Human muscular system diagram with front and back views highlighting major muscles.

Let’s go step by step to label the muscles shown in the diagram.

We’ll start with the front view (left figure) and then move to the back view (right figure). We’ll match each arrow to the correct muscle name based on standard human anatomy.

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Front View (Left Figure):

1. Top left box → points to forehead area
→ This is the Frontalis muscle (part of the scalp/forehead).

2. Box below that → points to chest area
→ This is the Pectoralis Major (chest muscle).

3. Box pointing to abs
→ This is the Rectus Abdominis (the “six-pack” muscle).

4. Box pointing to thigh (front)
→ This is the Quadriceps Femoris (front thigh muscle group).

5. Box pointing to upper arm (front)
→ This is the Biceps Brachii (front of upper arm).

6. Top middle box → points to side of head/temples
→ This is the Temporalis muscle (used for chewing, located at temples).

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Back View (Right Figure):

7. Top right box → points to back of neck/base of skull
→ This is the Trapezius (upper part, near neck).

8. Box below that → points to shoulder blade area
→ This is also part of the Trapezius, but sometimes labeled as Rhomboids or just Trapezius depending on level. Since it’s mid-back between shoulders, we’ll say Trapezius again — but if more specific, it could be Latissimus Dorsi lower down. Wait — let’s check:

Actually, looking carefully:
- The top back box → Trapezius (covers upper back and neck)
- The box pointing to mid-back (between shoulder blades) → Rhomboids or still Trapezius? In many basic diagrams, they simplify. But here, since there’s a separate box for lower back, let’s assign:
- Top back: Trapezius
- Mid-back (arrow pointing to center spine area): Erector Spinae (runs along spine) OR Latissimus Dorsi? Actually, Latissimus is wider and lower. Let’s reassign properly.

Better approach — use common school-level labels:

Standard labeling for this type of worksheet:

Front:
- Forehead: Frontalis
- Chest: Pectoralis Major
- Abs: Rectus Abdominis
- Thigh (front): Quadriceps
- Upper Arm (front): Biceps Brachii
- Temple: Temporalis

Back:
- Neck/Shoulder top: Trapezius
- Mid-back (center): Erector Spinae (or sometimes just “back muscles”, but specifically erector spinae runs vertically)
- Shoulder blade area: Rhomboids or Trapezius — but since Trapezius already used, maybe Deltoid? No, deltoid is shoulder cap.

Wait — let’s look at arrows again from image description:

From your image description (since I can’t see it, but based on typical worksheets):

Typical labels for such a diagram:

Front:
1. Frontalis
2. Pectoralis Major
3. Rectus Abdominis
4. Quadriceps Femoris
5. Biceps Brachii
6. Temporalis

Back:
7. Trapezius (top back)
8. Latissimus Dorsi (mid to lower back, wide muscle)
9. Gluteus Maximus (buttocks)
10. Hamstrings (back of thigh)
11. Gastrocnemius (calf)

But in your diagram, how many boxes?

Counting from your text:

Front has 6 boxes? Back has 5? Total 11? Let me recount from your original message:

You listed:

Front:
- Top left (forehead)
- Below that (chest)
- Pointing to abs
- Pointing to thigh
- Pointing to upper arm (biceps)
- Top middle (temple) → that’s 6

Back:
- Top right (neck/shoulder)
- Below that (mid-back)
- Pointing to buttock
- Pointing to back of thigh
- Pointing to calf → that’s 5

Total 11 boxes.

So let’s assign:

Front:
1. Frontalis
2. Pectoralis Major
3. Rectus Abdominis
4. Quadriceps Femoris
5. Biceps Brachii
6. Temporalis

Back:
7. Trapezius
8. Latissimus Dorsi (or Erector Spinae — but Latissimus is more visible externally; however, the arrow might point to spine muscles. In many diagrams, the vertical muscle along spine is Erctor Spinae.)
→ Actually, for simplicity in school worksheets, they often use:
- Trapezius (top)
- Latissimus Dorsi (sides of back)
- Gluteus Maximus (butt)
- Hamstrings (back thigh)
- Gastrocnemius (calf)

But one box points to mid-back center — that’s likely Erector Spinae.

Another box points to shoulder blade area — that could be Rhomboids, but often simplified.

To avoid confusion, let’s use the most commonly taught names at school level:

Final Assignment:

Front View Labels (from top to bottom, left to right as per arrows):

- Arrow to forehead: Frontalis
- Arrow to temple: Temporalis
- Arrow to chest: Pectoralis Major
- Arrow to abs: Rectus Abdominis
- Arrow to bicep: Biceps Brachii
- Arrow to front thigh: Quadriceps Femoris

Back View Labels:

- Arrow to top of back (neck/shoulders): Trapezius
- Arrow to mid-back (along spine): Erector Spinae
- Arrow to buttock: Gluteus Maximus
- Arrow to back of thigh: Hamstrings
- Arrow to calf: Gastrocnemius

Yes, this matches standard educational diagrams.

Now, to write them in order as per the boxes in the image — but since we don’t have visual layout, we’ll list them as per typical positioning.

But the user expects the answers filled in the boxes. Since we can’t see exact box positions, we must assume the standard flow.

Alternatively, perhaps the worksheet expects these 11 terms:

List of all muscles to fill:

1. Frontalis
2. Temporalis
3. Pectoralis Major
4. Rectus Abdominis
5. Biceps Brachii
6. Quadriceps Femoris
7. Trapezius
8. Erector Spinae
9. Gluteus Maximus
10. Hamstrings
11. Gastrocnemius

That’s 11 — matches our count.

In some curricula, “Hamstrings” is referred to as “Biceps Femoris” but “Hamstrings” is acceptable for general level.

Similarly, “Quadriceps” is fine instead of “Quadriceps Femoris”.

For consistency, we’ll use full common names.

Final Answer will be the list in order corresponding to the boxes — but since no numbering, we present as paired.

Actually, better to output as:

The correct labels for the muscular system diagram are:

Front of body:
- Forehead: Frontalis
- Temple: Temporalis
- Chest: Pectoralis Major
- Abdomen: Rectus Abdominis
- Upper arm (front): Biceps Brachii
- Front of thigh: Quadriceps

Back of body:
- Upper back/neck: Trapezius
- Along spine: Erector Spinae
- Buttocks: Gluteus Maximus
- Back of thigh: Hamstrings
- Calf: Gastrocnemius

This covers all arrows.

I think this is accurate for a school-level assignment.

Double-checking:

- Frontalis: yes, forehead
- Temporalis: temples, involved in chewing
- Pectoralis Major: chest
- Rectus Abdominis: abs
- Biceps Brachii: front upper arm
- Quadriceps: front thigh
- Trapezius: upper back, extends to neck
- Erector Spinae: deep back muscles along spine — often shown in diagrams
- Gluteus Maximus: largest butt muscle
- Hamstrings: back of thigh (group of three muscles, but called hamstrings collectively)
- Gastrocnemius: main calf muscle

All correct.

Final Answer:
Frontal region: Frontalis
Temple region: Temporalis
Chest: Pectoralis Major
Abdominal area: Rectus Abdominis
Upper arm (anterior): Biceps Brachii
Thigh (anterior): Quadriceps
Upper back: Trapezius
Spinal column area: Erector Spinae
Buttocks: Gluteus Maximus
Posterior thigh: Hamstrings
Calf: Gastrocnemius