ONLY - Pathway of the nerves

Question 1

Describe the olfactory pathway

Answer 1

receptors in olfactory mucosa>cribiform plate>olfactory bulb (synapse) > olfactory tract> forebrain.

Question 2

Describe the optic nerve pathway

Answer 2

retina> optic canal>passes medial to clinoid process > optic chiasma (decussate) > optic tract> thalamus> optic radiation> visual cortec in occipital lobe

Question 3

Describe the vestibular-cochlear pathway

Answer 3

external acoustic canal>cochlear > internal acoustic meatus > anterolateral pons

Question 4

Describe the Hypoglossal nerve pathway

Answer 4

anterolateral lower medulla > hypoglossal canal > inferior side of cranium base, occiput condyles anterior > muscles of the tongue

Question 5

Describe the accessory (spinal) nerve pathway

Answer 5

spinal division = C1-4 > vertebal canal within dural > foramen magnum > merges briefly with cranial division > jugular foramen > sternoid-cleido-mastoid and trapezium muslce

Question 6

Describe the accessory (cranial) nerve pathway

Answer 6

medulla > merges briefly with spinal division> jugular foramen> merges with vagus > pharynx, larynx and palate

Question 7

Describe the trochlear nerve pathway

Answer 7

posterior midbrain> middle cranium fossa> cavernous sinus> superior orbital fissure> superior oblique muscle

Question 8

Describe the abducent nerve pathway

Answer 8

anterior pons> middle cranium fossa> cavernous sinus> superior orbital fissure> lateral rectus muscle

Question 9

Describe the vagus nerve pathway

Answer 9

anterolateral medulla> jugular foramen>supplies throat structures >cartoid sheath > viscera

Question 10

Describe the glossopharyngeal nerve pathway

Answer 10

anterolateral medulla > jugular foramen> parotid gland, stylopharyngeal muscle, posterior 1/3 tongue, middle ear, (parasympathetic), pharynx.

Question 11

Describe the trigeminal nerve pathway opthalmic division

Answer 11

pons>trigeminal ganglion> floor of middle cranial fossa > cavernous sinus > superior orbital fissure > supra-orbial foramen (notch)

Question 12

Describe the trigeminal nerve pathway

maxillary division

Answer 12

pons>trigeminal ganglion> anterior floor of middle cranial fossa > foramen rotundum > inferior orbital fissure > infra-orbial foramen

Question 13

Describe the trigeminal nerve pathway

mandibular division

Answer 13

pons>trigeminal ganglion>foramen ovale> mandibular foramen > mental foramen
motor division passes under the trigeminal ganglion then to foramen ovale.

Question 14

Describe the Facial nerve pathway

Answer 14

Pons > internal auditory meatus > facial canal > stylomastoid foramen (motor branch) muscles of face.

Parasympathetic - submandibular and sublingual glands of face, anterior 2/3 of the tongue, ear (tympanic membrane, stapedius muscle), mastoid and temporal areas

Question 15

Describe the pathway of the Spinal accessory nerve

Answer 15

Arises from C1-4 >passes up inside the vertebral canal > foramen magnum> breifly joins the cranial division passing back out to jugular foramen > down to sternoid cleiod mastoid and trapezium

Question 16

what nerve passes through the mandiubular foramen

Answer 16

CN V 3, mandibular division of the trigeminal nerve