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407 > Lab 8 Nerve > Flashcards

Lab 8 Nerve Flashcards

1
Q

Equipment required for this lab?

A
  1. EM-220 Event marker
  2. IXTA, USB cable, IXTA power supply
  3. Computer
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2
Q

How to set up the event marker

A

Plug connector to EM-220 event marker into the EM1 Channel input on IXTA

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3
Q

What is ex 1 called

A

RXN TIME and VISUAL SIGNALS

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4
Q

What is the aim of ex 1

A

To MEASURE the RXN TIME of a SUBJECT to a VISUAL SIGNAL

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5
Q

Procedure for exercise 1 rxn time and visual signal

A
  1. Subject sitting on chair in front of comp
  2. Subject will watch right side of comp screen and press EM-220 event marker when signal (BLACK LINE) appears on comp screen
  3. Another student outside of subject’s sight should prepare to quietly press and release F1 key to generate the black line. Signals should not be less than 3 seconds nor more than 6 secs apart
  4. Perform 10 TRIALS
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6
Q

What is ex 2 called

A

RXN TIME and AUDITORY SIGNALS

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7
Q

Aim of ex 2

A

To MEASURE the RXN TIME of a SUBJECT to an AUDITORY SINGAL

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8
Q

Procedure for ex 2 rxn time and auditory signals?

A
  1. COVER comp screen to prevent subject from seeing any signal on screen as a visual signal OR have subject turn away from screen OR close their eyes
  2. Subject sit in chair near comp, but should not see screen.
  3. Tell subject to press EM-220 event marker when they hear signal
  4. Out of subject’s sight, another student prepare to LOUDLY tap (so subject can hear) and press and release F1 key on keyboard to generate black line on screen.
  5. Press F1 key loudly 10 times (10 auditory signals). They should not be less than 3 seconds and no more than 6 seconds apart
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9
Q

Equipment required for ex 3 achilles tendon reflex

A
  1. B3G ECG cable and electrode lead wires
  2. Disposable EMG electrodes
  3. PRH-200 patellar reflex hammer
  4. Measuring tape
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10
Q

What is ex 3 called

A

ACHILLES TENDON REFLEX

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11
Q

Aim of ex 3 achilles tendon reflex

A

To DETERMINE the CONDUCTION TIME from TENDON TAP to RESPONSE of the GASTROCNEMIUS MUSCLE in the ACHILLES TENDON REFLEX ARC

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12
Q

Time for ex 3

A

20 mins

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13
Q

Procedure for ex 3 achilles tendon reflex

A
  1. Clean w/alcohol 3 regions on CALF of LEFT leg for electrode attachment. One area near ANKLE, second is in the MIDDLE of CALF muscle, and third area ~8cm BELOW BACK OF KNEE.
  2. Apply electrodes to cleaned areas
  3. Attach 3 colour-coded electrode leads onto disposable electrodes so that
    - RED (+1) lead to electrode near BACK of KNEE
    - BLACK (-1) lead to electrode MIDDLE of CALF muscles
    - GREEN (C) lead wire to electrode on ankle that fxns as GROUND
  4. Subject SIT on lab BENCH so thighs are supported by top of bench and CALVES HANG FREELY
  5. Tap achilles tendon with POINTY END of reflex HAMMER a few times to locate point on tendon that produces consistent contraction of gastrocnemius muscle and downward movement of foot (plantar flexion)
  6. Click record. Instruct subject to move foot up and down to demonstrate the EMG that occurs w/plantar flexion and dorsiflexion.
  7. TAP ACHILLES TENDON to elicit stretch reflex.
  8. Record 5 TRIALS with same tapping force
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14
Q

Conduction velocity eqn?

