Module 3 Flashcards
(179 cards)
- tubular stalk-like part of the brain made up of midbrain, pons and medulla oblongata from above down
BRAINSTEM
MIDBRAIN
- CN III oculomotor
- CN IV trochlear
PONS
- CN V trigeminal
- CN VI abducens
- CN VII facial
- CN VIII vestibulocochlear
MEDULLA
- CN IX glossopharyngeal
- CN X vagus
- CN XI accessory nerve
- CN XII hypoglossal
- carries information from olfactory bulb to the olfactory areas of the cerebral cortex
- does not go through the thalamus
- go through amygdala (center for memory and emotion)
- CN I olfactory nerve
- special somatic afferent pathway concerned with reception and transmission of visual impulse and perception of vision or sight
- rods (black and white)
- cones (colored)
- made up of ganglionic cells
- CN II optic nerve
- carry nasal field
- TEMPORAL FIBER
- carry the temporal field
- NASAL FIBER
- loss of half field of vision
- HEMIANOPIA
- same half of field of vision is lost in both eyes
- HOMONYMOUS HEMIANOPIA
- lesion before the optic chiasm
- MONOCULAR VISUAL PROBLEM
- lesion after the optic chasm
- BINOCULAR VISUAL LOSS
- supplies majority of the extrinsic as well as the intrinsic muscles of the eyeball
- CN III ocolumotor
- EXTRINSIC
- superior rectus (looking up, down and out eye)
- inferior rectus (looking down)
- medial rectus (moves the eye towards nose)
- inferior oblique (elevates the eyeball)
- levator palpebrae superioris (elevate the eyelid)
- INTRINSIC
- sphincter pupillae (constrict pupils)
- ciliary muscles or ciliaris (for accommodation)
- drooping of eyelid due to elevator palpebrae superiors
- PTOSIS
- due to unopposed action of lateral rectus because of paralysis of medial rectus
- LATERAL STRABISMUS
- due to paralysis of sphincter pupillae; loss of light reflex
- MIDRIASIS (dilation of pupil)
- due to paralysis of extrinsic muscle
- DIPLOPIA
- contralateral hemiplegia due to damage of crus cerebri
- WEBER SYNDROME
- located in the tegmentum of the midbrain
- supplies the superior oblique - depresses the eyeball (downward gaze)
- only cranial nerve that emerges from the dorsal aspect of the brainstem
- CN IV TROCHLEAR NERVE
- thickest and largest sensory nerve
- CRANIAL NERVE V TRIGEMINAL NERVE
- corneal reflex
- sensation in the uppercase up to the forehead including the conjunctiva
- V1: ophthalmic nerve
- sensation from maxillary teeth and gums
- V2: maxillary nerve