CN and Brainstem Flashcards
CN I
Olfactory
CN II
Optic
CN III
Oculomotor
CN IV
Trochlear
CN V
Trigeminal
CN VI
Abducens
CN VII
Facial
CN VIII
Vestibulocochlear
CN IX
Glossopharyngeal
CN X
Vagus
CN XI
Accessory
CN XII
Hypoglossal
CN that are extension of Telencephalon
Olfactory
Optic
CN that exit from midbrain
Oculomotor
Trochlear
CN that exit from pons
Trigeminal
Abducens
Facial
Vestibulocochlear
CN that exit from medulla
Glossopharyngeal
Vagus
Accessory
Hypoglossal
Receives information about deep/crude touch, pain and temperature from the ipsilateral face
Spinal Trigeminal Nucleus
CNs that convey pain information from their areas to the spinal trigeminal nucleus
CNs VII, IX and X
Receives information about discriminative sensation and light touch of the face as well as conscious propioception of the jaw via first order neurons
Principal Sensory Nucleus
Involved with propioception of the face, that is, the feeling of position of the muscles
Mesencephalic Nucleus
Contains no chemical synapses but are electrically coupled —> neurons of this nucleus are pseudounipolar cells receiving propioceptive information from the mandible, and sending projections to the motor trigeminal nucleus to mediate monosynaptic jaw jerk reflexes
Mesencephalic Nucleus
The only structure in the CNS to contain the cell bodies of a primary afferent, which are usually contained within ganglia
Mesencephalic Nucleus
Contains motor neurons that innervate muscles of the first branchial arch, namely the muscles of mastication, the tensor tympani, tensor veli palatini, mylohyoid, and anterior belly of the digastric
Trigeminal Motor Nucleus
Muscles of mastication
–masseter
–temporalis
–medial pterygoid
–lateral pterygoid
•Others –Tensor veli palatini –mylohyoid –anterior belly of digastric –tensor tympani
Controls the muscles of facial expression
Facial nerve
Conveys taste sensations from the anterior two-thirds of the tongue and oral cavity
Facial nerve
Supplies preganglionic parasympathetic fibers to several head and neck ganglia
Facial nerve
Provides parasympathetic innervation to several glands, including the nasal, palatine, lacrimal and pharyngeal glands
Greater petrosal nerve
Provides motor innervation for stapediusmuscle in middle ear
Nerve to stapedius
Controls movements of some of the scalp muscles around the ear
Posterior auricular nerve
Five major facial branches (in parotid gland)
temporal, zygomatic, buccal, marginal mandibular, cervical
Aids in tasting, swallowing and salivary secretions. Its superior and inferior (petrous) ganglia contain the cell bodies of pain fibers
Glossopharyngeal Nerve
CN IX
Taste from the posterior one-third of the tongue and information from carotid baroreceptors and carotid body chemoreceptors
Solitary nucleus
CN IX
Lower motor neurons for the stylopharyngeus muscle
Nucleus ambiguus
CN IX
Somatic sensory fibers from the middle ear
Spinal nucleus of trigeminal nerve
CN IX
Parasympathetic input to the parotid and mucus glands
Inferior salivatory nucleus
Sends parasympathetic output to the viscera, especially the intestines
Dorsal nucleus of vagus
CN X
Gives rise to the branchial efferent motor fibers of the vagus nerve and preganglionic parasympathetic neurons that innervate the heart
Nucleus ambiguus
CN X
Receives afferent taste information and primary afferents from visceral organs
Solitary nucleus
CN X
Receives information about deep/crude touch, pain, and temperature of the outer ear, the duraof the posterior cranial fossa and the mucosa of the larynx
Spinal trigeminal nucleus
Provides motor innervation from the CNS to two muscles of the neck
Accessory Nerve
sternocleidomastoid and the trapezius muscles
Muscle that ilts and rotates the head
Sternocleidomastoid muscle
Elevates shoulder and adducts the scapula
Trapezius
Supplies motor fibres to all of the muscles of the tongue, except the palatoglossus muscle
Hypoglossal Nerve
