Orbit/Ear

Question 1

Eye blood supply

Answer 1

Ophthalmic a.

Question 2

Eye innervation

Answer 2

CN II-Sight
CN III- parasympathetic
CN V1- gen sensory

Question 3

Cornea function

Answer 3

Protects eye, clear membrane for passage of light, refracts light

Question 4

Sclera function

Answer 4

Protects eye

Question 5

Anterior chamber function

Answer 5

Contains aqueous humor-light passes through chamber through pupil

Question 6

Iris function

Answer 6

Contractile aperture controlling amount of light into eye

Question 7

Lens function

Answer 7

Assists in refraction for visual focus

Question 8

Posteriod chamber function

Answer 8

Contains vitreous humor to structurally support retina while transmitting light

Question 9

Retina function

Answer 9

Detects light

Question 10

Lacrimal gland blood supply

Answer 10

Supra orbital a.( branch to lacrimal)

Question 11

Lacrimal gland innervation

Answer 11

Lacrimal nerve from CN V1(gen sensory)
CN VII(parasympathetic)

Question 12

Nasolacrimal duct function

Answer 12

Drains tears from orbit into nasal cavity

Note: Connects to inferior meatus

Question 13

Malleus function

Answer 13

Transmits vibrations to inner ear to be detected as sound

Note: First ossicle in chain-contacts tympanic membrane. Chorda tympani branch of CN VII to lingual nerve passes between malleus and incus over tensor tympani muscle

Question 14

Incus function

Answer 14

Transmits vibrations to inner ear to be detected as sound

Note :Second ossicle in chain

Question 15

Stapes function

Answer 15

Transmits vibrations to inner ear to be detected as sound

Note: Third ossicle in chain-contacts oval window of inner ear

Question 16

Tympanic membrane function

Answer 16

Vibrates to transmit soundwaves to ear ossicles

Question 17

Tympanic membrane blood supply

Answer 17

Maxillary a.

Question 18

Tympanic membrane innervation

Answer 18

CN VIII

Note:eardrum

Question 19

Semilunar canals function

Answer 19

Detects 3D acceleration of body to maintain balance and spatial awareness

Question 20

Semilunar canals innervation

Answer 20

Vestibular portion of CN VIII

Question 21

Cochlea function

Answer 21

detects sound

Question 22

Cochlea innervation

Answer 22

Cochlear portion of CN VIII

Question 23

Auditory tube (Eustachian or Pharyngotympanic tube) function

Answer 23

Passage between nasopharynx and middle ear to maintain atmospheric pressure in middle ear

Note:

Question 24

Auditory tube (Eustachian or Pharyngotympanic tube) blood supply

Answer 24

Maxillary a.

Question 25

Auditory tube (Eustachian or Pharyngotympanic tube) innervation

Answer 25

CN V2, CN VIII

Question 26

Levator palpebrae superioris innervation

Answer 26

CN III

Question 27

Levator palpebrae superioris function

Answer 27

elevates superior eyelid

Question 28

Superior rectus function

Answer 28

From straight view: elevates, adducts, medially rotates eyeball

Question 29

Superior rectus function innervation

Answer 29

CN III