Webster's New World Medical Dictionary

trisomy 21 syndrome
See 
Down syndrome.
tRNA
Transfer RNA.
trochanter
One of the bony prominences toward
the near end of the thighbone (the femur). There
are two trochanters:
•
The greater trochanter
A powerful
protrusion located at the proximal
(near) and lateral (outside) part of the
shaft of the femur. The greater trochanter
is also called the major trochanter, the
outer trochanter, and the lateral process
of the femur.
•
The lesser trochanter
A pyramidal
prominence that projects from the proxi-
mal (near) and medial (inside) part of
the shaft of the femur. The lesser
trochanter is also called the minor
trochanter, the inner trochanter, and the
medial process of the femur.
The trochanters are points at which hip and thigh
muscles attach. The greater trochanter gives attach-
ment to a number of muscles (including the gluteus
medius and minimus, piriformis, obturator internus
and externus, and gemelli muscles), and the lesser
trochanter receives the insertion of several muscles
(including the psoas major and iliacus muscles).
trochlear nerve
The nerve that controls the
superior oblique muscle of the eye, one of the mus-
cles that move the eye (extraocular muscles).
Paralysis of the trochlear nerve results in rotation of
the eyeball upward and outward (and, therefore, in
double vision). The trochlear nerve is the fourth
cranial nerve, and it is the only cranial nerve that
arises from the back of the brain stem. It follows the
longest course within the skull of any of the cranial
nerves.
triiodothyronine
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