Cranial Nerves Flashcards
What nervous system are the CN and their ganglia associated with?
Peripheral Nervous System (PNS)
Where do all CN originate (EXCEPT CN 11)?
Cranial Cavity
What CN carry only sensory fibers?
CN 1, 2, and 8
What CN carry only motor fibers?
CN 3, 4, 6, 11, and 12
What CN carry mixed (motor and sensory) fibers?
CN 5, 7, 9, and 10
Where do CN derive from?
Brain or Brainstem
(T/F) Cranial Nerves are formed by the fusion of dorsal and ventral roots.
False
(T/F) Cranial Nerves do not divide into dorsal and ventral primary rami.
True
(T/F) CN 1 and 2 are not associated with sensory ganglia.
True
What is the function of GSA fibers?
Sensation from somatic structures like skin and skeletal muscle, sensation from mucosal and nasal cavities, pharynx, esophagus, etc.
What is the function of GVA fibers?
Senation from visceral structures of the head like the carotid body and carotid sinus, thoracic, and abdominal viscera.
(T/F) Special sensory is not unique to cranial nerves?
False
What is the function of special sensory fibers (SA)?
sensations from specialized receptors related to special senses like vision, hearing, equilibrium, test, smell.
What CN are SA fibers located?
CN 1, 2, 7, 8, 9, and 10
What is the function of GSE fibers?
Motor innervation to skeletal muscle
Where are GSE fibers derived in the embryo?
Somite Mesoderm
What is the function of GVE fibers?
Parasympathetic motor innervation to smooth muscle and glands
What CN are the GVE fibers located?
CN 3, 7, 9, and 10
What is the function of BE fibers?
Motor to skeletal muscle in the head
Where are BE fibers derived in the embryo?
Branchial Mesoderm (pharyngeal arch)
Of the 6 pharyngeal arches, which one is rudimentary with no function?
5th Arch
What CN is within the 1st arch?
CN 5 V3; Mandibular portion of the Trigeminal Nerve
What CN is within the 2nd arch?
CN 7 (Facial Nerve)
What CN is within the 3rd arch?
CN 9 (Glossopharyngeal)
What CN is within the 4th and 6th arches?
CN 10 (Vagus)
GSA sensory neurons are _______ (cell type), and where are they located?
Pseudopolar; peripheral sensory ganglia
GSE/BE motor neurons are ________ (cell type), and are located where?
Multipolar; brain motor nuclei
What spinal cord segments do preganglionic sympathetic (GVA and GVE) fibers come from?
T1-T2
Superior and Inferior Sensory Ganglia of CN 9 and 10 contain what what cell bodies?
GVA Sensory Cell Bodies
Preganglionic spinal cord gray matter at T1-T2 contain what cell bodies?
GVE Motor Cell Bodies
Where are the postganglionic sympathetic GVE Motor Cell bodies?
Superior Cervical Chain Ganglia
What fibers are found in the brainstem motor nuclei of CN 3, 7, 9, and 10?
GVE Parasympathetic Preganglionic fibers
Where are GVE motor cell bodies of postganglionic parasympathetic nerves found?
Terminal motor ganglia of the head
Associate the following cranial nerves with their respective terminal motor ganglia:
- CN 3 a. Otic Ganglion
- CN 7 b. Ciliary Ganglion
- CN 9 c. Intrinsic Ganglia of the Viscera of the
- CN 10 thorax, foregut, and midgut
d. Submandibular ganglion,
Pterygopalatine ganglion
- b
- d
- a
- c
