8. eye and ear Flashcards Preview

Anatomy 3402 - 2nd Half > 8. eye and ear > Flashcards

Flashcards in 8. eye and ear Deck (33):
1

sclera

dense connective tissue
- white of eye

2

cornea

transparent region of anterior eye
- allows light in to refract it

3

iris

circular structure at anterior eye that gives it colour

4

pupil

central opening of iris
- size controls amount of light getting in

5

muscles controlling pupil size

dilator papillae
sphincter papillae

- found within eye

6

ciliary muscle action

change lens shape for focusing

7

muscle type of internal eye

smooth muscles

8

5 eye muscles innervated by the occulomotor nerve?

inferior rectus
medial rectus
superior rectus
inferior oblique
levator palpebrae

9

innervated by trochlear nerve

superior oblique

10

innervated by abducent nerve

lateral rectus

11

role of opthalamic nerve

senses touch to cornea, discomfort and reflex to close eye

12

superior oblique innervation and action

inn - trochlear nerve

act
- rolls eye outward and downward
-medial rotation

13

levator palpebrae superioris innervation and action

innervation
- occulomotor nerve

action
- elevates superior eyelid

14

superior rectus muscle innervation and action

innervation
- occulomotor nerve

action
- rolls eye upward

15

lateral rectus innervation and action

innervation
- abducent nerve

action
- roll eye outward

16

medial rectus innervation and action

innervation
- occulomotor nerve

action
- roll eye inward

17

inferior rectus innervation and action

innervation
- occulomotor nerve

action
- role eye downward

18

inferior oblique muscle innervation and action

innervation
- occulomotor

action
- roll eye upward and outward
- rotates eye laterally

19

orbital septum

structure around eye
- there to create a closed structure

20

orbicularis oculli

most superficial muscle surrounding orbital septum

21

covering optic nerve as it passes through optic canal

sclera

22

Retina

inner layer of eyeball that is sensitive to light
- creates vision
- rod and cone cells
- continuous with optic nerve

23

small disks that reflect light to focus on retina

lens

24

Vitrous anterior and posterior chambers

viscous fluid like substance that gives eyeballs its shape
- ant. raised cornea shape

25

pathway of light
- near vs farsightedness

nearsightedness - cross
farsightedness - wide

26

External ear

- auricular fibrocartilage covered in skin
- external acoustic meatus

27

middle ear

tympanic membrane (eardrum)

3 ossicles
- malleus
- incus
- stapes

28

inner ear structures

utricle
saccule
semicircullar canals and ducts
cochlear duct

29

tympanic membrane function

transmits soundwaves via vibrations from outside of ear to the ossicles

30

ossicles function

malleus, incus and stapes
- transmit sound waves to cochlear duct

31

semicircular canal and cochlear fucntion

boney structures that contain semicircular duct and cochlear duct

32

cochlear duct function

hearing organ
- filled with fluid that vibrates and stimulates Rc cells

33

semicircular duct, saccule and utricle

organs related to balance
- vestibular system
- movement and orientation of the head