The canals that interconnect haversian canals and with marrow cavity  

Options

A. canaliculi
B. lacunae
C. volkmann's canals
D. all the above

Answer

To answer the question regarding the canals that interconnect Haversian canals with the marrow cavity, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Haversian Canals**:
- Haversian canals are microscopic tubes located in the outermost region of the bone. They contain blood vessels and nerves that supply nutrients to the bone cells (osteocytes).

2. **Identifying the Components**:
- Haversian canals are surrounded by concentric layers of lamellae, which are plate-like structures that provide support and structure to the bone.

3. **Explaining Lacunae**:
- Lacunae are small spaces located between the lamellae where osteocytes reside. They do not directly connect Haversian canals to the marrow cavity.

4. **Understanding Canaliculi**:
- Canaliculi are tiny channels that connect osteocytes to Haversian canals, allowing for communication and nutrient exchange. However, they do not connect Haversian canals to the marrow cavity.

5. **Identifying Volkmann's Canals**:
- Volkmann's canals (or perforating canals) are channels that run perpendicular to Haversian canals. They interconnect Haversian canals with each other and also connect to the marrow cavity, facilitating the transport of blood vessels and nerves.

6. **Conclusion**:
- The correct answer to the question is Volkmann's canal, as it is specifically responsible for interconnecting Haversian canals with the marrow cavity.

### Final Answer:
The canals that interconnect Haversian canals with the marrow cavity are called **Volkmann's canals**.

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