Cranial Nerves: Order, Functions, and Features

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What is the order of the cranial nerves?

1. Optic 2. Olfactory 3. Occulomotor 4. Trochlear

1. Trigeminal 2. Abducens 3. Facial 4. Vestibulocochlear

1. Olfactory 2. Optic 3. Occulomotor 4. Trochlear (correct)

1. Occulomotor 2. Trochlear 3. Trigeminal 4. Abducens

Which of the following is NOT a characteristic of the olfactory nerve?

It has a sensory component only

It is unmyelinated

It is the shortest cranial nerve

It has a motor component (correct)

What is the function of the olfactory nerve?

Sense of smell (correct)

Movement of the eye

Transmission of sensory information from the retina to the primary visual cortex

Transmission of sensory information from the ear to the primary auditory cortex

What is NOT a cause of damage to the olfactory nerve?

Vitamin deficiency Signup and view all the answers

How is the visual acuity of the optic nerve tested?

By asking the patient to read from a printed page Signup and view all the answers

What is the function of the optic nerve?

Transmission of sensory information from the retina to the primary visual cortex Signup and view all the answers

What is the primary function of the oculomotor nerve in regards to the pupillary reflex?

To control the contraction of the pupil Signup and view all the answers

What type of blindness is associated with a lesion in the optic nerve?

Monocular blindness Signup and view all the answers

What is the purpose of the consensual reflex in pupillary examination?

To observe the contralateral eye's response to light Signup and view all the answers

What is the function of the trochlear nerve?

To supply the superior oblique muscle Signup and view all the answers

What is the result of a left optic nerve lesion in regards to the pupillary reflex?

Left direct reflex is lost, left consensual reflex is maintained Signup and view all the answers

What is the formula used to remember the innervations of the trochlear and abducens nerves?

SO4LR6 Signup and view all the answers

What is the consequence of a III nerve palsy?

Eye is fixed down and out Signup and view all the answers

What is the component of function of the trigeminal nerve?

Motor and sensory Signup and view all the answers

What is the purpose of the letter H test in examining cranial nerves?

To test the extra-ocular muscles Signup and view all the answers

What is the division of the sensory component of the trigeminal nerve?

Ophthalmic, maxillary, and mandibular Signup and view all the answers

Which cranial nerve is responsible for the motor function of the muscles of mastication?

V nerve Signup and view all the answers

What is the effect of a UMN lesion on the facial nerve (VII)?

Half the face is affected, excluding the forehead Signup and view all the answers

What is the function of the chorda tympani?

Sensory function for taste in the anterior 2/3rds of the tongue Signup and view all the answers

What is the difference between LMN and UMN lesions in terms of the areas affected?

LMN affects the forehead and face, while UMN affects only the face Signup and view all the answers

What is the function of the vestibulocochlear nerve (VIII)?

Sensory function for hearing and balance Signup and view all the answers

What is the principle role of the glossopharyngeal nerve (IX)?

Sensory function for the pharynx and tonsillar fossa Signup and view all the answers

What is the effect of a lesion of the vagus nerve (X)?

Pharynx, larynx, and soft palate are affected Signup and view all the answers

Cranial Nerves: Order, Functions, and Features

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