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Flashcards in Cranial Nerve and Functions Deck (29):
1

Cranial Nerve 1

Olfactory
Description: Conducts olfactory (smell), sensations to brain; only type of nervous tissue to regenerate.

Sensory Function: Olfaction (smell)

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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.

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What is Cranial Nerve II

Optic Nerve

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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

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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.

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What is CN III?

Oculomotor Nerve

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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

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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

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Name CN IV?

Trochlear Nerve

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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

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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

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What is the cranial Nerve V?

Trigeminal Nerve

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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

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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)

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What is CN VI

Abducens Nerve

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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

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Origin CN VI Abducens Nerve?

Nucleus in pons

Pathway: Leaves Cranium through superior orbital fissure and travels to lateral rectus muscle

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What is CN VII?

Facial Nerve

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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

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What is CN VIII

Vestibulocochlear Nerve

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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).

22

CN IX?

Glossopharyngeal Nerve

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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

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What is Cranial Nerve X?

Vagus Nerve

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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.

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What is Cranial Nerve XI?

Accessory Nerve

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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

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What is Cranial Nerve XII?

Hypoglossal Nerve

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What is the Function Hypoglossal Nerve (CN XII)

Somatic Motor: Efferent, bodies in nucleus of medulla oblongata, Terminates on muscles of tongue, genioglossus, hyopglossus and styloglossus ( innervates intrinsic and extrinsic tongue muscles)

name means under the tongue.