ERECTION
ERUPTION OF TEETH
An
endoscope
is passed down the
oesophagus, through the stomach, and
into the
duodenum.
A
catheter
is passed
through the endoscope into the com-
mon bile duct and pancreatic duct. A
contrast medium
is introduced through
the catheter to make the pancreatic
duct and ducts of the biliary system vis-
ible on X-rays. In some cases, it may be
possible to relieve a blockage due to a
gallstone during the procedure.
erection
The hardness, swelling, and
elevation of the
penis
that occurs in
response to sexual arousal or physical
stimulation. The erectile tissue of the
penis fills with blood as the blood ves-
sels in it dilate. Muscles around the
vessels contract and stop blood leaving
the penis, so maintaining the erection.
erection, disorders of
Conditions in
which the normal process of
erection
of
the penis is disrupted. They include
total or partial failure to attain or main-
tain erection (see
impotence
), persistent
erection in the absence of sexual desire
(see
priapism
), and curving of the penis
during erection (see
chordee
).
ergocalciferol
An alternative name for
vitamin D
2
(see
vitamin
D).
ergometer
A machine that measures
and records the amount of physical
work done and the body's response to
a controlled amount of exercise. An
ergometer makes continuous record-
ings, both during and after activity, of
heart-rate and rhythm (using an
ECG
),
blood pressure
, rate of breathing, and
volume of oxygen taken in from the air.
ergometrine
A drug given after
child-
birth
,
miscarriage
, or
abortion
in order
to reduce loss of blood from the
uterus
.
It works by causing blood vessels in the
uterine wall to contract.
ergot
A product of
claviceps purpurea,
a
fungus
that grows on cereals. Ergot
contains poisonous
alkaloids
, some of
which have medicinal properties when
taken in controlled doses. The drugs
ergotamine
and
ergometrine
are both
produced from ergot.
ergotamine
A drug used in the preven-
tion and treatment of
migraine.
erosion, dental
Loss of enamel from a
tooth's surface due to attack by
plaque
acids or other chemicals. Erosion of the
outer surfaces of the front teeth is most
frequently caused by excessive intake of
fruit juices and carbonated drinks. Ero-
sion of the inner surfaces of the molars
may be a result of the regurgitation of
stomach acid, as occurs in people suf-
fering from
acid reflux
or
bulimia.
(See
also
caries, dental.)
eroticism
The character and emotive
nature of sexual excitement. Sexual
arousal may be stimulated by erotic
thoughts, by touching the erogenous
zones, and by a variety of other sensa-
tions (such as the look and feel of
certain clothes).
eruption
The process of breaking out,
as of a skin rash or a new tooth.
eruption
of teeth
The process
by
which developing
teeth
move upwards
through the jawbone and break through
the gum to project into the mouth.
ERUPTION O FTEETH
Central incisors
Lateral
(6 months)
incisors (7-8
1st
months)
molars
UPPER
1)
(10-14
months)
TEETH
LOWER
fly?
M
TEETH
m
s '
Canines
2nd
Ms)
(16-18
molars
(2 years)
ß
months)
PRIMARY TEETH: AGES OF ERUPTION
Lateral incisors .
(7-9 years)
. Central
J2T
m
(6-8 years)
Premolars
- t g r
TB
(10-12
(w7)
(cp)
years)
UPPER
y
j)
-
3rd
w
TEETH
molars
2nd
(17-21
molars
©
LOWER
©
years)
(11-13
S
TEETH
I
years)
Canines
ray
CL
m l
Um
(9-12
CL
£5
\
1st molars
years)
___
yj
(6-7 years)
PERMANENT TEETH: AGES OF ERUPTION
208
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