Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
NPB 101
Lecture 8
| Question | Answer |
|---|---|
| What are the finiculi in the spine made out of?What is their purpose? | The finiculi are the tracts going up and down the spine that lead to the brain. At any point an afferent or efferent signal can be sent to or from the brane through these tracts. They have myelenated sheath which make them white matter. |
| Why are there two large bulges in the spine? | The two bulges at the top and bottom of the spine are there because they need to be large for the signals leading too and from the limbs |
| What are the horns in the spine for? What are they made out of? | These are the points at which the nerve fibers either enter or leave the spine pending on whether they are dorsal or ventral. They are made out of grey matter |
| What are dermatomes? | The individual sections of the skin |
| What is the use of the cerebral cortex and where is it located in the brain? | The cerebral cortex is located on the outer layers of the brain in the parietal lobe and it collects the individual sensory stimuli coming from the body |
| Which sensory receptors have a collection place in the cerebral cortex? | All of them. Receptors that are close to each other in the body are close to each other in the brain. Those that are more sensitive on the body have more area devoted to them in the brain. |
| What is a local reflex arc? | Where the signal is sent from the limb to the spine back to the limb |
| What is a cortico-spinal motor projection? | A signal track sent from the cortex back down to the spine that carries signals from the brain |
| Why are tendons needed in the body? | Muscles cannot retract by themselves, they need tendons to do that |
| What happens when the patellar tendon is struck? | The muscle underneath is pressed down and stretched and then contracts back to the normal position with a kick |
| What are intrafusal muscle fibers? | A bundle of muscle fibers with sensory nerves attached on top which trigger the contraction of the muscle |
| How do limbs like the leg respond to voluntary movement or stimuli? | The afferent signal responds to a response, which is sent up to the spinal cord. Once it hits the spinal cord two efferent signals are sent out: an excitatory and inhibitor. One contracts a muscle on one side of the limb, the other relaxes opposite muscle |
| What are the four interneurons and one afferent neuron that take affect when the legs move? | Two excitatory and two inhibitory interneurons, one for each leg, and one afferent signal that goes up to the brain and registers the movement |
| What is the corticospinal tract? | The portion of the brain that can be related to the skeletal muscles |
Created by:
24rory
Popular Biology sets