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Nervous System
This category is for questions about the mechanical and chemical process of reactions to internal and external stimuli, ranging from the brain down to the spinal cord, and all nerves, cells and tissues in between.
3,047 Questions
Where does phantom limb pain occur in the body?
The abnormal "phantom" sensations and pain are usually located in the distal parts of the missing limb. Pain and tingling may be felt in the fingers and hand, and in the lower limbs, in the toes and the feet.
What is a true statement about smell?
The olfactory bulb inside the nose that detects smells is actually a part of the brain itself, not a separate sense organ like the other four senses use: taste (tongue), vision (eyes), hearing (ears), touch (skin).
the sympathetic division
neurotransmitters
How much oxygen and glucose can the brain store for emergency situations?
- The brain cannot store oxygen. A person can feel a lack of oxygen after only a few seconds. When someone stands up too quickly and becomes dizzy, this is an example of the loss of blood flow to the brain that can be sensed.
- The brain cannot store glucose (blood sugar). Diabetics who give themselves too much insulin can drop their blood sugar level and faint, and without immediate glucose infusion the brain can die.
A reflex is a quick involuntary action. There are five steps to a reflex: the stimulus occurs, the sensory neurons sense the stimulus, it sends a message to your spinal cord (it doesn't reach the brain right then), the spinal cord sends a message to your motor neurons, and the reflex occurs. While this is happening, the message goes on to your brain, which is why you feel the pain slightly after you jerk your hand out of the hot tub.
A reflex is an involuntary response to a stimuli
Blinking, Gagging, and Coughing, are examples of reflexes. In Infants, there are reflexes called Moro, rooting, and sucking.
Many of the reflexes of infants are lost as they grow older. For example, sucking from a nipple for food is different than using a straw. Use of the straw is not response to stimulus, and therefore not a reflex.
Reflexes follow a Reflex ARC. The Arc is through the spinal cord. While the information gets sent to the brain (you know you touched something hot, or you are choking and coughing), the reflex totally by-passes the brain. A reflex arc starts at the point of stimulation, goes to the spinal cord, and the return arc is the action. It saves time. Reflexes are protective. For instance: Touching a hot stove. You touch it, and the response is an immediate reflex to withdraw. It didn't go to your brain for you to think about. The arc was at the spinal cord for faster response time.
What does the autonomic nervous system not control?
The autonomic nervous system controls the involuntary processes of the body (heart rate, blood pressure, involuntary breathing, parastalsis and intestinal movement, etc.).
It does not control voluntary central nervous system functions, such as movement (motor control), sensation, and executive functions (thinking of something and then doing it).
What is a disease of the nervous system resulting from thiamin deficiency?
That disease is called as Korsakoff's psychosis. (I had an opportunity to face one such patient. A chronic alcoholic patient was admitted in the side room some 25 years back. He broke the glass bottle of saline and stabbed himself in the abdomen. Fortunately the wound did not penetrate the abdominal wall. He said that police has carried his wife away and he does not want to survive. Meantime his wife came. She said that nothing like that happened. He insisted her to tell the truth. The patient rapidly responded to injection thymine 100 mg, twice a day. Since then only I realized the importance of multivitamin supplementation in debilitated patients.)
he trochlear nerve (the fourth cranial nerve, also called the fourth nerve, IV) is a motor nerve (a "somatic efferent" nerve) that innervates a single muscle: thesuperior oblique muscle of the eye.
The trochlear nerve is unique among the cranial nerves in several respects. It is the smallest nerve in terms of the number of axons it contains.
What are the organs of taste and the cranial nerves connected to them?
The organs of taste are the taste buds. These are mostly located on the tongue but they are also present on roof of the mouth and the inside of cheeks, and a few are located in the lower pharynx (Throat) and epiglottis. There are two main pairs of cranial nerves associated with taste which transmit information from the tongue - the facial nerve (VII) and the glossopharyngeal nerve (IX) The vagus nerve (X) also transmits information from the few taste buds in the epiglottis and lower pharynx
How does weber's law work using the sense of hearing?
Weber's Law states that changes in a stimuli that are noticeable on a small scale are a constant ration of the original stimulus. Therefore, the law is often used in hearing studies to perceive the pitches and tones that the individual is able to hear. It measures what the ear is able to detect.
Why waveform of electromyogram is irregular?
Shape varies with:
- electrodes used
- location with respect to muscle fiber
- electromechanical properties of muscle & connective tissue
- recording equipment
Does the nervous system works through the secretion of neurons?
Yes. This is usually compared to the endocrine system, which works through secretion of hormones.
Depends on what kind of stitch.
Medical stitches: Go skateboarding. That usually does the trick.
Clothing stitches: Same thing, but wear long clothes
Side stitch: Spend years consuming Twinkies and playing WOW, attempt marathon.
Stitch from Lilo and Stitch: Go to Disneyland, buy plush.
Which site discusses the Viva Las Vagus Nerve?
The Viva Las Vagus Nerve is a type of nerve discussed on many different sites. One of the best sources that discusses the nerve is subtleyoga, which gives a full description of it.
Which neuron function is most likely affected by diisopropyl flurophosphate?
Synaptic Transmission...concerns impulse condution
