Central Nervous System Worksheet for students to learn brain and spinal cord anatomy.

Let's solve each part of the Central Nervous System Worksheet step by step and provide explanations.

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1. Fill in the blanks:

> The central nervous system (CNS) coordinates and controls all activities of the body. It allows us to respond rapidly to stimuli, or changes in the environment that causes a response. The brain has four main parts. It is enclosed in a skull. The spinal cord is protected by the vertebral column.

#### ✔ Explanation:
- Respond: The CNS enables quick reactions.
- Environment: External changes trigger responses.
- Response: The action taken by the body due to a stimulus.
- Four: The brain has four main parts: cerebrum, cerebellum, brainstem (which includes midbrain, pons, and medulla oblongata), and diencephalon (not listed here, but often grouped as major regions).
- Skull: Protects the brain.
- Vertebral column: Also known as the spine, protects the spinal cord.

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2. Label the diagram:

We are given a side view of the brain with lines pointing to different structures. The word list includes:

- Spinal cord
- Cerebellum
- Brain stem (Pons)
- Cerebrum
- Neuron

(Note: "Neuron" is a cell, not a visible structure in this diagram, so it’s likely not meant to be labeled on the diagram.)

#### Diagram Labels (from top to bottom):

1. Top large folded structure → Cerebrum
- Largest part of the brain; responsible for thinking, memory, voluntary movement.

2. Back lower part of the brain → Cerebellum
- Coordinates balance and fine motor control.

3. Middle region connecting brain to spinal cord → Brain stem (Pons)
- The pons is part of the brainstem; involved in relaying signals and regulating sleep and respiration.

4. Long structure extending down from brainstem → Spinal cord
- Carries messages between brain and body.

> ✘ "Neuron" is not labeled because it's a microscopic cell, not a macroscopic structure shown in this diagram.

#### ✔ Final labels:
- Top: Cerebrum
- Back lower lobe: Cerebellum
- Middle connection: Brain stem (Pons)
- Bottom extension: Spinal cord

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3. True or False:

Now evaluate each statement:

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a) The cerebellum is the largest part of the brain.
✘ False
→ The cerebrum is the largest part of the brain.

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b) The cerebrum controls all the involuntary actions.
✘ False
→ The cerebrum controls voluntary actions. Involuntary actions (like heartbeat, breathing) are controlled by the brainstem and medulla oblongata.

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c) Another word for brain stem is medula ablongada.
✔ True
→ "Medulla oblongata" is a part of the brainstem. While not the entire brainstem, it is commonly referred to in this context. (Note: "ablongada" is a typo — should be oblongata.) But assuming it's meant to be "medulla oblongata", it's acceptable.

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d) If a person has damage to cerebrum, they cannot remember.
⚠️ Partially true, but oversimplified
→ Memory involves multiple areas, especially the hippocampus (in the temporal lobe of the cerebrum). So yes, cerebrum damage can impair memory, but not *all* cerebrum damage affects memory. Still, the statement is generally true in many cases.

✔ True (with caveat)

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e) The left side of the brain controls the right side of the body.
✔ True
→ This is correct due to crossed neural pathways. The left hemisphere controls the right side, and vice versa.

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f) When blood flows to the brain a stroke occurs.
✘ False
→ A stroke happens when blood flow to the brain is blocked (ischemic stroke) or when a blood vessel bursts (hemorrhagic stroke). Normal blood flow does not cause a stroke.

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g) Drugs and alcohol can affect the cerebrum and the cerebellum.
✔ True
→ Alcohol impairs judgment (cerebrum) and coordination (cerebellum). Drugs like marijuana or opioids also affect both areas.

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h) The middle of the cerebrum controls memory.
✘ False
→ Memory is primarily processed in the hippocampus, which is located in the temporal lobe (side of the cerebrum), not the "middle." The corpus callosum connects the two hemispheres but doesn’t control memory. So this is false.

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✔ Final Answers – Section 3:

| Statement | Answer |
|---------|--------|
| a) The cerebellum is the largest part of the brain. | False |
| b) The cerebrum controls all the involuntary actions. | False |
| c) Another word for brain stem is medula ablongada. | True |
| d) If a person has damage to cerebrum, they cannot remember. | True |
| e) The left side of the brain controls the right side of the body. | True |
| f) When blood flows to the brain a stroke occurs. | False |
| g) Drugs and alcohol can affect the cerebrum and the cerebellum. | True |
| h) The middle of the cerebrum controls memory. | False |

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✔ Summary of Completed Worksheet:

#### 1. Fill in the blanks:
> The central nervous system (CNS) coordinates and controls all activities of the body. It allows us to respond rapidly to stimuli, or changes in the environment that causes a response. The brain has four main parts. It is enclosed in a skull. The spinal cord is protected by the vertebral column.

#### 2. Diagram Labels:
- Top: Cerebrum
- Back lower lobe: Cerebellum
- Middle: Brain stem (Pons)
- Bottom: Spinal cord

#### 3. True or False:
a) False
b) False
c) True
d) True
e) True
f) False
g) True
h) False

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Let me know if you'd like this formatted as a printable answer key!