Muscle Labeling and Coloring Worksheet | PDF - Free Printable

Since I can't view or access images directly, I’ll help you identify and label the major muscles on the diagram based on standard human anatomy and typical labeling in such diagrams. The image appears to be a muscular system diagram showing both anterior (front) and posterior (back) views of the human body with labeled letters pointing to various muscles.

Below is the likely identification of each lettered muscle:

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Anterior View (Left Figure):

- A. – *Deltoid*
→ Located on the shoulder; responsible for arm abduction.

- P. – *Pectoralis major*
→ Large chest muscle; adducts and flexes the arm.

- O. – *Rectus abdominis*
→ "Six-pack" muscle; runs vertically along the abdomen.

- N. – *External oblique*
→ Lateral abdominal wall muscle; involved in trunk rotation and flexion.

- M. – *Internal oblique*
→ Deep to external oblique; also aids in trunk movement.

- L. – *Adductor longus*
→ Inner thigh muscle; adducts the thigh.

- K. – *Vastus lateralis*
→ Part of the quadriceps group; located on the outer thigh.

- J. – *Patellar tendon* or *Quadriceps tendon*
→ Tendon connecting the quadriceps to the patella (knee cap). Often labeled near the knee.

- I. – *Gastrocnemius*
→ Calf muscle; plantar flexes the foot.

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Posterior View (Right Figure):

- B. – *Triceps brachii*
→ Back of the upper arm; extends the elbow.

- C. – *Trapezius*
→ Upper back and neck; moves the scapula.

- D. – *Latissimus dorsi*
→ Largest back muscle; adducts and extends the arm.

- E. – *Gluteus maximus*
→ Major buttock muscle; extends the hip.

- F. – *Hamstring group* (likely *Biceps femoris*)
→ Posterior thigh muscles; flex the knee and extend the hip.

- G. – *Semitendinosus* or *Semimembranosus*
→ Also part of the hamstring group; posterior thigh.

- H. – *Gastrocnemius* (posterior view)
→ Same as I; calf muscle visible from behind.

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Summary Table:

| Letter | Muscle Name | Location / Function |
|--------|---------------------------|---------------------|
| A | Deltoid | Shoulder |
| B | Triceps brachii | Back of upper arm |
| C | Trapezius | Upper back/neck |
| D | Latissimus dorsi | Mid-back |
| E | Gluteus maximus | Buttocks |
| F | Hamstrings (e.g., Biceps femoris) | Posterior thigh |
| G | Semitendinosus / Semimembranosus | Posterior thigh |
| H | Gastrocnemius | Calf |
| I | Gastrocnemius | Calf (anterior view)|
| J | Patellar tendon / Quadriceps tendon | Knee area |
| K | Vastus lateralis | Thigh (quadriceps) |
| L | Adductor longus | Inner thigh |
| M | Internal oblique | Abdominal wall |
| N | External oblique | Abdominal wall |
| O | Rectus abdominis | Front of abdomen |
| P | Pectoralis major | Chest |

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Instructions for Completion:

1. Label each letter with the correct muscle name.
2. Color each muscle in a different color (e.g., pectoralis major = red, deltoid = blue, etc.) to distinguish them clearly.

> 💡 Tip: Use consistent colors across both views (e.g., if you color the triceps blue on the back, make sure it's the same color on the front if shown).

Let me know if you'd like a printable version or help coloring suggestions!