Bio qustion

[osimsDDS]

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quick bio question:

Autonomic and somatic nervous systems both have sensory and motor neurons???

Are interneurons associated with the autonomic nervous system since they are related in the reflex arc stimulus? If not do they just direct sensory to motor and vis vera in the spinal cord???

thanks

 

[PooyaH]

quick bio question:

Autonomic and somatic nervous systems both have sensory and motor neurons???

Are interneurons associated with the autonomic nervous system since they are related in the reflex arc stimulus? If not do they just direct sensory to motor and vis vera in the spinal cord???

thanks

With reflex arc, I know that it is connected to a rapid motor response, and it's for quickness and protection. The sensory nerve directs a signal to the CNS and synapses with an interneuron in the spinal cord. And then that synapses with with a motor neuron that delivers the response signal to wherever caused the sensory reaction started (your hand or arm) which makes you move your hand quickly and involuntarily. So I'd say interneurons are associated with autonomic nervous system.

 

[DRHOYA]

Yeah, they both have sensory nerves. Think about it, in the somatic nervous system, you respond to touch via sensory nerves synapsing with brain cells which then synapse with motor neurons. In the autonomic nervous system you must also have sensory. When the phrenic nerve stimulates the diaphram to contract during breathing......it does so b/c sensory machinery signals a high CO2 concentration. Same with the heart......the SA node senses the end systole of verntricles, and sends info to motor neurons which cause the atria to undergo systole. Interneurons are usually found in the spinal cord, or in synapses that send info from sensory to motor. As far as which particular circuits have interneurons, I am not so sure. Reflex arcs have them. Hope that helps.

 

[ineffable11]

Question seems like destroyer Bio #49.

According to the answer, Yes, both autonomic and somatic nervous systems have sensory and motor neurons. And Reflex Arc is associated is internerons.

 

[jay47]

quick bio question:

Autonomic and somatic nervous systems both have sensory and motor neurons???

Are interneurons associated with the autonomic nervous system since they are related in the reflex arc stimulus? If not do they just direct sensory to motor and vis vera in the spinal cord???

thanks

Yes, both have sensory and motor neurons.

However, the answer to the interneuron question is more complicated.
In general, autonomic and somatic nerves will have interneurons, or else how would the information get to the brain from the spinal cord?

Sensory and motor neurons (somatic nerves) (such as those in a reflex arc) are located in the body and in the spinal cord.

However, only some autonomic nerves are located in the spinal cord. Sympathetic nerves originate in the thoraculumbar region, whereas parasympathetic originate in the craniosacral regions.

Interneurons will always be located in the spinal cord, so for somatic, sympathetic, and sacral regions of the parasympathetic nervous systems, interneurons will be in the spinal cord. However, interneurons in the cranial portions of the parasympathetic nervous system (e.g. the vagus nerve) will originate in the brainstem, effectively "bypassing" an interneuron.

However, this is way more than I would think you may have to know for the DAT.

 

[HoangDDS]

quick bio question:

Autonomic and somatic nervous systems both have sensory and motor neurons???

Are interneurons associated with the autonomic nervous system since they are related in the reflex arc stimulus? If not do they just direct sensory to motor and vis vera in the spinal cord???

thanks

Somatic nervous sys. (SNS)
- responsible for voluntary movement (skeletal muscles)
- contain both afferent (sensory) and efferent (motor) neurons.
- like the previous poster said, SNS has to contains interneuron in order to relay info towards and away from the CNS. Even in reflex arcs there are interneurons. (ex, knee tap: afferent neurons sends signal to the spinal cord through the dorsal root ganglion which synapses to a short interneuron which synapses on to a an efferent motor neuron which goes out the ventral horn and innervate the quad to jerk the knee)

Autonomic (ANS) -
- involuntary responses which acts on smooth muscles, cardiac muscles, and endocrine tissues
- 2 major division
-sympathetic - acts on target organs that prepares the body for "fight for flight"
-parasympathetic - same as above but prepares the body for "rest and digest"
- contains even more interneurons than SNS, b/c this is a more complicated system with more target or effector organs.

I'm sorry, i know you didn't asked for all of this, but it was the way to answering your question.

Good luck studying!

 

[Mstoothlady2012]

Yes, both have sensory and motor neurons.

However, the answer to the interneuron question is more complicated.
In general, autonomic and somatic nerves will have interneurons, or else how would the information get to the brain from the spinal cord?

Sensory and motor neurons (somatic nerves) (such as those in a reflex arc) are located in the body and in the spinal cord.

However, only some autonomic nerves are located in the spinal cord. Sympathetic nerves originate in the thoraculumbar region, whereas parasympathetic originate in the craniosacral regions.

Interneurons will always be located in the spinal cord, so for somatic, sympathetic, and sacral regions of the parasympathetic nervous systems, interneurons will be in the spinal cord. However, interneurons in the cranial portions of the parasympathetic nervous system (e.g. the vagus nerve) will originate in the brainstem, effectively "bypassing" an interneuron.

However, this is way more than I would think you may have to know for the DAT.

👍 Really good answer

Yes both ANS & PNS have sensory & motor neurons

PNS have interneurons
Sympathetic (cervical, thorarcic, lumbar) division has interneurons
Parasympathetic (cranial & sacral) only sacral ones have interneurons