Human muscular system diagram with labeled muscles for educational purposes.

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

We’ll look at each arrow and match it to the correct muscle name based on standard human anatomy for the muscular system. We’ll start from the top and work our way down, front view first, then back view.

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Front View (Left Figure):

1. Top left arrow pointing to forehead area → This is the *Frontalis* muscle (part of the epicranius). It raises eyebrows.
2. Arrow pointing to side of neck/shoulder area → This is the *Trapezius* (upper part visible from front) or possibly *Sternocleidomastoid*, but since it’s more lateral and shoulder-area, likely *Trapezius*. Wait — actually, looking again: the arrow points to the muscle that runs from neck to shoulder — that’s the *Trapezius*.
- But wait — there’s another arrow pointing to the chest area. Let’s reorganize.

Actually, let’s list all arrows clearly:

There are 6 boxes on the front figure:

- Box 1 (top left): points to forehead → Frontalis
- Box 2 (top middle): points to side of head/temporal area → Temporalis
- Box 3 (middle left): points to upper chest/shoulder → Pectoralis Major
- Box 4 (middle right): points to abdomen → Rectus Abdominis
- Box 5 (lower left): points to front thigh → Quadriceps Femoris (or just Quadriceps)
- Box 6 (middle right, smaller box near shoulder): points to deltoid area → Deltoid

Wait — let’s count the boxes again from the image description.

Actually, looking at the layout:

Front view has:
- Top row: two boxes → one to forehead, one to temple
- Middle row: three boxes → one to chest, one to abs, one to shoulder (deltoid)
- Bottom: one box to thigh

Back view has:
- Top: one box to back of neck/upper back → Trapezius
- Middle: one box to mid-back → Latissimus Dorsi? Or Erector Spinae? Actually, arrow points to lower back/gluteal region? Wait no — let’s map carefully.

Better approach: use standard labeling for this common worksheet.

This is a very common “Muscular System” labeling worksheet. The expected answers are usually:

Front View:

1. Frontalis (forehead)
2. Temporalis (side of head)
3. Pectoralis Major (chest)
4. Rectus Abdominis (abs)
5. Quadriceps (front thigh)
6. Deltoid (shoulder)

Back View:

7. Trapezius (upper back/neck)
8. Latissimus Dorsi (mid-back, wide muscle)
9. Gluteus Maximus (buttocks)
10. Hamstrings (back of thigh)
11. Gastrocnemius (calf)

Wait — how many boxes total?

Counting the empty boxes in the image:

Front: 6 boxes
Back: 5 boxes
Total: 11 boxes

So we need 11 muscle names.

Standard labels for such diagrams:

Front:

1. Frontalis
2. Temporalis
3. Pectoralis Major
4. Deltoid
5. Rectus Abdominis
6. Quadriceps Femoris

Back:

7. Trapezius
8. Latissimus Dorsi
9. Gluteus Maximus
10. Hamstrings
11. Gastrocnemius

But let’s match arrows precisely.

From typical worksheets like this (LiveWorksheets often uses standard sets):

Final matched labels:

Front Figure (left):

- Arrow to forehead → Frontalis
- Arrow to temple → Temporalis
- Arrow to chest → Pectoralis Major
- Arrow to shoulder cap → Deltoid
- Arrow to abs → Rectus Abdominis
- Arrow to front thigh → Quadriceps

Back Figure (right):

- Arrow to upper back/neck → Trapezius
- Arrow to mid-back (wide muscle) → Latissimus Dorsi
- Arrow to buttock → Gluteus Maximus
- Arrow to back of thigh → Hamstrings
- Arrow to calf → Gastrocnemius

Yes — that matches 11 labels.

Now, to present them in order as per the boxes’ positions.

Since the user didn’t specify numbering, I’ll list them as they appear from top to bottom, left to right, matching the visual flow.

But to be precise, let’s assign based on position:

Assume the boxes are filled in this order (as commonly done):

Front:

1. Top-left box → Frontalis
2. Top-middle box → Temporalis
3. Middle-left box → Pectoralis Major
4. Small middle-right box (near shoulder) → Deltoid
5. Lower-middle box (pointing to abs) → Rectus Abdominis
6. Bottom-left box (thigh) → Quadriceps

Back:

7. Top-right box (upper back) → Trapezius
8. Middle-right box (mid-back) → Latissimus Dorsi
9. Lower-right box (buttock) → Gluteus Maximus
10. Bottom-middle box (back thigh) → Hamstrings
11. Bottom-right box (calf) → Gastrocnemius

That covers all 11.

I’ll now write the final answer as a list corresponding to the boxes in order from top to bottom, left to right across both figures.

But since the problem doesn’t number the boxes, the best way is to provide the labels paired with their locations descriptively — however, the instruction says “solve the problem”, which implies filling the blanks.

In most such worksheets, students are expected to write the muscle names in the boxes. Since we can’t draw, I’ll list them in the order they would be filled if going left to right, top to bottom.

Alternatively, perhaps the safest is to list the 11 muscles in the order of the arrows as typically presented.

After double-checking with standard anatomy diagrams and common school worksheets:

✔ Final Correct Labels:

For the front-facing body:

- Forehead: Frontalis
- Temple: Temporalis
- Chest: Pectoralis Major
- Shoulder: Deltoid
- Abs: Rectus Abdominis
- Front Thigh: Quadriceps

For the back-facing body:

- Upper Back: Trapezius
- Mid Back: Latissimus Dorsi
- Buttocks: Gluteus Maximus
- Back of Thigh: Hamstrings
- Calf: Gastrocnemius

These are the standard terms used in middle/high school biology for this diagram.

Final Answer:
Frontalis, Temporalis, Pectoralis Major, Deltoid, Rectus Abdominis, Quadriceps, Trapezius, Latissimus Dorsi, Gluteus Maximus, Hamstrings, Gastrocnemius