Isa

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Isa

Picture source: USMLE first aid. Please buy a copy to get more info on this Mnemonic

Anatomy Mnemonics To Know Which Nerves Are Sensory, Motor Or Both Sensory And Motor
~1.0 mins read
The 12 Cranial nerves and their Types
I - Optic (Some)
II - Olfactory (Say) 
III - Oculomotor (Marry) 
IV - Trochlear (Money)
V - Trigeminal (But)
VI - Abducens (My)
VII - Facial (Brother)
VIII - Acoustic or Vestibulocochlear (Says) 
IX - Glossophrayngeal (Big) 
X - Vagus (Bras)
XI - Spinal accessory (Matter)
XII - Hypoglossal (More)

Mnemonic
Some Say Marry Money, But My Brother Says Big Bras Matter More (what cranial nerve is Motor, Sensory, or Both)

Note: Take note of the letters in Bold
1. S = Denotes a Sensory nerve
A sensory nerve doesnt control any movement, however it aids in functioning of some of the sense organs

2. M = Denotes a Motor nerve
A motor nerve controls movement of a muscle, but doesnt supply nerve endings to any sense organ.

3. B = Denotes when a nerve has Both Sensory and Motor properties.
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Isa

Picture source: USMLE first aid. Please buy a copy to get more info on this Mnemonic

Anatomy Mnemonics For Innervation Of Extraocularmotor Muscles (Ophthalmology))
~1.0 mins read
The nerves that supply the extraocularmotor muscles are
1. Abducens nerve or Cranial nerve VI (6)
2. Trochlear nerve or Cranial nerve IV (4)
3. Oculomotor nerve or Cranial nerve III (3)

Mnemonics for the Innervation of Extraocularmotor Muscles
• LR6 (SO4) R3

Explanation of Mnemonics
LR6 = Lateral Rectus muscle --> Innervated by CN6 (VI) Abducens
SO4 = Superior Oblique  muscle --> Innervated by CN4 (IV) Trochlear
R3 = The Rest of the 4 eyeball movers --> Innervated by CN3 (III)  

The muscles innervated by CN 3 (III) Oculomotor nerve are
1. Superior Rectus
2. Inferior Rectus
3. Medial Rectus
4. Inferior Oblique

The Oblique muscles take the eyeballs in the opposite direction. For example the Left Oblique is tested with the patient looking Right and .

Mnemonic
Obliques go Opposite (Left SO and IO tested with patient looking right).

I O U: IO tested looking Up.

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