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I Am A USMLE Freak

Wants to meet Doctors : I Want To Meet Other Doctors Preparing For USMLE

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Isa

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

Neurology: What Are Schwann Cells
~0.5 mins read
Schwann cells are structures that surround the Axons (See my last post for a short explanation of what Axons are) in the Peripheral Nervous System.
This is the structure that surrounds and provides Myelin to wrap and insulate axons

Schwann cells are derived from the Neural Crest cells

Functions of the Schwann cell
1. Promote regeneration of the axon after injury.
2. One Schwann cell myelinates (surrounds and provides myelin) for one Peripheral Nevous System (PNS) Axon.

Which disease condition can result from injury to the Schwann cells
1. Guillain-Barré syndrome.

See my next post to know what Guillain Barre syndrome is all about
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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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