ZOPICLONE
ZYGOTE INTRAFALLOPIAN TRANSFER
but dog bites are a common cause of
human infection worldwide.
Other zoonoses are transmitted from
animals less obviously associated with
humans, usually by insect
vectors.
For
example,
yellow fever
is transmitted by
mosquito bites. (See also
dogs, diseases
from; cats
,
diseases from; rats
,
dis-
eases from; insects and disease.)
zopiclone
A drug used in the short-term
treatment of
insomnia.
It has a brief dura-
tion of action and causes little hangover
effect. Side effects include a bitter metal-
lic taste, nausea, and dry mouth.
Z-plasty
A technique that is used in
plastic surgery
to change the direction
of a pre-existing scar so that it can be
hidden in natural skin creases, or to
relieve skin tension caused by the
con-
tracture
of a scar. Z-plasty is especially
useful for revising unsightly scars on
the face and for releasing scarring across
those joints, such as on the fingers or in
the armpits, that may restrict normal
movement or cause deformity.
zygomatic
arch The arch of bone,
commonly known as the cheek bone, on
either side of the
skull
just below the eye
socket. The zygomatic arch is formed of
the zygomatic and temporal bones.
.
3
?
Mandible
zygote
The cell that is produced when a
sperm
fertilizes an
ovum.
A zygote, mea-
suring about 0.1 mm in diameter in
humans, contains all the genetic mat-
erial for a new individual. The zygote is
surrounded
by
a
protein-rich
layer
known as the
zona pellucida.
ZYGOTE
Zona pellucida
Zygote
The zygote travels down
1 of the
woman's
fallopian tubes,
dividing as it
does so. After about a week, the mass of
cells (now called a blastocyst) implants
into the lining of the uterus, and the next
stage of embryological growth begins.
(See also
embryo; fertilization.)
zygote intrafallopian transfer A type
of
in vitro fertilization
, also referred to as
ZIFT, in which
ova
are fertilized outside
the body and returned to a
fallopian
tube
rather than to the
uterus
.
607
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