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siphuncle    
腹管

腹管

Siphon \Si"phon\, n. [F. siphon, L. sipho, -onis, fr. Gr. ??? a
siphon, tube, pipe.]
1. A device, consisting of a pipe or tube bent so as to form
two branches or legs of unequal length, by which a liquid
can be transferred to a lower level, as from one vessel to
another, over an intermediate elevation, by the action of
the pressure of the atmosphere in forcing the liquid up
the shorter branch of the pipe immersed in it, while the
continued excess of weight of the liquid in the longer
branch (when once filled) causes a continuous flow. The
flow takes place only when the discharging extremity of
the pipe ia lower than the higher liquid surface, and when
no part of the pipe is higher above the surface than the
same liquid will rise by atmospheric pressure; that is,
about 33 feet for water, and 30 inches for mercury, near
the sea level.
[1913 Webster]

2. (Zool.)
(a) One of the tubes or folds of the mantle border of a
bivalve or gastropod mollusk by which water is
conducted into the gill cavity. See Illust. under
{Mya}, and {Lamellibranchiata}.
(b) The anterior prolongation of the margin of any
gastropod shell for the protection of the soft siphon.
(c) The tubular organ through which water is ejected from
the gill cavity of a cephaloid. It serves as a
locomotive organ, by guiding and confining the jet of
water. Called also {siphuncle}. See Illust. under
{Loligo}, and {Dibranchiata}.
(d) The siphuncle of a cephalopod shell.
(e) The sucking proboscis of certain parasitic insects and
crustaceans.
(f) A sproutlike prolongation in front of the mouth of
many gephyreans.
(g) A tubular organ connected both with the esophagus and
the intestine of certain sea urchins and annelids.
[1913 Webster]

3. A siphon bottle.
[1913 Webster]

{Inverted siphon}, a tube bent like a siphon, but having the
branches turned upward; specifically (Hydraulic
Engineering), a pipe for conducting water beneath a
depressed place, as from one hill to another across an
intervening valley, following the depression of the
ground.

{Siphon barometer}. See under {Barometer}.

{Siphon bottle}, a bottle for holding aerated water, which is
driven out through a bent tube in the neck by the gas
within the bottle when a valve in the tube is opened; --
called also {gazogene}, and {siphoid}.

{Siphon condenser}, a condenser for a steam engine, in which
the vacuum is maintained by the downward flow of water
through a vertical pipe of great height.

{Siphon cup}, a cup with a siphon attached for carrying off
any liquid in it; specifically (Mach.), an oil cup in
which oil is carried over the edge of a tube in a cotton
wick, and so reaches the surface to be lubricated.

{Siphon gauge}. See under {Gauge}.

{Siphon pump}, a jet pump. See under {Jet}, n.
[1913 Webster]


Siphuncle \Si"phun`cle\, n. [L. siphunculus, sipunculus, dim. of
sipho. See {Siphon}.] (Zool.)
The tube which runs through the partitions of chambered
cephalopod shells.
[1913 Webster]


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  • Siphuncle - Wikipedia
    The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusc Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and Spirula
  • Siphuncle | invertebrate anatomy | Britannica
    In the cephalopods Nautilus and Spirula, the planospirally coiled shell consists of multiple chambers connected by a porous tube called the siphuncle The chambers contain quantities of water and gas that are adjusted by the siphuncle to achieve neutral buoyancy
  • Siphuncle Controls Buoyancy — Biological Strategy — AskNature
    Reaching through the interior of the shell is a tubular structure called the siphuncle The nautilus uses this organ to control the volumes of water and gases within each of its shell chambers to regulate its buoyancy
  • SIPHUNCLE Definition Meaning - Merriam-Webster
    The meaning of SIPHUNCLE is a membranous tubular extension of the mantle which runs through the partitions of the chambers to the apex of a shelled cephalopod : siphon
  • Siphuncle Explained
    What is the Siphuncle? The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk
  • siphuncle, n. meanings, etymology and more | Oxford English Dictionary
    siphuncle, n meanings, etymology, pronunciation and more in the Oxford English Dictionary
  • The Evolution and Development of Cephalopod Chambers and Their Shape
    A thin organic strand, called the siphuncle, runs through all phragmocone chambers and connects this with the rear of the soft body that sits in the body chamber Liquid and gas diffuse into and out of the chambers through the siphuncle and thereby allows for buoyancy adjustments [9, 10]
  • Siphuncle - Reference. org
    The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusc Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and Spirula
  • The Siphuncle – 114 Chambers
    There are small structures called septal necks or siphuncle notches made of aragonite (unlike the tube) that supported the siphuncle itself, and remain preserved on nautilus shells whereas the tube does not
  • siphuncle - definition and meaning - Wordnik
    siphuncle: A tubelike structure in the body of a shelled cephalopod, such as a nautilus, extending through each chamber of the shell





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