Lecture 21 Flashcards
(25 cards)
State the 4 pairs of cranial nerves that carry parasympathetic information
Facial (VII)
Glossopharyngeal (IX)
Oculomotor (III)
Vagus (X)
“(FGOV = Federal GOVernment)”
The oculomotor nerve carries which 2 modalities?
GSM (general somatic motor) and GVM (general visceral motor)
Which 4 extrinsic eye muscles does the oculomotor nerve innervate? name the other muscle associated with they eye that it innervates
Superior rectus
Inferior rectus
Medial rectus
Inferior oblique
“(SIMI mnemonic)”
Levator palpebrae superioris
What nerve begins at the Edinger-Westphal nucleus?
Oculomotor nerve
State the 2 muscles that are supplied by the postganglionics of the oculomotor nerve
Constrictor pupillae (control the shape of the pupil)
Ciliary muscles (control the shape of the lens)
What nerve innervates the superior oblique muscle of the eye?
the Trochlear nerve
State the 3 branches of the Trigeminal nerve
Ophthalmic (V1)
Maxillary (V2)
Mandibular (V3)
“(OMM mnemonic)”
What branch of the trigeminal nerve supplies sensation to the nose and skin above eye/upper eyelid?
Ophthalmic branch of the Trigeminal nerve
(does NOT supply sensation to the lower eyelid
Explain the controversy surrounding whether or not the trigeminal nerve is a parasympathetic nerve or not.
Since the Trigeminal nerve and some branches of the facial nerve run together, the trigeminal nerve is sometimes mistakenly called a parasympathetic nerve
Which is the largest of the 12 CNs? Describe the sensory and motor functions of the this CN.
Trigeminal nerve
Supplies the sensory innervation to the face and tongue (NOT motor or taste innervation, just sensory)
Supplies the motor innervation to the muscles of mastication
What are the 2 nerves that supply the taste sensation of the tongue? Which of these 2 provides the motor innervation of the tongue?
Posterior 3rd: Glossopharyngeal Nerve
Anterior 2/3rds: Facial Nerve
The Glossopharyngeal Nerve provides innervation for the motor functions of the tongue
State the 2 CNs that provide the sensory innervation of the eardrum. Which of these also provides sensory sensation to the oral/nasal cavities?
Internal surface of Eardrum: Glossopharyngeal Nerve
External surface of the Eardrum: Trigeminal Nerve (some help from Facial Nerve)
The Trigeminal Nerve provides the sensory innervation of the oral/nasal cavities
State the 2 nerves that provide the innervation of the digastric muscle and be sure to state which belly of the muscle they innervate.
Anterior belly of Digastric M.: Trigeminal nerve (both the anterior belly and CN V come from pharyngeal arch 1)
Posterior belly of Digastric M.: Facial nerve (both the posterior belly and CN VII come from pharyngeal arch 2)
The Facial nerve carries ____ fibers as part of the Parasympathetic system.
GVM (general visceral motor)
State the 5 motor branches of the Facial CN that supply the mimetic muscles
Temporal (NOT Temporalis)
Zygomatic
Buccal
Mandibular
Cervical
“(The Zoo Brings Many Children)”
In terms of the SVS functions of the Facial nerve, state where the following are found
Cell bodies of primary sensory neurons:
Secondary neurons origin:
Tertiary neurons End:
Cell bodies of primary sensory neurons: Geniculate Ganglion
Secondary neurons origin: Solitary Nucleus
Tertiary neurons End: Thalamus
True or False:
There is a neural pathway between the Solitary nucleus and the Inferior Salivatory nucleus. explain.
False
There is a neural pathway between the Solitary nucleus and the SUPERIOR Salivatory nucleus
NOT a neural pathway between the Solitary nucleus and the Inferior Salivatory nucleus
State where the GVM cell bodies of the preganglionic and postganglionic neurons of the Facial nerve can be found.
GVM Preganglionic neurons of Facial nerve: Superior Salivary nucleus and Lacrimal nucleus
GVM Postganglionic neurons of Facial nerve: Submandibular (sublingual) and pterygopalatine ganglia
In terms of the path of the chorda tympani , state the nerve it branches from in the petrous portion of the temporal bone
Then state the nerve it joins after running along the eardrum.
nerve it branches from in the petrous portion of the temporal bone = Facial nerve
nerve it joins after running along the eardrum = Trigeminal nerve
The cell bodies of the motor neurons of what CN are found in the nucleus ambiguous? what muscle do these supply?
cell bodies of the motor neurons of: Glossopharyngeal Nerve
Stylopharyngeus muscle
Describe the path of the GVM neurons that supply the parotid gland. Which CN is responsible for this?
Preganglionic neurons:
Postganglionic neurons:
Preganglionic neurons: Inferior Salivatory nucleus
Postganglionic neurons: Otic Ganglion
These are all a branch from the Glossopharyngeal nerve
Which CN carries sensation from the carotid body and carotid sinus?
Glossopharyngeal nerve
What CN has the following sensory functions?
Posterior 3rd of the tongue
External Ear
Middle Ear Cavity
Glossopharyngeal nerve
Which CN is the major parasympathetic nerve to the thoracic and abdominal organs? Describe the motor role this CN plays.
Vagus Nerve
provides motor innervation to muscles of the 4th and 5th pharyngeal arches (the pharynx and larynx muscles that are used to swallow/speak)
