Cranial Nerve Lecture Flashcards
What do the somatic motor axons of CN III innervate?
Superior, Inferior, and Medial Rectus
Inferior Oblique
Levator Palpebrae Superioris
What somatic motor function does CN IV innervate?
Superior Oblique muscle
What somatic motor function does CN VI innervate?
Lateral Rectus muscle
What innervates all of the intrinsic and extrinsic muscles of the tongue?
CN XII
What provides all somatic sensory innervation to the face?
CN V
What three cranial nerves provide somatic sensory innervation to the outer ear?
CN VII, IX and X
Why can patients with Bell’s Palsy complain of ear aches?
Disruption of precise sensory innervation of outer ear by the facial nerve
Where do pre-ganglionic and post-ganglionic neurons synapse for sympathetic innervation to the head?
Superior Cervical ganglion
*Sympathetic innervation arises from T1, T2 spinal nerves
Describe parasympathetic innervation of CN III.
Ciliary ganglion
Innervates pupillary sphincter muscle, ciliary muscle
Describe parasympathetic innervation of CN VII.
Pterygopalatine ganglion - innervates lacrimal gland, mucus glands of nose palates
Submandibular ganglion - innervates submandibular and sublingual salivary glands
Describe parasympathetic innervation of CN IX.
Otic ganglion
Innervates parotid gland
Describe parasympathetic innervation of CN X.
Many ganglia in thorax, abdomen
Provides parasympathetic innervation to many organs in thorax and abdomen
What nerves provide parasympathetic motor innervation to the head?
III
VII
IX
X
What provides parasympathetic sensation innervation to the nasopharynx?
CN VII
What parasympathetic sensation does CN IX provide?
Posterior third of tongue
Oropharynx
Tympanic cavity and auditory tube
Carotid sinus
What parasympathetic sensation does CN X provide?
Laryngopharynx, larynx in head
Many organs in thorax and abdomen
What taste sensation does CN VII provide?
Anterior two thirds of tongue
What taste sensation does CN IX provide?
Posterior third of tongue
What taste sensation does CN X provide?
Posterior tongue, immediately anterior to the epiglottis
What branchiomotor innervation arises from CN V (All from V3)?
Mastication muscles
Mylohyoid
Tensor tympani
Tensor palati
Anterior belly of digastric
What branchiomotor innervation arises from CN VII?
Facial Expression muscles
Stylohyoid
Posterior belly of digastric
Stapedius
What branchiomotor innervation arises from CN IX?
Stylopharyngeus
What branchiomotor innervation arises from CN X?
All muscles of pharynx (except stylopharyngeus)
Muscles of larynx
All muscles of palate (except tensor palati)
What branchiomotor innervation arises from CN XI?
Sternocleidomastoid
Trapezius
