chapter 13 Flashcards


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1

I Olfactory, Sensory function? Motor function?

sensory: yes (smell)
motor: no

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II Optic, sensory function? motor function?

Yes (vision)
no motor

3

III Oculomotor, sensory function? motor function?

sensory: no
Motor: no

4

IV (4) Trochlear, sensory function? motor function?

sensory:No
motor: yes

5

V (5) trigeminal, sensory function? motor function?

sensory: yes (general sensation)
motor: yes

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VI (6) Abducens, sensory function? motor function?

sensory: no
motor: yes

7

VII (7) facial, sensory function? motor function?

sensory:yes (taste)
motor: yes

8

VIII (8) Vestibulocochlear, sensory? motor>

sensory:yes (hearing)
motor: some

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IX (9) Glossopharyngeal, sensory? motor?

sensory: yes(taste)
motor: yes

10

X Vagus, sensory? motor?

sensory: yes (taste)
motor:yes

11

XI (11) Accessory, sensory? motor?

sensory: no
motor: yes

12

XII (11) Hypoglossal, sensory?motor?

sensory:no
motor: yes

13

Oh Once One Takes The Anatomy Final, Very Good Vacations Are Heavenly... 12 nerves

Olfacatory,optic, oculomotor, trochlear, trigeminal, abducens, fcial Vestibulocochlear, Glassopharyngeal, bagus, accerssory, hyoglossal

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Olfactory nerves

*Run from nasal mucosa to olfactory bulbs.
*pass through cribriform plate of ethmoid bone
*fibers sunapse in olfactory bulbs
*Pathway terminates in primary olfactory cortex

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Optic nerve

*Arise from retinas: really a brain tract
*pass through optic canal, converge, and partially cross over at Optic Chiasma
*optic tracts continue to thalamus
*optic radiation fibers run to occipital cortex

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Oculomotor nerve:

*fibers extend from ventral midbrain through superior orbital fissures to four of six extrinsic eye muscles.
*function in raising eyelid, directing eyeball, constricting iris, and controlling lens shape.

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Trochlear nerves:

*fibers from dorsal midbrain enter orbits via superior orbital fissures to innervate superior oblique muscle

*Primarily motor nerve that directs the eyeball

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Trigeminal nerves

*Largest cranial nerve; fibers extend from pons to face
* Three divsions
-ophthalmic: passes through superior orbital fissures
-Maxillary:passes through foramen rotundum
-mandibular: passes through the foramen ovale
*convey sensory impulses from various area of face
*supply motor fibers for mastication

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Abducens nerves:

*Fibers from inferior pons enter orbits via superior orbital fissures
*primarily a motor, innervating lateral rectus muscle

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Facial Nerve:

*fibers from pons travel through internal acoustic meatuses and emerge through stylomastoid foramina to lateral aspect of face.
*cheif motor nerves of face with five major
*Motor functions include facial expressions, parasympathetic impluses to lacrimal and salivary glands.
*sensory functions(taste) from anterior two thirds of tongue.

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Vestibulocochlear nerve:

*Afferent fibers from hearing receptors and equilibrium receptors pass from inner ear through internal acoustic meatuses and enter brain stem at pons medulla border

*mostly sensory function; small motor component for adjustment of sensitivity of receptors

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Glossopharyngeal nerves:

*Fibers from medulla leave skull via jugular foramen and run to throat
* motor functions: innervate part of tongue and pharynx for swallowing and provide parasympathetic fibers to parotid salivary glands
*Sensory functions: fibers conduct taste and general sensory impulses from pharynx and posterior tongue, and impulses from carotid chemoreceptors and baroreceptors.

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Vagus nerves:

*only cranial nerves that extend beyond head and neck region
*fibers from medulla exit skull via jugular foramen
*most motor: fibers are parasympathetic fibers that help regulate activities of heart, lungs and abdominal viscera
*sensory fibers carry impluses from thoracic and abdominal viscera, baroreceptors, chemoreceptors, and taste buds of posterior tongue and pharynx

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Accessory nerves:

*formed from ventral rootlets from C1 to C5 region of spinal cord (not brain)
*rootlets pass into cranium via each foramen magnum
* accessory nerves exit skull via jugular formina to innervate trapezius and sternocleidomastoid muscles
*formerly spinal accessory nerve

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Hypoglossal nerves:

*fibers from medulla exit skull via hypoglossal canal

* innercat extrinsic and intrinsic muscles of tongue that contribute to swallowing and speech

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8 pairs of cervical nerves

C1-C8

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12 pairs of thoracic nerves

T1- T12

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5 pairs of lumbar nerves

L1-L5

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5 pairs of sacral nerves

S1-S5

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1 pair of tiny coccygeal nerves

Co

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Ventral roots (front)

Contains motor (efferent) fibers from ventral horn motor neurons that innervate skeletal muscles

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Dorsal roots (back)

Contain sensory (afferent) fibers from sensory neurons in dorsal root ganglia that conduct impulses from peripheral receptors

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Hilton's Law

any nerve serving a muscle that produces movement at a joint also innervates that joint and skin over that joint.
(example: knee joint when extended the quads are moving, when its contradicted the hamstrings are moving)

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receptor

site of stimulus action

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sensory neuron

transmits afferent impulses to CNS

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intergration center

Either monosynaptic or polysynaptic region within CNS

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motor neurons:

conducts efferent impulses from integration center to effector organ

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Effector:

muscles fiber or gland cell that responds to efferent impulses by contracting or secreting