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What is the function of the sensory nerve in the reflex act under your knee?
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What is the opposite of motor nerve?
A motor nerve falls under the category of efferent nerves, its opposite would be an afferent nerve, usually called a sensory nerve.
What is the function of a nerve ending?
At the end of a nerve, there is a synapse, which transfers the signal on to the next nerve until it reaches it's destination - ie. the brain or a muscle. Nerve endings are what we feel the world around us with. Nerve endings are in every part of your body and they are always sensing what is going on around you. They feel the chair against your bottom, the key board under your finger tips, etc.
Why would such a response be of significant value in pupillary reflex?
Clinical significance[edit]In addition to controlling the amount of light that enters the eye, the pupillary light reflex provides a useful diagnostic tool. It allows for testing the integrity of the sensory and motorfunctions of the eye.[1]Under normal conditions, the pupils of both eyes respond identically to a light stimulus, regardless of which eye is being stimulated. Light entering one eye produces a constriction of the pupil of that eye, the direct response, as well as a constriction of the pupil of the unstimulated eye, the consensual response. Comparing these two responses in both eyes is helpful in locating a lesion.[1][5]For example, a direct response in the right pupil without a consensual response in the left pupil suggests a problem with the motor connection to the left pupil (perhaps as a result of damage to the oculomotor nerve or Edinger-Westphal nucleus of the brainstem). Lack of response to light stimulation of the right eye if both eyes respond normally to stimulation of the left eye indicates damage to the sensory input from the right eye (perhaps to the right retina or optic nerve).[1]Emergency room physicians routinely assess the pupillary reflex because it is useful for gauging brain stem function. Normally, pupils react (i.e. constrict) equally. Lack of the pupillary reflex or an abnormal pupillary reflex can be caused by optic nerve damage, oculomotor nerve damage, brain stem death and depressant drugs, such as barbiturates.Normally, both pupils should constrict with light shone into either eye alone. On testing each reflex for each eye, several patterns are possible.[6]Optic nerve damage on one side: (Example in parens.: Left optic nerve lesion) The ipsilateral direct reflex is lost (Example: when the left eye is stimulated, neither pupil constricts, as no signals reach the brain from the left eye due to its damaged optic nerve)The ipsilateral consensual reflex is intact (because light shone into the right eye can signal to the brain, causing constriction of both pupils via the normal oculomotor nerves)The contralateral direct reflex is intact (because light shone into the right eye can signal to the brain, causing constriction of both pupils via the normal oculomotor nerves)The contralateral consensual reflex is lost (because light shone into the eye on the damaged side cannot signal to the brain; therefore, despite the right eye's motor pathway (oculomotor nerve) being intact, no signals from the left eye are able to stimulate it due to the damage to the sensory pathway (optic nerve) of the left eye)Oculomotor nerve damage on one side: (Example in parens: Left oculomotor lesion) The ipsilateral direct reflex is lost (Example: when the left eye is stimulated, only the right pupil constricts)The ipsilateral consensual reflex is lost (Example: when the right eye is stimulated, only the right pupil constricts)The contralateral direct reflex is intact (because light shone into both eyes can still signal to the brain, and the pupil on the undamaged side will still be able to constrict via its normal oculomotor nerve)The contralateral consensual reflex is intact (because light shone into the left eye can still signal to the brain via the normal optic nerve, causing attempted constriction of both pupils; the contralateral pupil constricts via its normal oculomotor nerve, but the ipsilateral pupil is unable to constrict due to its damaged oculomotor nerve)
Which cranial nerve is attached to the cerebrum?
The cranial nerves that are attached to the medulla oblongata are the glossopharyngeal, vagus, accessory and hypoglossal nerves. The glossopharyngeal nerve is the ninth cranial nerve that causes the tongue, throat, and parotid gland to function properly. The vagus nerve is the tenth cranial nerve which helps with motor production, mainly regarding the process of voice production. The accessory nerve is the eleventh cranial muscle whose only function is motor function, mainly regarding the trapezius and sternocledomastoid muscles. Lastly, the hypoglossal nerve is the twelfth cranial nerve which helps in the proper functioning of the muscles under the tongue.
What is cranial reflex?
A cranial reflex is a fast, involuntary response to a stimulus. It uses the brain stem as an integrating center (the brain receives sensory information and generates a response). This is contrasted to a spinal reflex, when the response is generated in the spinal cord itself, and the brain only finds out a reflex has occurred after the fact.An example of a cranial reflex would be the tracking movements of your eyes as you are reading this sentence. The dilation and contraction of your pupils in response to different levels of light is another cranial reflex.--------------An example of a spinal reflex would be standing on a pin or touching a hot object.
An in voluntary action under a stimulus?
A reflex
What kind of tissue is able to contract under the influence of nerve impulsestive can be applied to any function or disease of an animal involving the sense of smell?
tongue -
What kind of animal tissue is able to contract under the influence of nerve impulsestive can be applied to any function or disease of an animal involving the sense of smell?
tongue -
What kind of animal tissue is able to contract under the influence of nerve impulsestive can be applied to any function or disease of an animal involving sense of smell?
tongue -
What is the function of the nerve ending?
At the end of a nerve, there is a synapse, which transfers the signal on to the next nerve until it reaches it's destination - ie. the brain or a muscle. Nerve endings are what we feel the world around us with. Nerve endings are in every part of your body and they are always sensing what is going on around you. They feel the chair against your bottom, the key board under your finger tips, etc.
What happens during reflex actions?
The Reflex ArcIf you stand on something sharp then you move your foot very quickly. You don't have to think about it - it feels like it happens even before you feel the pain. This is because the process is a reflex and doesn't involve the brain.Receptors and EffectorsThe diagram shows someone stepping on a drawing pin. Receptors in the skin of the foot will register the fact that this has happened and will send a signal along a sensory neuron to the spinal cord. Inside the spinal cord an interneuron will transfer the nerve signal to another nerve cell. This cell is a motor neuron and it carries the signal to the muscles in the leg. The leg muscles will contract and, hopefully, the foot will be moved away from the source of pain. Each of the nerve cells are separated by synapses.The Patellar Reflex (or Knee-Jerk)You may have seen doctors on the television (or maybe it's happened to you) where they test someone's reflexes by tapping just under the kneecap (patella) with a small rubber hammer. If this spot is hit just right then it will cause some special sensory cells (called a muscle spindle) to send signals off to the spinal cord. The signal passes through the interneuron and then via a motor neuron to the quadriceps muscle. This causes the leg to kick forward. No matter how much you concentrate you cannot stop this from happening as it's a reflex action and doesn't involve the brain.did you know ...The Latin name for the common limpet is Patellavulgata. This is because the shell of the limpet does look a bit like a kneecap.
What is conditing reflex?
an acquired response that is under the control of a stimulus
