Animal physiology lab report mechanoreceptors of cockroach

How Cockroaches Work

Finally, it is important that you be able to access all of the tibial sensillae spines with a probe without bumping into the recording lead wires. Adjust the manipulator so that a simple movement of the joystick will proximally deflect the spine.

Be very careful using it, and make sure that the magnetic base is secure before adjusting it.

You should get a trace with a stable baseline and irregular high frequency activity. Because the cuticle of the roach serves as its exoskeleton, both the cuticle and the campaniform organs are distorted whenever a nearby joint flexes or extends.

Can you identify more than one distinct unit in some action potential trains that you are seeing. The next few steps are a bit tricky, so proceed carefully. Once a consistent signal is attained the experimental protocol can begin. The practical bottom line of all of this is that it is OK to put DC powered equipment, like the microscope light, inside the cage, but is is not OK to run an unshielded AC line into the cage.

Using the supplied PE tubing, blow on the cerci and observe the response. Clicck the button again to exit this display-only mode and resume recording and note that all of the intervening trace footage have disappeared. These dome-shaped structures are located near the joints of each leg, and monitor joint movement and position by responding to deformations of the cuticle itself.

Flip it over and cut off both hind legs as close to the body as possible. It is easy to elicit action potentials in these so-called giant neurons or giant fibers.

Click on the magnifying glass under the Window menu to produce a Zoomed image of the selection.

Click on the magnifying glass under the Window menu to produce a Zoomed image of the selection. Make sure that the cerci are completely free of liquid and not touching anything dish, pins, etc.

Retract the probe tip away from the slide area when you are finished. A properly grounded Faraday cage, augmented by your properly grounded body in front of the opening, largely shields the interior area from electromagnetic fields in the room.

Moving the spine distorts the base plate and stimulates the sensory neurons, however, the responses of the sensory cells are not typically directionally symmetrical. If a loud 'buzzing' noise is apparent 60 Hz noisethen the leads and ground connections need to be adjusted.

On the audio amplifier set the selector switch and button to Tuner. If you develop a set of symbols to code the responses on the map, be sure to indicate clearly what the symbol code is.

Do this 10 times and in your lab report present a histogram of the distribution of the conduction velocities. Click and drag to highlight in black a region that contains several APs. The hook-like tarsus also helps roaches climb walls and walk upside down on ceilings.

Convert the above plot to polar coordinates with deflection orientation plotted around the circle and intensity plotted as the distance from the origin. There should be some spontaneous activity in the ventral nerve cord, adjust the settings on the amplifier until this activity can be readily visualized on the oscilloscope and heard on the audio amplifier.

The ventral cord is located beneath two strap like longitudinal muscles that will have to be carefully cut away. A useful web page on the escape response of the American Cockroach.

How many neurons are there in the VNC each connective. Make sure that the black ground headstage wire lead is clipped onto the exposed gold jack of the green reference lead.

A06 Cockroach Ventral Nerve AP

Use the Vaseline-mineral oil mixture from a syringe to cover the hook electrode and nerve to isolate from CPS that you will be reapplying to keep the preparation moist. Again, it is essential that the cable, clips and pin not be able to move relative to each other, so as to not tear or pull out of the femur.

If not, good hunting. Such a change is translated into a change in the rate of production of action potentials in the sensory neuron s which service s the mechanoreceptor. They move back and forth to either speed the roach up or slow it down.

You should hear a soft hissing sound. One or two members of your group should follow through subsections A and B below to confirm these settings and to make sure that you understand what each cable is for and how you are going to accomplish the recording.

It might seem that the ideal response for a primary mechanosensory neuron would be to simply fire continuously whenever the spine is displaced, and to stop firing immediately when the spine returns to its original position.

Slip the loop over the tibia near its distal end and carefully draw it tight. Listen and look for any neural response. This also greatly simplifies the kind of electrode which we can use.

Electrode placement for ventral and cercal week 2 nerve recording. Do not confuse the nerve with the shiny, air-filled tracheal which runs through the center of the femur. Chapter 13 Recording Action Potentials From Cockroach Mechanoreceptors Tom Linder Department of Zoology NJ - 15 University of Washington Seattle, Washington Tom Linder received his Ph.D.

in comparative physiology from the University of Washington in His area of specialization is cellular neurophysiology. After postdoctoral work, he. Animal Physiology Lab Report; Animal Physiology Lab Report. Words Mar 30th, 7 Pages.

03 - 03 - Cockroach femoral tactile spine is a type I mechanoreceptors and it contains a single bipolar sensory neuron. At the base of the tactile spine, there are afferent neural sensory dendrites which are sensitive to signals.

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Neurophysiology Lab Course Recording From Cockroach Ventral Nerve I