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AP Psychology 1.5 Sensation and Perception. Where do the optic nerves cross each other on their way into the brain hemispheres?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour brought to you by optic nerves [eye balls dangling across each other]

00:07

crossing each other and then double crossing each other in the summers

00:10

biggest blockbuster eye versus eye or not. Alright here's our question where do the

00:17

optic nerves cross each other on their way into the brain hemispheres, here are your

00:22

potential answers.... Alright well there's pretty big spoiler built right into the

00:28

question but the last time we spoiled something our buddies refuse to speak to [Guy holding a Harry Potter book and friends dressed in wizard hats]

00:31

us for a month well while we're running from the angry mob let's check out a

00:38

diagram of an eyeball alright since we're talking about optic nerves we can [diagram of inside an eye ball]

00:43

highlight that part of the diagram and we can see, okay weak pun, well we can see

00:48

that there's only one optic nerve per eye. So when we see a question asking about

00:53

optic nerves emphasis on nerves.. We know that whatever we're talking about isn't [Diagram of two optic nerves attached to the eye balls]

00:59

taking place within the eye itself with that in mind we can easily eliminate A

01:04

the fovea we know the fovea centralis refers to a grouping of concentrated [cones appearing out of a persons eye ball]

01:10

cones in the eye that are responsible for sharp central vision so we can see

01:14

this one through the door and since a blind spot simply refers to an area of [a plane in a cars side mirror]

01:18

our visual field that lacks light detecting cells on our retina and not an

01:23

actual physiological part of the body we can eliminate this guy too. The rest of [a dog blindfolded]

01:29

our answers do fit the not in our eyeball but definitely an actual

01:34

physiological thing criteria, funnily enough that's the scientific name for

01:38

these guys really you'll find out in ophthalmology school anyway we can [C and D sat in a lecture theatre]

01:43

eliminate one of these immediately and that's because we know that Pierre Paul

01:46

Broca was a 19th century French physician best known for his research in [Pierre examining a mans mouth]

01:50

speech production Broca's area was aptly named because it's a part of the frontal

01:56

lobe that is directly linked with speech production not vision that leaves us [image of Pierre's frontal lobe]

02:01

with the lateral geniculate nucleus and the optic chiasm but only one of these

02:07

guys is where the optic nerves cross each other on their way into the brain

02:10

hemispheres and that would be E the optic chiasm

02:13

who'd of thunk it right the optic chiasm right there is the space just in front [Two people dangle down a rope from hole]

02:19

of the pituitary gland where the optic nerves cross one another through the

02:23

brain on their way to the respective lobes and it's actually the only place [Two eyes meet at a dining table]

02:27

any parts of each eye really meet, though we here eye-harmony is coming soon and

02:32

there's hope for all the lonely hearts out there yet [advert for eye harmony]

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