Full Cranial Nerves Examination Video-USMLE Step 2 CS

Full Cranial Nerves Examination Video:

Cranial nerves are nerves that emerge directly from the brain and the brainstem, in contrast to spinal nerves (which emerge from various segments of the spinal cord). Information is exchanged between the brain and various regions, primarily of the head and neck, via the cranial nerves.

You should do a full cranial nerve examination in the following USMLE step 2 CS cases:


This video tutorial on Cranial Nerves Examination has been provided by: brainline

Nerve name Nerve no. Function Type
Olfactory

1

Smell Sensory
Optic

2

Vision, sight Sensory
Oculomotor

3

Eye movement, Pupillary constriction, accommodation, eyelid opening Motor
Trochlear

4

Eye movement (superior oblique muscle) Motor
Trigeminal

5

Mastication, Facial sensation, Corneal reflex Sensory and Motor
Abducens

6

Eye movement (lateral rectus) Motor
Facial

7

Facial movement, taste from anterior 2/3 of tongue, lacrimation, salivation, eyelid closing, stapedius muscle in ear Sensory and Motor
Vestibulocochlear

8

Hearing, balance Sensory
Glossopharyngeal

9

Taste from posterior 1/3 of tongue, swallowing, salivation (parotid gland), monitoring carotid body and sinus chemo- and baroreceptors Sensory and Motor
Vegus

10

Taste from epiglottic region, swallowing, palate elevation, midline uvula, talking, coughing, thoracoabdominal viscera, monitoring aortic arch chemo- and baroreceptors Sensory and Motor
Accessory

11

Head turning, shoulder shrugging (SCM, trapezius) Motor
Hypoglossal

12

Tongue movement Motor
References for Cranial Nerves Examination:
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