blood sinus


blood sinus
(MOLLUSCA: Bivalvia)
A blood vessel which is irregular in shape without specialized walls.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • sinus terminalis — sinus ter·mi·na·lis .tər mi nā ləs n a circular blood sinus bordering the area vasculosa of the vertebrate embryo …   Medical dictionary

  • sinus — A blood filled space on the venous side of the circulatory system [Warner, 1977]. Any space or cavity in body tissues; also, refers to broad concavity in margin of shell [Butler, T.H.]. (Order Notostraca): Posterior emargination of carapace;… …   Crustacea glossary

  • Sinus — may refer to:In anatomy, where a sinus is a sac or cavity in any organ or tissue: *Sinus (anatomy), description of the general term *Anal sinuses, the furrows which separate the columns in the rectum *Paranasal sinuses, air cavities in the… …   Wikipedia

  • sinus ve|no|sus — «vih NOH suhs», 1. the chamber in the heart of lower vertebrates to which the blood is returned by the veins: »The heart [of the alligator] lies in the anteroventral part of the thorax; it comprises a small sinus venosus, two auricles, and two… …   Useful english dictionary

  • sinus of the dura mater — n any of numerous venous channels (as the sagittal sinuses, straight sinus, and transverse sinuses) that are situated between the two layers of the dura mater, that have no valves, and that drain blood from the brain and the bones forming the… …   Medical dictionary

  • sinus of Valsalva — sinus of Val·sal·va väl säl və n any one of the pouches of the aorta and pulmonary artery which are located behind the flaps of the semilunar valves and into which the blood in its regurgitation toward the heart enters and thereby closes the… …   Medical dictionary

  • sinus — [sī′nəs] n. [L, a bend, curve, fold] 1. a bend or curve 2. any cavity or hollow formed by a bending or curving 3. Anat. Zool. any of various cavities, hollows, or passages; esp., a) any of the air cavities in the skull opening into the nasal… …   English World dictionary

  • sinus — 1. [TA] A channel for the passage of blood or lymph, without the coats of an ordinary vessel; e.g., blood passages in the gravid uterus or those in the cerebral meninges. 2. [TA] A cavity or …   Medical dictionary

  • sinus — sinuslike, adj. /suy neuhs/, n., pl. sinuses. 1. a curve; bend. 2. a curving part or recess. 3. Anat. a. any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood. b. one of the hollow… …   Universalium

  • Sinus, cavernous — A large channel of venous blood creating a sinus cavity bordered by the sphenoid bone and the temporal bone of the skull. The cavernous sinus is an important structure because of its location and its contents which include the third cranial… …   Medical dictionary


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