Biology 8 Lesson 44: Practice: Understanding the function (Relating to structure) of the spinal cord
1. Summary of theory
– Review content knowledge:
Lesson 43: General introduction to the nervous system
– Prepare specimens and tools:
+ Specimen: 1 frog
- Slaughter set, frog stand.
- HCl solution 0.3%, 1%, 3%.
- Cup of water, plate of watch glass.
- Absorbent cotton.
2. Practice Procedure
a. Learn the function of the spinal cord
– Brain destruction technique to have medullary frogs:
- Hold a frog in your left hand
- Thumb and middle finger hold along both sides of the frog’s body to the “axillary” level.
- The index finger is on the frog’s back
- The other 2 fingers hold the frog’s hind legs
- Hold the sharp needle in the right hand, place the needle close to the skin in the middle of the skull. Gently push the tip of the needle close to the skull (centre – a craniocervical fossa), straighten the needle and gently swirl (the frog has a masking reaction at first)
- Put the frog’s head on the ground, turn the needle towards the head to insert the needle into the brain
- Hang the frog on the stand (as shown below) and conduct experiments 1,3, 4, 5, 6, 7
Step 1: Conduct experiments 1,2,3.
- Observe the reactions, record the results
- Prediction of spinal cord function
Step 2: Experimental observation 4.5
- Record results
- State the purpose of the experiment
Step 3: Experimental observation 6.7
- Record the results
- Draw conclusions
b. Studying the structure of the spinal cord
The spinal cord consists of gray matter in the middle and white matter around it:
+ Gray matter is the basis of unconditioned reflexes
White matter is the transmission lines that connect the bases in the spinal cord to each other and to the brain.
3. Report results
The groups take turns to evaluate the performance report
FIND OUT THE FUNCTION (RELATED TO STRUCTURE) OF THE LIFETIME
First and last name ………….
After completing this lesson, you should be able to fulfill the following requirements:
+ Successfully conduct the specified experiments
From the observed results:
- State the functions of the spinal cord and
- Predict the structural components of the spinal cord
- Compare the structure of the spinal cord through the drawing to confirm the relationship between structure and function