The A to Z of Anatomical Histological and Medical terms
A
Neurotransmitter (new’-ro-TRANS-miht-ah) a molecule that
B
transmits or inhibits the transmission of a nerve impulse from one
neuron to another across a synapse.
C neutro- neutral
Neutrophil (NEW-tro-fihl) a type of granular, phagocytic WBC
D
characterized by a cytoplasm that stains pink/purple in a neutral stain
E
i.e. does not preferentially take up either acid or base of the stain.
nigra: Lt. niger = black, dark.
F
noci- pain (noh-see)
G
node: Lt. nodus = knot.
Node of Ranvier (rahn’-vee-A) a gap in the myelin sheath covering a
H
nerve fiber. It accelerates the rate of impulse conduction.
I
nodule: diminutive of Lt. nodus = knot, hence, a little knot.
norma: Lt. = pattern or rule, or aspect; adj. normal - according to
J rule.
notch: an indentation in the margin of a structure in organs
K
(e.g. liver, frontal bone).
L
notochord: Gk. notos = back, and chorde = cord; hence, the
primitive axial skeleton around which the vertebrae develop, parts
M
persisting in the nuclei pulposi.
N
nucha- nape of the neck (new-kah-)
nucha: French nuque = nape or back of the neck; adj.- nuchal.
O
Nucleolus (new-KLEE-o-luhs) a spherical body w/n the nucleus of a
P
cell, not bound by a plasma membrane. It functions in the storage of
ribosomal RNA.
Q Nucleus (NOO-klee-uhs) the largest structure in a cell. It contains the
genetic material to determine protein structure and function, the DNA,
R
and is enveloped by a double-layered plasma membrane. (also, the
S
dense core of an atom containing protons and neutrons).
nucleus: Lt. = kernel or nut; may refer to the vital centre of a cell
T
body, or to a cluster of neuron cells in the CNS; adj.- nuclear.
U
nystagmus: Gk. = drowsiness, to nod, hence, involuntary, rapid,
rhythmic eye movements.
V
W
X
Y
Z
121 © A. L. Neill
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