Branchiomeric Cranial Nerves (Quiz 2) Flashcards
What is the largest CN?
trigeminal n.
What are the 2 axonal categories for the trigeminal n.?
somatic sensory and pharyngeal motor
it is primarily responsible for transmitting tactile, proprioceptive, temp., and pain from the head
The input from CN V projects to the _______________, cerebellum, and reticular formation
cerebral cortex
What are the 3 divisions for the trigeminal n.?
-ophthalmic (V1) sensory
-maxillary (V2) sensory
-mandibular (V3) sensory and motor
The 3 divisions of the trigeminal nerve converge in a large ganglion in the mid pons. What is this ganglion called?
trigeminal ganglion/semilunar/ Gasserian ganglion
The 3 sensory nuclei of the trigmeinal nerve receive afferents from a long continuous column from the rostral midbrain to the upper spinal cord. What are they 3 nuclei called?
1) sensory nucleus (also called main sensory nucleus bc its the main nucleus)
2) spinal nucleus (just caudal to the sensory nucleus)
3) mesencephalic nucleus (rostral to midbrain)
Each component of CN V is responsible for sensory info from a different region of the face. The ophthalmic branch or CN V1 receives input from the….
-upper eyelids
-supraorbital area
-over frontal b.
-dura mater of anterior cranial fossa
-frontal sinus
-nasal cavity
What are the main nerves from CN V1?
-nasociliary n.
-frontal n.
-lacrimal n.
What does CN V2 innervate?
-maxila
-middle face
-upper teeth
-hard palate
What are the main nerve branches for CN V2?
boards q
-middle meningeal n.
-zygomatic n.
-pterygopalatine n.
palatine n.
-superior alveolar n.
-infraorbital n.
What is the largest division of the trigeminal n.?
CN V3 (mandibular division)
Which division of the trigeminal nerve is both sensory and motor?
CN V3 (mandibular division)
What does CN V3 innervate?
-lower jaw
-bottom teeth
-oral cavity
-gingiva
The motor component of CN V3 is a single, slender nerve with 1 nucleus. What is the nucleus called?
trigeminal motor nucleus
The motor component of CN V3 leaves the motor nucleus at superior pontine sulcus, innervates muscle of 1st pharyngeal arch. What muscles are here?
-muscles of mastication (pterygoid, masseter, and temporalis)
-mylohyoid
-anterior digastric
-tensor tympani
T/F: the trigeminal nerve has 4 nuclei- 3 sensory and 1 motor
true
Which trigeminal nucleus processes proprioception from the jaw and has mechanoreceptors from teeth?
mesencephalic nucleus
Unconscious control of biting, chewing, and swallowing due to sensory feedback from _____________ nucleus of the trigeminal n.
mesencephalic
What is the jaw jerk reflex/ biting reflex?
Which nucleus of the trigeminal n. has tactile and proprioceptive sensation and 2 ascending pathways:
1) anterior trigeminothalamic tract (fibers cross and synapse in VPM)
2) posterior trigeminothalamic tract (uncrossed fibers to VPM (oral cavity))?
principle nucleus/ main nucleus/ sensory nucleus of trigeminal
What is the only shared nucleus for CNs 5, 7, 9 and 10?
spinal trigeminal nucleus
The spinal trigeminal nucleus is a long nucleus. What does the caudal portion process?
pain and temp (free nerve endings bring in this info with C fibers and A delta fibers, A delta is faster than C fibers)
The 2nd order neurons from the caudal portion of the spinal trigeminal nucleus form a crossed pain pathway posterior ______________________
trigeminothalamic tract (homologous to lamina 2 substantia gelatinosa and spinothalamic tract)
Which trigeminal nucleus innervates the muscles of mastication?
trigeminal motor nucleus