Total number of vertebra in Man `:-`

Options

A. 30
B. 26
C. 40
D. 35

Answer

To determine the total number of vertebrae in humans, we can break it down into the different types of vertebrae present in the human spine. Here’s a step-by-step solution:

### Step 1: Identify the Types of Vertebrae
Humans have five different types of vertebrae:
1. Cervical vertebrae
2. Thoracic vertebrae
3. Lumbar vertebrae
4. Sacral vertebrae
5. Coccygeal vertebrae

### Step 2: Count Each Type of Vertebrae
- **Cervical vertebrae**: There are 7 cervical vertebrae (C1 to C7).
- **Thoracic vertebrae**: There are 12 thoracic vertebrae (T1 to T12).
- **Lumbar vertebrae**: There are 5 lumbar vertebrae (L1 to L5).
- **Sacral vertebrae**: There are 5 sacral vertebrae, but they fuse to form 1 sacrum.
- **Coccygeal vertebrae**: There are 4 coccygeal vertebrae, which fuse to form 1 coccyx.

### Step 3: Calculate Total Vertebrae
Now, let's add them up:
- Cervical: 7
- Thoracic: 12
- Lumbar: 5
- Sacrum: 1 (from 5 fused)
- Coccyx: 1 (from 4 fused)

So, the total number of vertebrae considering fusion is:
\[ 7 + 12 + 5 + 1 + 1 = 26 \]

### Step 4: Consider the Total Number of Individual Vertebrae
If we consider the individual vertebrae before fusion, the total would be:
\[ 7 + 12 + 5 + 5 + 4 = 33 \]

### Conclusion
In conclusion, the total number of vertebrae in humans is **26** when considering the fused vertebrae (sacrum and coccyx).

### Final Answer
The total number of vertebrae in man is **26**.

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