Chpt 16 (13) - Sensory Systems Flashcards Preview

Medical Terminology > Chpt 16 (13) - Sensory Systems > Flashcards

Flashcards in Chpt 16 (13) - Sensory Systems Deck (66):
1

Sensory Receptors

- Specialized receptor cells
- Receive stimuli specific to the type of information specific to that organ
- Send information through afferent nerves
- To CNS (Central Nervous System)

2

Eye

3 Layers:
- Sclera = outermost, white in color
- Choroid = Middle, pigmented
- Retina = Innermost, controls the photoreceptor cells (Rods, Cones)

Cornea - outer "clear" membrane; refraction
Pupil - Light passes through Iris (colored portion)
Lens - Clear, transparent structure for magnification
- Ciliary body changes shape; accommodation
Uvea - Iris + Ciliary Body + Choroid

3

Sensory System

Any organ or anatomical structure involved with receiving and perceiving sensory stimuli

- Sight, Touch, Hearing, Smell
- Afferent nervous Stimuli
- Specialized Nerve Endings (dendrites or receptor cells) i.e. Rods, Cones, Taste receptors
- Electrochemical signaling from periphery to brain

4

Eye

Retina - Interior Layer
Photoreceptors - Rods and Cones
- Rods (Black & White)
- Cones (Color): Converge to become Optic Nerve

Optic Disc - Where optic nerve exits eye

Macula - Area of sharpest focused vision
- Center = Fovea

5

Eye Anatomy

Anterior = between the cornea and iris

Posterior = between the iris and lens
- Aqueous Humor

Vitreous = Posterior to lens
- Vitreous Humor

6

Ear: Structure & Function

- Hearing & Equilibrium
- External; Middle; Inner
- Auricle (pinna)
- Outer (funnel)
- Meatus
- Middle:
- Tympanic membrane
- Malleus, Incus, Sta
- Eustachian Tube
- Inner Ear:
- Cochlea =>Oran of Corti
- Hair Cells; Neuronal Aspect of Hearing

7

Two Aspects of Hearing

Conductive = External & Middle Ear

Neuro-sensory = Inner-Ear / Auditory nerve

8

Audi (o) / Audit (o)

Hearing

9

Aur (o) / Auricul (o)

Hearing

10

Blephar (o)

Eyelid

11

Cerumin (o)

Wax

12

Cochle (o)

Cochlea

13

Cor (o) / Core (o)

Pupil

14

Cycl (o)

Ciliary Body

15

Dacry (o)

Tears

16

Ir (o) / Irid (o)

Iris

17

Kerat (o)

Cornea

18

Lacrim (o)

Tears

19

Mastoid (o)

Mastoid Process

20

Myring (o)

Ear Drum or Middle Ear

21

Nas (o)

Nose

22

Ocul (o)

Eye

23

Phac (o)

Lens

24

Phak (o)

Lens

25

Retin (o)

Retina

26

Scler (o)

White of eye

27

Scot (o)

Darkness

28

Tympan (o)

Eardrum or Middle Ear

29

Uve (o)

Uvea

30

Opt (o) / Optic (o)

Eye

31

Opthalm (o)

Eye

32

Ossicul (o)

Meaning ossicle or bones of middle ear

33

AD

Right Ear

34

AS

Left Ear

35

AU

Both Ears

36

OD

Right Eye

37

OS

Left Eye

38

OU

Both Eyes

39

IOL

Intra-Ocular Lens

40

IOP

Intra-Ocular Pressure

41

dB

Decibel

42

PERRLA

Normal Eye Exam

43

VA

Visual Acuity

44

Tonometry

Measure of pressure inside eye

45

Diopter

Unit of refraction power to correct vision

46

Otoscopy

Examination of ear through scope

47

Audiometry

Measurement of hearing frequencies of deficit

48

Refractive Disorders

Astigmatism = Distortion of sight as light rays do not come to a single focus on retina

Hyperopia = "Farsightedness" - focusing of light rays behind the retina

Myopia = "Nearsightedness" - focus of light in front of retina

49

Strabismus

Eye misalignment (cross-eyed)

50

Diplopia

Double Vision

51

Cataracts

Cloudiness or haziness of lens

52

Glaucoma

Increased pressure inside the eye due to aqueous humor excess

53

Macular Degeneration

Loss of macula leading to loss of central vision

54

Nyctalopia

Night blindness

55

Chalazion

Nodular inflammation of eyelid

56

Keratitis

Inflammation of cornea

57

Anacusis

Total loss of hearing

58

Paracusis

Impaired hearing

59

Presbyacusis

Age related hearing loss

60

Otosclerosis

Scarring or hardening of bones in middle ear

- conductive hearing loss

61

Tinnitus

Ringing in the ear

62

Otalgia

Ear pain

63

Cholesteatoma

Fatty cyst in middle ear

64

Menicre's

Vertigo and dizziness

65

Mydriatic

Dilates the pupil

66

Miotic

Contracts the pupil