the sensory parts of the cortex, such as the ...
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1answer
29 views

Relation between trigeminal and facial nerve in sympathetic response

In my neuro-anatomy course notes I found that the facial nerve "uses" the trigeminal nerve to reach its targets. However, I have yet to find any diagram or reference that indicates how this is done. ...
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1answer
33 views

How does stimulus reach neural threshold?

I understand that when the stimulus into a neuron is greater than the threshold it triggers the action potential. Do all the contributing stimulus have to occur at the same time, or can they occur ...
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32 views

Where to go next with clustered C elegans neuronal time series

I'm doing some independent research with the C Elegans nervous system (with the OpenWorm project) and was looking for some guidance as to where I should go next. Right now, I'm dealing with calcium ...