Unit 16- Chapter 26 Flashcards
(25 cards)
parts of eye-6
retina- back of eye - sensory receptors for light
cornea- admits light rays in eyeball
iris/retina- regulate amount of light into eye
lens- focus light rays on retina
sclera- protection for inner eye structures ( whites )
conjuctiva- protective mucous membrane (pink)
choroid- middle of eye ( blood supply )
3 layers of eye
sclera, choroid, retina
vision requires 4 proper functions
muscles to move eyes
correct amount of light
correct focus
optic nerve to brain
parts of ear
pinna(auricle)- external . visible part of ear external auditory canal middle ear( 3 bones) inner ear- bony chambers (tympanic membrane-eardrum)
ear is responsible for two sensors
two nerves
hearing and equilibrium
cochlear nerve carries hearing information, and the vestibular nerve carries equilibrium
what is the (the sensory organ for hearing)
the cochlea
The practitioner should be MOST suspicious of a Le Fort fracture if a patient who experienced massive blunt force trauma to the face presents with:
mobility of the facial bones.
where is the vitreous humor located in eye
It is a clear, jellylike fluid near the back of the eye that cannot be replaced if it is lost.
where can you palpate the superficial temporal artery
just anterior to tragus of ear
4 major bones of face include
nasal, maxilla, zygomas ( cheekbones ), mandible
how much of nose is bone
1/3
what is the adams apple
centre of neck, upper larnyx, thyroid cartilage
what is between thyroid and cricoid cartilage
cricothyroid membrane
what main muscles makes up the nexk
sternocleidomastoid muscles
what is diameter of eye and where is it located
1”
80 % protected from by orbit
two fluid chambers that hold structure of eye and their location
vitreous fluid, jellylike, back of eye
aqueous fluid, front of lens
what is sclera and where does cornea start
strong fibrous tissue that maintains structure, and cornea replaces it at front of eye
3 bones of middle ear
malleus, incus , stapes
middle ear connected to nasal cavity by what
eustachian tube
3 le fort fractures and what they effect
fracture of maxilla
1-separate hard palate and lower maxilla from rest
2- nasal bone and inferior maxilla
3- separate entire midface from carnium
eye surgery needs to be conducted in ___ mins or permanent blindness may occur
30
3 guidlines for penetrating injuries to eye
1- never exert pressure injured eye
2- moist sterile dressing
3- protect eye with shield, close both eyes
two locations of epistaxis
anterior- from septum, bleeds forward
posterior- severe and drain into throat
Cerebrospinal fluid may leak from ears and nose following a
basal skull fracture
