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Cranial Nerves

QuestionAnswer
What are general afferent fibers? Fibers which originate from the dorsal root ganglion
What are the two main types of general afferent fibers? GSA and GVA
Generally, GSA includes which type of fibers? Pain, temperature, touch, and proprioception
Generally, GVA includes which type of fibers? Sensory impulses from the viscera
What are the two main types of general efferent fibers? GSE and GVE
Generally, GSE includes which type of fibers? Motor fibers that innervate the striate muscles derived from the myotomes of somites
Generally, GVE includes which type of fibers? Fibers which innervate smooth muscles, cardiac muscles, and glands
What type of fibers does the Vagus nerve contain? GSA, GVA, SVA, GVE, and SVE
Where do the fibers of the Vagus nerve originate from according to type? GSA --> Superior sensory ganglion GVA, SVA --> Inferior Sensory ganglion GVE --> Dorsal Motor Nucleus SVE --> Nucleus Ambiguus
What other nuclei do the fibers of the Vagus nerve run through? GSA --> Spinal Trigeminal Nucleus GVA --> Caudal part of the Solitary Nucleus SVA --> Rostral part of the Solitary Nucleus
What is the function of the GSA fibers of the Vagus nerve? Receive exteroception from the external ear
What is the function of the GVA fibers of the Vagus nerve? Receive sensation from the pharynx, larynx, thoracic, and abdominal viscera
What is the function of the SVA fibers of the Vagus nerve? Special sensation from the epiglottis
What is the function of the GVE fibers of the Vagus nerve? Motor innervation of cardiac muscle, smooth muscle, and glands of the thorax and abdomen
What is the function of the SVE fibers of the Vagus nerve? Supplies the muscles of the pharynx, larynx, and palate
What are the effects of Infranuclear Vagal Paralysis? Paralysis of the Soft palate: nasal speech, regurgitation of fluids, and deviation of the uvula to the normal side Paralysis of the larynx: Hoarseness of speech and paralysis of the vocal cord Paralysis of the parasympathetic part: cardiac irregularity
What types of fibers does the Glossopharyngeal nerve contain? GSA, GVA, SVA, GVE, and SVE
Where do the fibers of the Glossopharyngeal nerve originate from according to type? GSA --> Superior sensory ganglion GVA, SVA --> Inferior Sensory ganglion GVE --> Inferior Solitary Nucleus SVE --> Nucleus Ambiguus
What other nuclei do the fibers of the Glossopharyngeal nerve run through? GSA --> Spinal Trigeminal Nucleus and pars caudalis SVA --> Solitary nucleus
What is the function of the GSA fibers of the Glossopharyngeal nerve? Exteroception from the retroauricular region
What is the function of the GVA fibers of the Glossopharyngeal nerve? Pain, temperature, touch from posterior 1/3rd of tongue including upper pharynx, Eustachian tube, and middle ear/ carotid sinus and body / gag reflex
What is the function of the SVA fibers of the Glossopharyngeal nerve? Sensation from the valate papillae
What is the function of the GVE fibers of the Glossopharyngeal nerve? Innervation to the parotid gland, lesser petrosal nerve/ auricotemporal branch of mandibular
What is the function of the SVE fibers of the Glossopharyngeal nerve? Innervation to the stylopharyngeus
What are the effects of Infranuclear Glossopharyngeal lesions? Loss of the gag reflex due to lesions of the nucleus ambiguus Loss of carotid sinus reflex Loss of taste in the posterior third of the tongue
The spinal root of the Accessory Nerve arises from which nucleus? Accessory
How does the spinal root of the Accessory Nerve enter the cranial cavity? Via the Foramen Magnum
Which muscles does the spinal root of the Accessory Nerve supply? SCM and Trapezius
The cranial root of the Accessory Nerve arises from which nucleus? Caudal part of the Nucleus Ambiguus
The cranial root of the Accessory Nerve continues along which nerve? The vagus nerve and is distributed through pharyngeal and laryngeal branches
Spinal accessory nerve lesions may result from: Stab wounds Removal of cancerous lymph nodes
What is the effect of Spinal accessory nerve lesion? Proximal to the SCM --> atrophy and paralysis of the muscle and weakness on turning the head opposite to the side of the lesion Atrophy of trapezius --> scalloping of the contour of the neck
What type of fibers does the Hypoglossal nerve contain? Mainly GSE
What muscles does the Hypoglossal nerve innervate? Intrinsic and Extrinsic muscles of the tongue not including the palatoglossus Afferent proprioceptive fibers from the muscle spindles of the tongue muscles
What is the origin and course of the Hypoglossal nerve? The Hypoglossal nucleus in the medulla oblongata lateral to the medial leminscus Emerges on the ventral surface of the medulla between the pyramid and inferior olive
What is the effect of a Hypoglossal nerve lesion?
Created by: Ulaisl