Definition of Medullary
Med´ul`la`ry
a.
1.
(Anat.)
Pertaining
to
,
consisting
of
,
or
resembling
,
marrow
or
medulla
.
2.
(Bot.)
Filled
with
spongy
pith
;
pithy
.
Medullary groove
(Anat.)
a
groove
,
in
the
epiblast
of
the
vertebrate
blastoderm
,
the
edges
of
which
unite
,
making
a
tube
(
the
medullary
canal
)
from
which
the
brain
and
spinal
cord
are
developed
.
Medullary rays
(Bot.)
the
rays
of
cellular
tissue
seen
in
a
transverse
section
of
exogenous
wood
,
which
pass
from
the
pith
to
the
bark
.
Medullary sheath
(Anat.)
the
layer
of
white
semifluid
substance
(
myelin
),
between
the
primitive
sheath
and
axis
cylinder
of
a
medullated
nerve
fiber
.
Related Words
bone
marrow
,
marrow
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