Interactive brain anatomy diagram with labeled parts to drag and match.

Let's solve this step-by-step by identifying the correct anatomical structures in the brain diagram and matching them with their corresponding labels.

We are given a sagittal section of the human brain (a side view cutting through the middle), and we need to drag each label from the list on the left to its correct location in the image.

---

Step 1: Understand the Brain Regions

Here’s a quick breakdown of the major structures:

1. Corpus Callosum – A large bundle of nerve fibers connecting the two hemispheres of the cerebrum; located above the thalamus, between the cerebral hemispheres.
2. Fornix – A C-shaped bundle of nerve fibers beneath the corpus callosum, involved in memory.
3. Thalamus – A relay center for sensory information; located below the corpus callosum and above the hypothalamus.
4. Pineal Body (Pineal Gland) – Small gland near the center of the brain, behind the thalamus; regulates sleep-wake cycles.
5. Superior Colliculi – Paired structures on the dorsal surface of the midbrain involved in visual reflexes.
6. Inferior Colliculi – Located below the superior colliculi; involved in auditory processing.
7. Cerebellum – Located at the back of the brain, below the cerebrum; coordinates movement and balance.
8. Pituitary Gland – Often called the "master gland"; hangs from the hypothalamus at the base of the brain.
9. Midbrain – Part of the brainstem; lies between the thalamus and pons; contains colliculi.
10. Pons – A bridge-like structure in the brainstem, above the medulla and below the midbrain.
11. Medulla Oblongata – The lower part of the brainstem, just above the spinal cord; controls vital functions like breathing and heart rate.
12. Spinal Cord – Extends downward from the medulla into the vertebral column.

---

Step 2: Identify Locations in the Diagram

Now let's go through the blank boxes and assign the correct labels based on anatomy.

#### Top of the Brain:
- The Corpus Callosum is the thick white band connecting the two cerebral hemispheres — it's visible as a curved white structure across the top of the cerebrum.
- Just below it, the Fornix arches down from the hippocampus toward the hypothalamus.
- Below that is the Thalamus, a large oval structure.
- Behind the thalamus is the Pineal Body — small, centrally located.
- The Superior Colliculi and Inferior Colliculi are paired bumps on the dorsal (back) side of the Midbrain.
- The Cerebellum is the folded structure at the back of the brain, below the cerebrum.
- The Pituitary Gland is a small lobe hanging down from the hypothalamus at the base of the brain.
- The Midbrain is the uppermost part of the brainstem, above the pons.
- The Pons is the bulbous structure in the brainstem, just above the medulla.
- The Medulla is below the pons, transitioning into the Spinal Cord.

---

Step 3: Match Labels to Blank Boxes

Let’s now match each label to its position in the diagram (top to bottom):

1. Top-left blank (curved white band): → Corpus Callosum
2. Just below Corpus Callosum, curving down: → Fornix
3. Below Fornix, large oval mass: → Thalamus
4. Behind Thalamus, small gland: → Pineal Body
5. On the dorsal midbrain, upper pair of bumps: → Superior Colliculus
6. Below Superior Colliculus, lower pair of bumps: → Inferior Colliculus
7. Back of the brain, folded structure: → Cerebellum
8. At the base, hanging down from hypothalamus: → Pituitary
9. Dorsal to pons, above medulla: → Midbrain
10. Bulbous structure in brainstem, above medulla: → Pons
11. Below pons, leading to spinal cord: → Medulla
12. Extending down from medulla: → Spinal Cord

---

Final Answer: Labeling the Diagram

From the image, here's how the blanks should be filled (from top to bottom, left to right):

1. Top center (between hemispheres): → Corpus Callosum
2. Left side, below Corpus Callosum: → Fornix
3. Center, below Fornix: → Thalamus
4. Right side, near top: → Pineal Body
5. Right side, below Pineal: → Superior Colliculus
6. Below Superior Colliculus: → Inferior Colliculus
7. Far right, posterior: → Cerebellum
8. Bottom center, below pons: → Medulla
9. Below Medulla: → Spinal Cord
10. Left side, below thalamus: → Pituitary
11. Below Pituitary: → Midbrain
12. Below Midbrain: → Pons

Wait — there are 12 blank boxes, but only 12 labels listed. Let’s re-check the image layout.

Actually, looking carefully:

The labels are:

- Corpus Callosum
- Fornix
- Thalamus
- Pineal Body
- Superior Colliculus
- Inferior Colliculus
- Cerebellum
- Pituitary
- Pineal Body (duplicate? Probably typo)
- Midbrain
- Pons
- Medulla
- Spinal Cord

Wait — Pineal Body appears twice. That’s likely an error in the list. But since it's listed twice, maybe it's a mistake.

But in reality, Pineal Body is one structure.

So probably the list has a duplication.

But assuming all labels are to be used once, we can proceed.

Let’s assume the list is:

1. Corpus Callosum
2. Fornix
3. Thalamus
4. Pineal Body
5. Superior Colliculus
6. Inferior Colliculus
7. Cerebellum
8. Pituitary
9. Midbrain
10. Pons
11. Medulla
12. Spinal Cord

(And the second "Pineal Body" is a duplicate — ignore or use only once.)