A

Conduction velocity (m/s) = total path length (mm) / [mean reflex time(ms) - 0.5ms]

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15
Q

What is ex 4 called

A

Patellar tendon (knee jerk) reflex

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16
Q

Aim of ex 4 patellar tendon (knee jerk) reflex

A

To determine CONDUCTION TIME from TENDON TAP to RESPONSE of QUADRICEPS MUSCLE in PATELLAR TENDON REFLEX ARC

17
Q

Time for ex 4

A

20 mins

18
Q

Procedure for ex 4

A
  1. Subject sit on bench so thighs suspended on top of bench and calves hanging freely
  2. Clean w/alcohol 3 regions on THIGH of LEFT leg for electrode attachment. One area near KNEE, second is in the MIDDLE of THIGH muscles, and third area ~8 inches above the second
  3. Apply disposable electrodes to cleaned areas.
  4. Attach
    - BLACK (-1) LEAD to electrode ~12cm from KNEE
    - RED (+1) LEAD to electrode 8cm above black electrode, thus 20cm from knee
    - GREEN (C) lead to electrode on knee and fxns as GROUND
  5. Feel position of PATELLAR TENDON BELOW KNEECAP. Place one hand on patellar tendon and other hand to tap tendon w/reflex hammer. Find point on tendon that causes greatest response from QUAD muscles
  6. Record. Then ask subject to raise his lower leg to demonstrate EMG that occurs during QUAD contraction and relaxation
  7. Subject RELAX QUADS as exercise begins
  8. Subject perform JENDRASSIK MANEUVER so they don’t anticipate tap. Tension in quads = nosy EMG
  9. Tap subject’s patellar tendon to elicit stretch reflex
  10. Record 5 TRIALS using same tapping force
19
Q

What is the jendrassik maneuvar

A

Close eyes, grasp hands together at middle of thorax, and contract isometrically as if trying to pull hands apart
- raises lvl of activation of CNS

20
Q

Equipment for ex 5

A
  1. iWire-B3G cable and EMG lead wires
  2. 7 disposable snap electrodes
  3. HV stimulator lead wires
  4. FT-220 hand dynanometer
  5. Tennis ball
21
Q

Set up steps for person A

A
  1. Remove all jewelry from right arm
  2. Clean areas where electrodes attached
  3. Obtain 3 disposable electrodes
  4. Locate areas on FOREARM; place electrodes over these locations and attach coloured recording leads
    - BLACK (-1) electrode below CREASE OF ELBOW, slightly LATERAL of MIDLINE
    - RED (+1) electrode on MID-FOREARM, slightly LATERAL
    - GREEN (GROUND) btwn red and black electrodes
  5. Person A should hold TENNIS BALL or squeezable object
22
Q

Set up steps for person B

A
  1. Obtain 2 disposable electrodes
  2. Clean inside WRIST of NON-DOMINANT ARM w/alcohol
  3. Snap ends of H.V. Output lead wires onto electrodes so that
    - RED (+1) lead snapped onto electrode on LATERAL EDGE of INSIDE of WRIST
    - BLACK (-1) lead snapped onto electrode on MEDIAL EDGE of INSIDE of WRIST
  4. Person B lightly cup FT-220 hand dynanometer in palm of their hand, trying not to hold on to it too tightly (just resting in their grip)
23
Q

What is ex 5 called

A

Human to human muscle control

24
Q

Aim of ex 5 human to human muscle control

A

to determine the EFFECT of a “SQUEEZE” by Person A on Person B’s response

25
Q

Time for ex 5

A

30 mins

26
Q

Procedure for ex 5

A
  1. Person A hold tennis ball in hand. Lay hand on bench with PALM UP. Not squeezing ball, their hand and forearm COMPLETELY RELAXED.
  2. Person B sit quietly with hand lightly cradling hand dynanometer. Use slight pressure from fingers to hold sensor.
  3. Person A squeeze ball or curl hand towards wrist. QUICK, FIRM RXN
  4. Person A squeeze ball or flex hand 5 TIMES. Person B should have a response each time person A flexes or squeezes.

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