Chapter 7 Lab Assignment - Axial Skeleton Labeling | Download Free ... - Free Printable

The images provided show two views of the human skull with labels pointing to various bones and bone markings. The task is to verify that the labels are correctly placed and spelled, based on standard anatomical knowledge.

Let’s go step by step through each labeled part in both diagrams to check for accuracy.

---

First Diagram: Anterior View of the Skull (Front View)

Labels on the left side (from top to bottom):

1. Frontal bone – Correct. This is the forehead bone.
2. Parietal bone – Correct. Located behind the frontal bone, forming the sides and roof of the cranium.
3. Ethmoid bone – Correct. Located between the eyes, contributes to the nasal cavity and orbits.
4. Lacrimal bone – Correct. Small bone in the medial wall of the orbit; contains lacrimal fossa for tear ducts.
5. Zygomaticofacial bone – ❗️Incorrect term. Should be Zygomatic bone or Zygomatic process. “Zygomaticofacial” refers to a *foramen* (hole), not a bone. The label points to the cheekbone area — so it should be Zygomatic bone.
6. Perpendicular plate – Correct. Part of the ethmoid bone that forms the superior part of the nasal septum.
7. Inferior nasal concha – Correct. Curved bones inside the nasal cavity that help humidify air.
8. Vomer – Correct. Forms the inferior part of the nasal septum.
9. Mental foramen – Correct. Hole in the mandible where nerves and blood vessels exit.

Labels on the right side (from top to bottom):

1. Coronal suture – Correct. Joint between frontal and parietal bones.
2. Supraorbital foramen – Correct. Hole above the eye socket for nerve/vessel passage.
3. Optic foramen – Correct. Also called optic canal; allows optic nerve to pass into orbit.
4. Superior orbital fissure – Correct. Opening behind the orbit for cranial nerves and vessels.
5. Temporal bone – ❗️Misplaced. In anterior view, you don’t typically see much of the temporal bone except maybe the zygomatic process. The label here seems to point near the lateral orbit — possibly meant to indicate the zygomatic process of temporal bone, but as written, “Temporal bone” is too vague and slightly misplaced in this context. However, since the zygomatic arch is formed by temporal and zygomatic bones, it may be acceptable if referring to the contribution. But strictly speaking, in pure anterior view, the main visible part would be the zygomatic bone. Let’s flag this as potentially misleading.
6. Nasal bone – Correct. Bridge of the nose.
7. Orbit – Correct. Eye socket.
8. Inferior orbital fissure – Correct. Opening below the orbit connecting to pterygopalatine fossa.
9. Middle nasal concha – Correct. Part of ethmoid bone projecting into nasal cavity.
10. Infraorbital foramen – Correct. Below the orbit, on maxilla, for infraorbital nerve.
11. Maxilla – Correct. Upper jaw bone.
12. Mandible – Correct. Lower jaw bone.

→ So in first diagram, one clear error:
- “Zygomaticofacial bone” → should be Zygomatic bone

Also, “Temporal bone” label might be better specified or repositioned, but depending on interpretation, it could be accepted.

---

Second Diagram: Lateral/Anterolateral View of the Skull (Side-Front Angle)

This appears to be more of a lateral view with some anterior structures still visible.

Left-side labels (top to bottom):

1. Coronal suture – Correct. Between frontal and parietal.
2. Parietal bone – Correct.
3. Squamous suture – Correct. Between parietal and temporal bones.
4. Temporal bone – Correct. Visible on side of skull.
5. Lambdoid suture – Correct. Between parietal and occipital bones.
6. Occipital bone – Correct. Back/base of skull.
7. External acoustic meatus – Correct. Ear canal opening.
8. Mastoid process – Correct. Bony prominence behind ear.
9. Styloid process – Correct. Thin pointed projection from temporal bone.

Right-side labels (top to bottom):

1. Frontal bone – Correct.
2. Sphenoid bone – Correct. Butterfly-shaped bone at base of skull; visible in lateral view via its greater wing.
3. Lacrimal fossa – Correct. Depression in lacrimal bone for tear sac.
4. Nasal bone – Correct.
5. Zygomatic bone – Correct. Cheekbone.
6. Maxilla – Correct.
7. Mandible – Correct.

All labels in second diagram appear correct.

Wait — let’s double-check “Lacrimal fossa”. Yes, it’s located on the medial wall of the orbit, within the lacrimal bone. In this angled view, it's reasonable to show it.

Also, note: In the second diagram, the label “Sphenoid bone” points to the region just behind the orbit — which is accurate because the greater wing of the sphenoid forms part of the lateral orbital wall and temple area.

So only issue overall is in first diagram:
➡️ “Zygomaticofacial bone” is incorrect terminology. It should be Zygomatic bone.

Additionally, while “Temporal bone” in the first diagram isn't wrong per se, it’s minimally visible in true anterior view — but since the image shows an angled anterior view (you can see part of the side), it may be acceptable. Still, best practice would be to specify “zygomatic process of temporal bone” if labeling that specific ridge. But given the level of detail expected, we’ll focus on outright errors.

Another possible minor point: In first diagram, “Ethmoid bone” label points to the cribriform plate/upper nasal region — correct. But sometimes students confuse ethmoid with vomer or nasal conchae — here it’s properly placed.

Final verification: Spelling?

Check all spellings:

- Coronal suture ✔
- Supraorbital foramen ✔
- Optic foramen ✔
- Superior orbital fissure ✔
- Inferior orbital fissure ✔
- Middle nasal concha ✔
- Infraorbital foramen ✔
- Mental foramen ✔
- Squamous suture ✔
- Lambdoid suture ✔
- External acoustic meatus ✔
- Mastoid process ✔
- Styloid process ✔
- Lacrimal fossa ✔

All spellings are correct.

Only structural error:
“Zygomaticofacial bone” → should be Zygomatic bone

Note: There IS a structure called the “zygomaticofacial foramen” — a small hole on the zygomatic bone — but there is no “zygomaticofacial bone.” So this is definitely a mistake.

---

Therefore, after careful review:

✔ All other labels are anatomically correct and properly spelled.
✘ One correction needed: Replace “Zygomaticofacial bone” with “Zygomatic bone” in the first diagram.

Since the assignment says “label the bones and bone markings”, and assuming the student has already filled these in (as shown in red text), our job is to confirm correctness — and identify any mistakes.

But wait — looking again at the original image description: The user uploaded an image where the labels are ALREADY FILLED IN (in red). And the instruction was to “solve the problem accurately”.

Given that, perhaps the actual task is to evaluate whether the existing labels are correct — i.e., grade or correct them.

Based on that understanding, here’s what needs fixing:

---

Correction Required:

In the first diagram (anterior view), the label pointing to the cheekbone area currently reads:

> Zygomaticofacial bone

This is incorrect.

It should read:

> Zygomatic bone

*(Reason: “Zygomaticofacial” describes a foramen — a hole — not a bone. The bone itself is the zygomatic bone.)*

No other corrections are necessary. All other labels are correctly named and positioned.

---

Final Answer:
The only error is in the first diagram: "Zygomaticofacial bone" should be corrected to "Zygomatic bone". All other labels are accurate.