Bs545 Cranial Nerves

Front 1

Where does the Trochlear nerve originate?

Back 1

Dorsal surface of the brain stem.

Front 2

What is the route of the Trochlear nerve after leaving its origin including the exit from the cranium?

Back 2

Curves around the lateral aspect of the cerebral peduncle, and exits the cranium through the orbital fissure.

Front 3

What does the trochlear nerve do?

Back 3

It's a motor nerve that supplies the superior oblique muscle of the eye.

Front 4

What number is given to the Trochlear nerve?

Back 4

IV

Front 5

What are the three branches of the trigeminal nerve?

Back 5

Opthalmic nerve

Maxillary Nerve

Mandibular Divisions

Front 6

What is the number given to the Trigeminal nerve?

Back 6

V

Front 7

Where does the Trigeminal nerve take its sensory roots? Where is its motor root compared to the sensory root?

Back 7

Lateral surface of pons.

Motor root is more ventrally located.

Front 8

Where does the Opthalmic divsion of the Trigeminal nerve leave the skull?

Back 8

Oribital fissure.

Front 9

Is the opthalmic division of the Trigeminal nerve motor or sensory?

What area does it innervate?

Back 9

Sensory.

Skin and mucosa overlying the eyeball, forehead and nose.

Front 10

Where does the Maxillary division of the Trigeminal nerve leave the skull?

Back 10

Round foramen.

Front 11

What is innervated by the Maxillary division of the Trigeminal nerve?

Back 11

Sensory supply to palate, upper teeth, upper lip, and part of the forehead and cheek.

Front 12

Where does the Mandibular division of the Trigeminal nerve leave the skull?

Back 12

Foramen ovale.

Front 13

What is innervated by the Mandibular division of the Trigeminal nerve?

Back 13

Motor components supply mainly the muscles of mastication.

Sensory components supply the skin and mucosa of the tempral region, ear, jaw, cheek, lower teeth, and tongue.

Front 14

What is the number given to the Abducens cranial nerve?

Back 14

VI

Front 15

Where does the Abducens nerve arise?

Back 15

Near the lateral margin of the midbrain, posterior to the pons.

Front 16

Where does the Abducens nerve leave the skull?

Back 16

Orbital fissure

Front 17

What does the Abducens nerve innervate?

Back 17

External rectus and retractor oculi muscles of the eye.

Front 18

What is the number for the Facial and Vestibulocochlear nerves?

Back 18

Facial - VII
Vestibulocochlear - VIII

Front 19

Where does the facial nerve enter and exit the skull?

Back 19

Enters through internal auditory meatus of the skull.

Exits through the facial canal of the petrous bone and emerges at the stylomastoid foramen.

Front 20

Where does the Vestibulocochlear nerve enter the skull?

Back 20

Through the internal auditory meatus.

Front 21

What do the major motor components of the Facial nerves innervate?

The sensory components?

Back 21

Muscles of the head (excluding the muscles of mastication).

Supply the tongue and soft palate.

Front 22

Between what two structures of the medulla does the Facial nerve pass?

Back 22

Trapezoid body and the pons.

Front 23

What is the function of the Vestibulochochlear nerve?

Back 23

It is the auditory nerve and transmits sensation of equilibrium from the inner ear.

Front 24

The vestibulocholear arises in the _______ where the trapezoid body passes beneath the cerebellum.

Back 24

Medulla

Front 25

After entering the internal auditory meastus, the vestibulocochlear nerve divides into the ____ and the ____ divisions.

Back 25

Vestibular and cohclear divisions.

Front 26

What is the function of the vestibular nerve including the three areas involved?

Back 26

It conveys sensations of equilibrium from the semicircular canals, the sacculus, and the utriculus.

Front 27

What is the function of the cochlear nerve?

Back 27

It conveys auditory sensations from the cochlea.

Front 28

What are the cranial nerve numbers assigned to the Glossopharyngeal, Vagus, Accessory, and Hypoglossal nerves?

Back 28

IX, X, XI, XII

Front 29

Where do the Glossopharyngeal, Vagus and Accessory nerves exit the skull?

Back 29

Via the jugular foramen.

Front 30

Where does the Hypoglossal nerve exit the skull?

Back 30

Via the hypoglossal foramen.

Front 31

Where does the Glossopharyngeal nerve originate?

Back 31

In the medulla, on the lateral side posterior to CnVIII.

Front 32

What does the Glossopharyngeal innervate?

Back 32

A sensory branch goes to the tongue and pharyngeal mucosa.

A motor branch supplies the pharyngeal muscles.

Front 33

Where does the Vagus nerve originate?

Back 33

Lateral side of the medulla posterior to CnIX.

Front 34

What does the Vagus nerve innervate?

Back 34

The sensory branches supply the external ear and laryngeal muscosa.

The motor branches supply the muscles of the pharynx and larynx.

Both motor and sensory branches supply the heart, lungs, and abdonminal viscera.

Front 35

The Accessory nerve is formed by numerous rootlets from the ___ and ___.

Back 35

medulla and spinal cord.

Front 36

What does the Accessory nerve innervate?

Back 36

Motor supply to various neck and trapezius muscles.

Front 37

Where does the Hypoglossal nerve arise?

Back 37

From the ventral side of the medulla, all along its length.

Front 38

What primary structure does the Hypoglossal innervate?

Back 38

The tongue.

Front 39

Spare

Back 39

Spare

Front 40

Spare

Back 40

Spare

Front 41

For each colored area, fill in the appropriate cranial nerve number for areas on the left side. Don't worry about the abbreviations on the right side.

Back 41

See the picture.

Front 42

Label all colored areas except green.

Back 42

See the labeled picture.