Haversian canal is found in

Options

A. epiphysis of femur of mammals
B. diaphysis of humerus of mammals
C. internal ear of mammals
D. obturator foramen

Answer

**Step-by-Step Solution:**

1. **Understanding Haversian Canal**: The Haversian canal is a microscopic channel found in the bone matrix. It is crucial for the supply of blood and communication within the bone structure.

2. **Identifying the Options**: The question provides four options regarding where the Haversian canal can be found:
- Option A: Epiphysis of femur of mammals
- Option B: Diaphysis of humerus of mammals
- Option C: Internal ear of mammals
- Option D: Obturator foramen

3. **Analyzing Each Option**:
- **Option A (Epiphysis of femur)**: The epiphysis is the end part of a long bone, which is involved in growth. This area contains Haversian canals as it is part of the bone structure.
- **Option B (Diaphysis of humerus)**: The diaphysis is the shaft of the long bone. While it does contain bone tissue, it is not primarily where Haversian canals are emphasized.
- **Option C (Internal ear of mammals)**: The internal ear contains small bones (malleus, incus, stapes) but does not have Haversian canals as these are not long bones.
- **Option D (Obturator foramen)**: This is an opening in the pelvic girdle formed by the ischium and pubis, which does not contain Haversian canals.

4. **Conclusion**: Based on the analysis, the correct answer is **Option A: Epiphysis of femur of mammals**, as this is where Haversian canals are found.