chapter 13 Flashcards
I Olfactory, Sensory function? Motor function?
sensory: yes (smell)
II Optic, sensory function? motor function?
III Oculomotor, sensory function? motor function?
IV (4) Trochlear, sensory function? motor function?
V (5) trigeminal, sensory function? motor function?
sensory: yes (general sensation)
VI (6) Abducens, sensory function? motor function?
VII (7) facial, sensory function? motor function?
VIII (8) Vestibulocochlear, sensory? motor>
IX (9) Glossopharyngeal, sensory? motor?
X Vagus, sensory? motor?
sensory: yes (taste)
XI (11) Accessory, sensory? motor?
XII (11) Hypoglossal, sensory?motor?
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
*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
*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
*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.
*fibers from dorsal midbrain enter orbits via superior orbital fissures to innervate superior oblique muscle
*Primarily motor nerve that directs the eyeball
*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
*Fibers from inferior pons enter orbits via superior orbital fissures
*primarily a motor, innervating lateral rectus muscle
*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.
*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
*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.
*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
*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
*fibers from medulla exit skull via hypoglossal canal
* innercat extrinsic and intrinsic muscles of tongue that contribute to swallowing and speech
8 pairs of cervical nerves
12 pairs of thoracic nerves
5 pairs of lumbar nerves
5 pairs of sacral nerves
1 pair of tiny coccygeal nerves
Ventral roots (front)
Contains motor (efferent) fibers from ventral horn motor neurons that innervate skeletal muscles
Dorsal roots (back)
Contain sensory (afferent) fibers from sensory neurons in dorsal root ganglia that conduct impulses from peripheral receptors
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)
site of stimulus action
transmits afferent impulses to CNS
Either monosynaptic or polysynaptic region within CNS
conducts efferent impulses from integration center to effector organ
muscles fiber or gland cell that responds to efferent impulses by contracting or secreting