The A to Z of Anatomical Histological and Medical terms
A
rete: Lt. = a net; hence, a network of veins or tubules.
B
reticular: adj.Lt. reticulum = small net; hence having a network.
reticulum: diminutive of Lt. rete = net; adj.- reticular.
C Retina (REHT-ih-nah) the light-sensitive inner layer of the eye
containing rod and cone cells.
D
retina: derivation uncertain - the innermost of the 3 layers of the
E
eyeball.
retinaculum: Lt. = a tether; hence, a thickened band of deep
F
fascia which retains tendons or the patella.
G
retract: Lt. re = back, and tractum = pulled; to pull something
back, and retraction - the act of retracting.
H
retro- located behind
I
retro: prefix - Lt. = backwards.
retroflexion: Lt. retro = backwards, and flexion = bent; the
J position of being bent backwards, applied to the angulation of the
body of the uterus on the cervix.
K
retroversion: Lt. retro = backwards, and version = turned; the
L
position of being turned backwards, applied to the angulation of
the cervix uteri on the vagina.
M
rhabdo- striated striped
N
rhe- flow
rhin- nose
O
rhinencephalon: Gk. rhinion = nostril, & enkephalos = brain; the
P
brain tissue concerned with smell
rhombencephalon: Gk. rhombos = rhomboid, & enkephalos =
Q brain; hence, the hind-brain: consisting of the medulla
R
oblongata, pons and cerebellum, which enclose the rhomboid
fossa (floor of 4th ventricle).
S
rhod- red
rhomboid: adj. Gk. rhombus = a figure with 4 equal sides, not at
T
right angles, the shape of a rhombus.
U
Ribosome (RYE-boh-zome) a microscopic, spherical structure w/n the
cytoplasm of a cell composed of RNA and protein. It serves as an
V
attachment site for messenger RNA during protein synthesis.
W
rima: Lt. = chink; hence, e.g., rima palpebrarum = the chink b/n
the free edges of the eyelids.
X risorius: Lt. risor = scoffer; risorius is the “smiling” muscle
drawing the corners of the mouth laterally.
Y
Rod cell a photoreceptor cell in the retina of the eye that detects very
Z
low levels of light.
137 © A. L. Neill
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