Educational diagram of the axial skeleton, including the skull and thorax, with labeled parts for learning.

Let's solve the two figures step by step based on the anatomical structures shown in Figure 5-3 (lateral view of the skull) and Figure 5-7 (anterior view of the bony thorax). We'll identify each labeled part, assign appropriate colors (as per instructions), and label the bone markings or structures.

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🔹 Figure 5-3: Lateral View of the Skull

#### Step 1: Identify and Label the Bones

We are given a list of bones to color and label:

- Frontal
- Parietal
- Mandible
- Maxilla
- Sphenoid
- Ethmoid
- Temporal
- Zygomatic
- Occipital
- Nasal
- Lacrimal

Now let’s match these to the numbered leader lines on the skull diagram.

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#### ✔ Labeling for Figure 5-3:

1. Frontal Bone – Located at the forehead region, above the eye sockets.
→ Label 1: Frontal

2. Parietal Bone – Forms the top and sides of the skull.
→ Label 2: Parietal

3. Maxilla – Upper jawbone; forms the upper teeth and part of the face.
→ Label 3: Maxilla

4. Temporal Bone – Side of the skull, houses the ear.
→ Label 4: Temporal

5. Occipital Bone – Back of the skull, contains foramen magnum.
→ Label 5: Occipital

6. Mandible – Lower jawbone.
→ Label 6: Mandible

7. Zygomatic Bone – Cheekbone.
→ Label 7: Zygomatic

> Note: The mandibular condyle is already labeled — it's the rounded projection of the mandible that articulates with the temporal bone.

Other bones like sphenoid, ethmoid, nasal, and lacrimal are not directly visible in this lateral view but may be implied in deeper regions.

But since the leader lines are only 7, we focus on those.

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#### 🎨 Color Coding Suggestions (Choose different colors):

| Bone | Suggested Color |
|-------------|-----------------|
| Frontal | Light Blue |
| Parietal | Yellow |
| Mandible | Red |
| Maxilla | Green |
| Sphenoid | Orange |
| Ethmoid | Purple |
| Temporal | Pink |
| Zygomatic | Brown |
| Occipital | Gray |
| Nasal | Teal |
| Lacrimal | Light Green |

Color the corresponding circles and bones accordingly.

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🔹 Figure 5-7: Anterior View of the Bony Thorax

#### Structures to identify:

- All true ribs
- Costal cartilages
- All false ribs
- Sternum

Now, examine the rib cage structure.

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#### ✔ Labeling for Figure 5-7:

8. All true ribs – Ribs 1–7, which attach directly to the sternum via costal cartilages.
→ Label 8: True Ribs (Ribs 1–7)

9. Costal cartilages – The flexible cartilage connecting the ribs to the sternum.
→ Label 9: Costal Cartilages

10. All false ribs – Ribs 8–12; do not attach directly to the sternum.
- Ribs 8–10 attach indirectly via the 7th costal cartilage ("floating" in some contexts).
- Ribs 11–12 are floating ribs.
→ Label 10: False Ribs (Ribs 8–12)

Also, the sternum is the central flat bone (breastbone).

→ You should also label the subdivisions of the sternum using leader lines.

The sternum has three parts:
- Manubrium – upper part
- Body – long central part
- Xiphoid process – small, cartilaginous tip at the bottom

So, you’ll need to add labels for:
- Manubrium
- Body
- Xiphoid process

But since the figure only has numbers 8, 9, 10, and the instructions say "label the subdivisions of the sternum indicated by leader lines", we assume there are additional unlabeled leader lines pointing to the sternum.

If there are no extra lines, then perhaps you must draw them yourself.

Assuming the following:

- One line points to the manubrium
- One to the body
- One to the xiphoid process

Label them accordingly.

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#### 🎨 Color Coding for Thorax:

| Structure | Suggested Color |
|-------------------------|-----------------|
| All true ribs | Blue |
| Costal cartilages | Light Green |
| All false ribs | Orange |
| Sternum | Red |

Color the coding circles and corresponding structures.

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✔ Final Answer Summary:

#### Figure 5-3: Lateral View of the Skull

| Number | Structure |
|--------|-------------------|
| 1 | Frontal |
| 2 | Parietal |
| 3 | Maxilla |
| 4 | Temporal |
| 5 | Occipital |
| 6 | Mandible |
| 7 | Zygomatic |

*(Note: The mandibular condyle is already labeled.)*

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#### Figure 5-7: Anterior View of the Thorax

| Number | Structure |
|--------|-----------------------|
| 8 | True Ribs (Ribs 1–7) |
| 9 | Costal Cartilages |
| 10 | False Ribs (Ribs 8–12)|

Subdivisions of the Sternum:
- Manubrium – top portion
- Body – middle and longest part
- Xiphoid process – small, inferior tip

Label these if leader lines point to them.

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📝 Instructions Recap:

1. Color each bone/structure using different colors.
2. Color the coding circles next to each name.
3. Label the leader lines with correct names.
4. For the sternum, add labels for manubrium, body, and xiphoid process.

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✔ Final Tips:
- Use consistent colors across both diagrams.
- Ensure labels are neat and legible.
- If you're filling out a worksheet, make sure to write clearly.

Let me know if you'd like a printable version or image annotations!