The document discusses the senses of smell and hearing. It describes how odor particles activate smell receptors in the nose and how ear wax and membranes in the ear canal can block particles from reaching sensory regions. When sick, inflamed nasal membranes may prevent odors from reaching the olfactory bulb. The document also notes that bugs can occasionally enter the ear, and that alcohol drops or doctor visits may help remove them.

1. The Olfactory
System
Sense of Smell

3. Can you smell the
roses?

6. Odor particles drift into
your nose and cause
your smell receptors to
send messages to your
brain.

8. But when you are sick, it’s
another story

10. Inflamed membranes
will not allow the odor
particles to reach the
olfactory bulb.

11. What did you say?

12. The Ear

13. Bugs can get in your
ears, believe it or not.

15. All you have to do if the
bug is alive pour a few
alcohol drops in the
ear. If it comes out
good, if not go to the
doctor.

17. The normal
tympanic
membrane is thin
and semi-
transparent.

19. Wax, or cerumen, is a
normal secretion in the
cerumenous glands in
the outer part of the
meatus, and can
obscure or partially

21. Acute middle ear
infection with effusion.
The handle of the
malleus is obscured,
and fluid levels are
obvious behind the
drum.

23. Acute otitis media
with no
recognizable
landmarks.

25. Appearance of
serous
(secretory) otitis
media.

27. Fluid behind the
ear drum in an
asymptomatic
child.

29. Resolution of middle
ear effusion. The
handle of the
malleus is still
foreshortened and
the horizontal.

31. Serous otitis media.
There is in drawing
of a dull ear drum
and the handle of
the malleus is
characteristically
horizontal.

33. Tympanosclerosis. In
some cases of otitis
media healing may not
be completed and the
inflammatory process
leads to the formation
of scar tissue.

35. Central perforation
of the ear drum.
Perforations are
usually single but
may be multiple.

37. Grommet – tympanostomy
tube. Grommets can be
inserted in the tympanic
membrane if medical
treatment and myringotomy
are unsuccessful and the
child has persistent middle
ear effusion.

39. The End