Now, let's assign:

- Top central white band → Corpus Callosum
- Curved structure under corpus callosum → Fornix
- Large oval structure below fornix → Thalamus
- Small gland behind thalamus → Pineal Body
- Two bumps on top of brainstem (dorsal) → Superior Colliculus (upper), Inferior Colliculus (lower)
- Folded structure at back of brain → Cerebellum
- Small lobe hanging down from base → Pituitary
- Brainstem region above pons → Midbrain
- Bulbous part of brainstem → Pons
- Below pons → Medulla
- Below medulla → Spinal Cord

---

Final Matching (by blank box position):

Assuming the blank boxes are labeled in order from top to bottom, left to right:

1. Top center (corpus callosum) → Corpus Callosum
2. Left side, below corpus callosum → Fornix
3. Center, below fornix → Thalamus
4. Right side, near top → Pineal Body
5. Right side, below pineal → Superior Colliculus
6. Below superior colliculus → Inferior Colliculus
7. Far right, posterior → Cerebellum
8. Bottom center, below pons → Medulla
9. Below medulla → Spinal Cord
10. Left side, below thalamus → Pituitary
11. Below pituitary → Midbrain
12. Below midbrain → Pons

Wait — that doesn't make sense because pons is above medulla.

Let’s reorganize based on actual anatomy.

Looking at standard sagittal views:

- Top: Corpus Callosum
- Below it: Fornix
- Below fornix: Thalamus
- Behind thalamus: Pineal Body
- Below thalamus, in midbrain: Superior Colliculus (top), Inferior Colliculus (bottom)
- Posterior to midbrain: Cerebellum
- Anterior to midbrain, base: Pituitary
- Below midbrain: Pons
- Below pons: Medulla
- Below medulla: Spinal Cord

So the blank boxes:

- Top center: Corpus Callosum
- Slightly below, left: Fornix
- Center, below fornix: Thalamus
- Right side, near top: Pineal Body
- Right side, below pineal: Superior Colliculus
- Below superior colliculus: Inferior Colliculus
- Far right, posterior: Cerebellum
- Bottom left, base: Pituitary
- Below pituitary: Midbrain
- Below midbrain: Pons
- Below pons: Medulla
- Below medulla: Spinal Cord

But wait — midbrain is not directly below pituitary. The pituitary is anterior (front), while midbrain is posterior and dorsal.

Better to think:

- Pituitary is at the base, hanging down.
- Midbrain is above the pons, posterior to the thalamus.
- Pons is below midbrain, in the brainstem.
- Medulla below pons.
- Spinal cord below medulla.

So the labels should be:

- Top center: Corpus Callosum
- Below it, curving down: Fornix
- Below fornix: Thalamus
- Behind thalamus: Pineal Body
- Dorsal midbrain (top bumps): Superior Colliculus
- Dorsal midbrain (bottom bumps): Inferior Colliculus
- Posterior to midbrain: Cerebellum
- Base of brain, hanging down: Pituitary
- Above pons, posterior: Midbrain
- Bulbous brainstem: Pons
- Below pons: Medulla
- Below medulla: Spinal Cord

So the final labeling is:

1. Top center → Corpus Callosum
2. Left side, below corpus callosum → Fornix
3. Center, below fornix → Thalamus
4. Right side, behind thalamus → Pineal Body
5. Right side, above cerebellum → Superior Colliculus
6. Below superior colliculus → Inferior Colliculus
7. Far right, posterior → Cerebellum
8. Bottom center, near base → Pituitary
9. Below pituitary, in brainstem → Midbrain
10. Below midbrain → Pons
11. Below pons → Medulla
12. Below medulla → Spinal Cord

Note: In some diagrams, Midbrain is shown as a single structure above the pons.

So yes, the sequence from top to bottom in the brainstem is:

- Midbrain → Pons → Medulla → Spinal Cord

And Pituitary is attached to the hypothalamus, which is below the thalamus.

So the correct assignments are:

| Blank Box Position | Label |
|--------------------|-------|
| Top center | Corpus Callosum |
| Left, below corpus callosum | Fornix |
| Center, below fornix | Thalamus |
| Right, behind thalamus | Pineal Body |
| Right, dorsal midbrain (top) | Superior Colliculus |
| Right, dorsal midbrain (bottom) | Inferior Colliculus |
| Far right, posterior | Cerebellum |
| Base, anterior | Pituitary |
| Above pons, posterior | Midbrain |
| Bulbous brainstem | Pons |
| Below pons | Medulla |
| Below medulla | Spinal Cord |

✔ All 12 labels used.

---

✔ Final Answer (Labeling):

1. Corpus Callosum – Top center
2. Fornix – Left, below corpus callosum
3. Thalamus – Center, below fornix
4. Pineal Body – Right, behind thalamus
5. Superior Colliculus – Right, dorsal midbrain (top bump)
6. Inferior Colliculus – Right, dorsal midbrain (bottom bump)
7. Cerebellum – Far right, posterior
8. Pituitary – Base, anterior
9. Midbrain – Above pons, posterior
10. Pons – Bulbous brainstem
11. Medulla – Below pons
12. Spinal Cord – Below medulla

> Note: The list includes "Pineal Body" twice — likely a typo. Use it only once.

---

This completes the labeling of the brain diagram.