Question:easy
Murphy's eye is seen in:
Murphy's eye is seen in:
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A side-wall vent hole near the tip of a breathing tube.
Updated On: Jun 23, 2026
- Macintosh laryngoscope
- Endotracheal tube
- LMA
- Flexible laryngoscope
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The Correct Option is B
Solution and Explanation
Step 1: Identify the device by the eponym. Murphy described a safety vent built into the breathing tube used for intubation.
Step 2: This vent is a side perforation just proximal to the bevelled tip of an endotracheal tube, and tubes carrying it are called Murphy-type tubes (those without it are Magill-type).
Step 3: Function: should the primary distal lumen of the $ETT$ be blocked, ventilation continues through the Murphy eye, preventing total airway obstruction.
Step 4: The laryngoscopes and LMA listed are not tubes and carry no such vent, so the structure belongs to the endotracheal tube.\[\boxed{\text{Endotracheal tube}}\]
Step 2: This vent is a side perforation just proximal to the bevelled tip of an endotracheal tube, and tubes carrying it are called Murphy-type tubes (those without it are Magill-type).
Step 3: Function: should the primary distal lumen of the $ETT$ be blocked, ventilation continues through the Murphy eye, preventing total airway obstruction.
Step 4: The laryngoscopes and LMA listed are not tubes and carry no such vent, so the structure belongs to the endotracheal tube.\[\boxed{\text{Endotracheal tube}}\]
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