Astragalus and calcaneum are present in

Options

A. Fore limb
B. Hind limb
C. Scapula
D. Clavicle.

Answer

**Step-by-Step Solution:**

1. **Identify the Bones in Question**: The question asks about the bones "astragalus" and "calcaneum".

2. **Understand the Location of These Bones**: Astragalus (also known as talus) and calcaneum (also known as the heel bone) are bones found in the ankle region.

3. **Determine Which Limb Contains These Bones**: The bones of the ankle are part of the hind limb in humans and many other animals. The hind limb consists of several bones including the femur, tibia, fibula, and tarsals.

4. **List the Components of the Hind Limb**: The hind limb includes:
- Femur (thigh bone)
- Tibia and Fibula (bones of the lower leg)
- Tarsals (ankle bones, including astragalus and calcaneum)
- Metatarsals (5 in number)
- Phalanges (14 in number, which are the digits)

5. **Confirm the Correct Option**: Since astragalus and calcaneum are specifically mentioned as part of the tarsal bones, and tarsals are part of the hind limb, the correct answer is that these bones are present in the hind limb.

6. **Eliminate Incorrect Options**:
- Forelimb: Contains different bones (humerus, radius, ulna).
- Scapula: This is the shoulder bone and does not contain these bones.
- Clavicle: This is the collar bone and also does not contain these bones.

7. **Final Answer**: Therefore, the correct option is the hind limb.

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