Question
Which nerve is targeted by the local anesthesia technique indicated in the image?
| A. |
Nasociliary nerve
|
| B. |
Anterior ethmoidal nerve
|
| C. |
Sphenopalatine nerve
|
| D. |
Greater palatine nerve
|
Show Answer
|
Correct Answer » B
Explanation
|
|
The image demonstrates injection at:
- The superomedial orbital region
- Near the medial canthus/root of the nose
This corresponds to a block of the:
Anterior ethmoidal nerve
The anterior ethmoidal nerve is a branch of:
- Nasociliary nerve
- Which itself arises from the ophthalmic division (V1) of the trigeminal nerve.
B. Anterior ethmoidal nerve
The anterior ethmoidal nerve supplies:
- Anterior nasal cavity
- Nasal septum
- Lateral nasal wall
- External nasal skin
Clinical use of the block:
- Nasal surgeries
- Septoplasty
- Rhinoplasty
- Nasal fracture reduction
The injection site shown in the image matches the anterior ethmoidal nerve block approach.
Why Other Options Are Incorrect
A. Nasociliary nerve
- The anterior ethmoidal nerve is a branch of the nasociliary nerve.
- The block shown is more distal and specifically targets the anterior ethmoidal nerve.
C. Sphenopalatine nerve
- Sphenopalatine ganglion block is performed transnasally/posteriorly.
- Not through the superomedial orbital region.
D. Greater palatine nerve
- Greater palatine nerve block is administered through the greater palatine foramen in the palate.
- Used for palatal anesthesia.
