Flashcards in Cranial Nerve and Functions Deck (29):
Cranial Nerve 1
Description: Conducts olfactory (smell), sensations to brain; only type of nervous tissue to regenerate.
Sensory Function: Olfaction (smell)
Pathways of CN 1 Olfactory
Travels through Cribriform foramina of the ethmoid bone and synapses in the olfactory bulbs, which are located in the anterior cranial fossa.
Origin: Receptors (bipolar neurons) in olfactory mucosa of the nasal cavity.
What is Cranial Nerve II
Function of CN II?
Description: Special Sensory Nerve of Vision that is an outgrowth of the brain; known as the brain tract
Sensory Function: Vision
Pathway and Origin of CN II Optic Nerve?
Origin: Retina of the eye
Pathway: enters the cranium via optic canal of the Sphenoid bone; left and right optic nerves unite at optic chiasm. Optic tract travels to lateral geniculate nucleus of thalamus.
What is CN III?
Function of Oculomotor Nerve, CN III?
Description: Innervates upper Eyelid muscle abd four of the six extrinsic eye muscles
Somatic Motor Function: Supplies four Extrinsic eye muscles( superior rectus, Inferior rectus, medial rectus, inferior oblique) that move the eyesupplies levator palperbrae superiorismuscle to elevate eyelid
Parasympathetic Motor Function: Innervates sphincter pupillae of iris to make pupil constrict. Contracts cilliary muscles to make lens of eye more spherical
Origin and pathway of Oculomotor Nerve CN III
Origin: Oculomotor and Edinger Westphal nuclei within the mesencephalon
Pathway: Leaves Cranium via superior orbital fissure and travels to eye and eyelid
Name CN IV?
What is the Somatic Function Of CN IV?
Description: Innervated one extrinsic eye muscle that loops through a pulley shaped ligament
Somatic Function: Supplies one extrinsic muscle (superior Oblique) to move eye inferiorly and laterally
What is the Origin and Pathway oF CN IV?
Origin: Trochelar nucleus within the mesencephalon
Pathway: leaves cranium via superior orbital fissure and travels superior oblique
What is the cranial Nerve V?
What is the descriptionof the CN V ?
Description: This nerve cavity consists of three divisions opthalmic, maxillary and mandibular receives sensory impulses from face, oral cavity, nasal cavity and anterior scalp and innervates muscles masstication
What are the functions of the Trigerminal Nerve (CN V)?
Motor Function: Innervated muscles of Mastication ( mylohyoid, pterygoids, masseter, temporalis, anterior belly of digastric) tensor tympani. Cell bodies in the nuclei in pons
Sensory Function: Sesnory Stimuli for this nerve are touch, temperature and pain. Bodies in ganglion (trigeminal ganglion), Face _(skin, jaws, tongue,, sinuses, teeth), Opthalmic (V1); Maxillary (v2) and Mandibular (V3)
What is CN VI
What is the Function of Abducens Nerve (VI)?
Description: Innervates Lateral Rectus eye muscle. which abducts the eye( pulls away laterally)
Somatic Motor Function: Innervates one extrinsic eye muscle ( lateral rectus) for eye of abduction. Nuclei Pons
Origin CN VI Abducens Nerve?
Nucleus in pons
Pathway: Leaves Cranium through superior orbital fissure and travels to lateral rectus muscle
What is CN VII?
Function of CN VII Facial Nerve?
Sensory Function: Taste from anterior 2/3 of tongue. Celll bodies in ganglion
Somatic Motor Function (Efferent): The five major motor branches ( temporal, zygomatic, buccal, mandibular, and cervical) (To Zanzibar By Motor Car). Cell bodies in the nucleus in pons . Stylohyoid muscles of facial expression, posterior belly of digastric, buucinator, stapedius.
Parasympathetic : efferent perganglionic, Increases secretions of the lacrimal gland of the eye as well as the submandibuar and sublinguinal salivary gland
What is CN VIII
What is the Function of CN VIII Vestibulocochlear Nerve?
Sensory Function: Afferent sensory only, Innervates spiral Organ of Corti ( Cocholear branch) (Hearing), Innervates saccule and utricle and semicircular ducts (Veistibular branch) , (balance and movement).
What is the Function of Glossopharyngeal Nerve (CN IX)?
Afferent Sensory: Receptors in taste buds and posterior 1/3 of tongue and mucosa. Cell bodies in ganglion
Efferent Motor: Bodies in nucleus in medulla oblongata, terminates stylopharyngeus (Pharynx muscle)
Efferent Preganglionic Paray sympathetic: increases secretion of parotid salivary gland
What is Cranial Nerve X?
What are the functions of Vagus Nerve (CN X)
Parasympathetic Efferent: Preganglionic, Innervates the visceral smooth muscle, Cardiac muscle and glands of heart, lungs Pharynx, larynx, trachea and most abdominal.
Motor Efferent: Cell bodies in nucleus in medulla oblongata. Terminates on muscles of Larynx and Pharynx.
Sensory Afferent: Bodies in ganglion, Receptors in mucosa of larynx, alimentary canal to left of colic flexure, lungs and bronchii.
What is Cranial Nerve XI?
Function of Accessory Nerve (CN XI)
Efferent Motor Only. Bodies in the nucleus in medulla oblongata, Terminates on sternocleidomastoid and Trapezius.
Crainial Root: Travels with CN X fibers to pharynx
What is Cranial Nerve XII?