Cranial Nerves

Question 1

Pathway of oculomotor nerve

Answer 1

enters orbit via superior orbital fissure

Question 2

What kind of fibers do we find with the oculomotor nerve?

Answer 2

general somatic efferent fibers

and parasympathetic fibers.

Question 3

Parasympathetic pathway of Oculomotor Nerve!

Answer 3

preganglionic parasympathetic GVE fibers that synapse onto ciliary ganglion that run in short ciliary nerves to supply the sphincter pupilae and ciliary muscle (accommodation)

Question 4

Describe the products of parasympathetic innervation of oculomotor nerve?

Answer 4

Pupilary constrictor
Produces aqueous humor
Focuses the lens.

Question 5

Pathway of the Trochlear Nerve

Answer 5

Emerges from the brainstem, goes through superior orbital fissure enters the orbit and then goes to Superior Oblique Muscle.

Question 6

Type of fibers of the trochlear nerve

Answer 6

general somatic efferent

Question 7

What fibers do we find with the trigeminal nerve

Answer 7

general somatic afferent

special visceral efferents

Question 8

Abducens nerve function

Answer 8

innervation to the Lateral Rectus, muscle in the eye

Question 9

Pathway of the abducens muscle

Answer 9

Dura,–> Dorsum sell of the sphenoid bone—>cavernous sinus—>supraorbital fissure —>orbit

Question 10

fibers of abducens nerve

Answer 10

General Somatic Efferents

Question 11

fibers of trigmeninal

Answer 11

special visceral efferent

general somatic afferent

Question 12

The trigeminal nerve supplies special visceral efferent fibers to

Answer 12

muscles of mastication
mylohyoid
anterior belly of digastric
tensor tymphani
tensor veli palatini

Question 13

where is the trigminal ganglion found?

Answer 13

Meckel’s cave, the petrous portion of the temporal bone.

Question 14

Pathway of trigeminal nerve of V1

Answer 14

Runs in the dura of the lateral wall of the cavernous sinus and enters the orbit through the supraorbital fissure.

Question 15

Lacrimal nerve

Answer 15

innervation to lacrimal gland, conjunctiva, skin of the upper lid

Question 16

Frontal nerve

Answer 16

divides into the supraorbital and supratrochlear nerve and supplies the scalp, forehead, frontal sinus, and upper lid.

Question 17

nasociliary nerve

Answer 17

gives rise to the communicating branch to the ciliary ganglion

short ciliary nerves which carry postganglionic parasympathetic and sympathetic and afferent fibers
long ciliary nerves, postganglionic sympathetic fibers to dilator pupillae, and afferent fibers from the iris and cornea

both the anterior ethmoid supplies the sphenoidal and posterior ethmoidal sinuses and posterior ethmoid nerves -> supplies the sphenoidal and posterior ethmoidal sinuses

infratrochlear nerve,

Question 18

Meningeal branch

Answer 18

supplies dura in the anterior cranial fossa!

Question 19

Pathway of Maxillary Division

Answer 19

passes through the lateral wall of the cavernous sinus and through the foramen rotundum.

Question 20

function of maxillary division

Answer 20

General somatic afferents to below the eyes but above the upper lip.

Mediates the afferent limb of the sneeze reflex.

Question 21

Meningeal Branch of maxillary division

Answer 21

innervates the dura mater of the medial cranial fossa

Question 22

Ptergopalatine nerve

Answer 22

connects to the pterygopalatine ganglion

Question 23

Posterior-superior alveolar nerve

Answer 23

innervates the cheeks, gums, molar teeth, and maxillary sinus

Question 24

Zygomatic nerve

Answer 24

divides into zygomaticofacial and zygomaticotemporal nerves

Question 25

infraorbital

Answer 25

gives rise to the middle and anterior-superior alveolar nerves that supplies maxillary sinus teeth, and gums.

Question 26

What mediates the afferent limb of the corneal reflex

Answer 26

nasociliary branch of the trigeminal nerve (V1).

Question 27

What mediates the afferent limb of the negate branch, | posterior superior lateral nasal branchessneeze reflex?

Answer 27

maxillary division of trigeminal

Question 28

what innervates the efferent limb of the sneeze reflex

Answer 28

Vagus nerve

Question 29

Branches via the pterygopalatine ganglion

Answer 29

``` orbital branches pharyngeal branch posterior- superior lateral nasal branches greater palatine nerve lesser palatine nerve nasopalatine nerve ```

Question 30

Pathway of the mandibular division of the trigeminal

Answer 30

passes through foramen ovale

Question 31

Fibers of mandibular division of trigeminal

Answer 31

special visceral efferent

Question 32

What does mandibular division of trigeminal nerve innervate

Answer 32

``` tensor veli palatini tensor tymphani muscles of mastication anterior belly of digastric mylohyoid muscles ```

Question 33

What mediates the afferent and efferent limbs of the jaw jerk reflex?

Answer 33

mandibular division of the trigeminal nerve

Question 34

Meningeal branch of V3

Answer 34

supplies the dura in the middle cranial fossa

Question 35

muscular branches of V3

Answer 35

masseter, deep temporal, medial pterygoid and lateral ptygoid nerve

Question 36

Buccal nerve

Answer 36

innervates skin on the buccinator and mucous membrane of the cheek and gums

Question 37

Lingual nerve

Answer 37

supplies general sensation to the anterior 2/3rd of the tongue, joins chorda tympani, which contains preganglionic parasympathetic and taste fibers and supplies the anterior 2/3rd of the tongue for taste sensation and submandibular and sublingual glands for salivary secretion

Question 38

inferior alveolar nerve

Answer 38

gives rise to mylohyoid nerve, innervating mylohyoid and anterior belly of the digastric, inferior dental branch, lower teeth mental nerve, which innervates the skin over the chin, incisive branch, which innervates the canine and incisor teeth.