In which of the following structure cartilage is absent ?

Options

A. Tip of nose
B. External ear pinna
C. Between the cranial bones
D. Between the two adjacent bones of the vertebral column

Answer

To solve the question "In which of the following structures is cartilage absent?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to identify a structure where cartilage is not present. We need to evaluate each option carefully.

2. **Evaluating the Options**:
- **Option 1: Tip of the Nose**: The tip of the nose is made of hyaline cartilage. Therefore, cartilage is present here. This option is incorrect.

- **Option 2: External Ear Pinna**: The external ear, or pinna, is composed of elastic cartilage. Thus, cartilage is also present in this structure. This option is incorrect as well.

- **Option 3: Between the Cranial Bones**: The cranial bones are connected by sutures, which are fibrous joints. There is no cartilage present between these bones. This option is correct as it indicates the absence of cartilage.

- **Option 4: Between the Vertebral Bones**: Between the vertebral bones, we have intervertebral discs, which consist of fibrocartilage. Therefore, cartilage is present here. This option is incorrect.

3. **Conclusion**: After evaluating all the options, the correct answer is **Option 3: Between the Cranial Bones**, as this is the only structure listed where cartilage is absent.

### Final Answer:
**Option 3: Between the Cranial Bones**