sinus, pl. sinussinuses (sI´nus, -ez)

1. [NA] 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. [na] A cavity or hollow space in bone or other tissue. 3. [NA] A dilatation in a blood vessel. 4. A fistula or tract leading to a suppurating cavity. [L. sinus, cavity, channel, hollow]
s. a´lae par´vaesphenoparietal s
anal sinuses 1. the grooves between the anal columns;Morgagni's s. (1) ; 2. pockets or crypts in the columnar zone of the anal canal between the anocutaneous line and the anorectal line; the sinuses give the mucosa a scalloped appearance.s. anales [NA] , anal crypts, Morgagni's crypts, rectal sinuses;
s. ana´les [NA] anal sinuses
anterior sinusesanterior ethmoidal air cells, under cell
s. aor´tae [NA] aortic s
aortic s.the space between the superior aspect of each cusp of the aortic valve and the dilated portion of the wall of the ascending aorta, immediately above each cusp.s. aortae [NA] , Petit's s., Valsalva's s;
Arlt's inconstant depression on the lower portion of the internal surface of the lacrimal sac.
barber's pilonidal s.pilonidal s. occurring in barbers, usually in the web between the fingers, due to the burying of exogenous hairs by the alternate loosening and tightening of tissues of the hand by the manipulation of scissors.
basilar s.basilar plexus
Breschet's s.sphenoparietal s
s. carot´icus [NA] carotid s
carotid s.a slight dilation of the common carotid artery at its bifurcation into external and internal carotids; it contains baroreceptors which, when stimulated, cause slowing of the heart, vasodilation, and a fall in blood pressure and is innervated primarily by the glossopharyngeal nerve.s. caroticus [NA] , carotid bulb;
s. caverno´sus [NA] cavernous s
cavernous s.a paired dural venous s. on either side of the sella turcica, the two being connected by anastomoses, the anterior and posterior intercavernous s., in front of and behind the hypophysis, respectively, making thus the circular s.; the cavernous s. is unique among dural venous sinuses in being trabeculated; coursing within the sinus are the internal carotid artery and the abducent nerve.s. cavernosus [NA] ;
cerebral sinusesdural venous sinuses
cervical young mammalian embryos a depression in the nuchal region caudal to the hyoid arch, with the third and fourth branchial arches and ectodermal grooves in its floor; normally it is obliterated after the second month, but occasionally cervical fistulae persist as vestiges of it.precervical s;
circular s. 1. dural venous formation which surrounds the hypophysis, composed of right and left cavernous sinuses and the intercavernous sinuses;circulus venosus ridleyi, Ridley's circle; 2. a venous s. at the periphery of the placenta; 3. s. venosus sclerae
s. circula´riss. venosus sclerae
coccygeal s.a fistula opening in the region of the coccyx, being the result of incomplete closure of the caudal end of the neurenteric canal. See also pilonidal s.
s. corona´rius [NA] coronary s
coronary s.a short trunk receiving most of the cardiac veins, beginning at the junction of the great cardiac vein and the oblique vein of the left atrium, running in the posterior part of the coronary sulcus and emptying into the right atrium between the inferior vena cava and the atrioventricular orifice.s. coronarius [NA] ;
costomediastinal s.costomediastinal recess
cranial sinusesdural venous sinuses
dermal s.a s. lined with epidermis and skin appendages extending from the skin to some deeper-lying structure, most frequently the spinal cord.
s. du´rae ma´tris [NA] dural venous sinuses
dural venous sinusesendothelium-lined venous channels in the dura mater.s. durae matris [NA] , cerebral sinuses, cranial sinuses, sinuses of dura mater, venous sinuses;
sinuses of dura materdural venous sinuses
Englisch's s.inferior petrosal s
s. epididym´idis [NA] s. of epididymis
s. of epididymisa narrow space between the body of the epididymis and the testis.s. epididymidis [NA] ;
ethmoidal sinusesethmoidal air-cells; evaginations of the mucous membrane of the middle and superior meatuses of the nasal cavity into the ethmoidal labyrinth forming multiple small paranasal sinuses; they are subdivided into anterior, middle and posterior ethmoidal sinuses.antra ethmoidalia;
s. ethmoida´les [NA] ethmoid air cells, under cell
s. ethmoidales anterio´res [NA] anterior ethmoidal air cells, under cell
s. ethmoidales me´diae [NA] middle ethmoidal air cells, under cell
s. ethmoidales posterio´res [NA] posterior ethmoidal air cells, under cell
frontal s.a hollow paranasal sinus formed on either side in the lower part of the squama of the frontal bone; it communicates by the ethmoidal infundibulum with the middle meatus of the nasal cavity of the same side.s. frontalis [NA] ;
s. fronta´lis [NA] frontal s
Guérin's s.a cul-de-sac or diverticulum behind the valve of the navicular fossa.
Huguier's s.fossula fenestrae vestibuli
inferior longitudinal s.inferior sagittal s
inferior petrosal s.a paired dural venous s. running in the groove on the petrooccipital fissure connecting the cavernous s. with the superior bulb of the internal jugular vein.s. petrosus inferior [NA] , Englisch's s;
inferior sagittal unpaired dural venous s. in the lower margin of the falx cerebri, running parallel to the superior sagittal s. and merging with the great cerebral vein to form the the straight s.s. sagittalis inferior [NA] , inferior longitudinal s;
s. intercaverno´si [NA] intercavernous sinuses
intercavernous sinusesthe anterior and posterior anastomoses between the cavernous s.'s, passing anterior and posterior to the hypophysis and forming, with the cavernous sinuses, the circular s. (1) .s. intercavernosi [NA] , Ridley's s;
jugular s., s. jugula´risone of three enlargements of the jugular veins; the external jugular s. is between the two sets of valves; the internal jugular s.'s are at the origin (superior bulb) and near the termination (inferior bulb).
s. lactif´eri [NA] lactiferous s
lactiferous s.a circumscribed spindle-shaped dilation of the lactiferous duct just before it enters the nipple. In nursing mothers this dilatation stores a droplet of milk which is expressed by compression as the infant begins to suckle; this is thought to encourage continual suckling while the let-down reflex ensues.s. lactiferi [NA] , ampulla lactifera, ampulla of milk duct, lactiferous ampulla;
laryngeal s.laryngeal ventricle
s. laryn´geuslaryngeal ventricle
lateral s.transverse s
s. lie´nis [NA] splenic s
longitudinal s. See inferior sagittal s., superior sagittal s.
longitudinal vertebral venous s.large, plexiform veins forming portions of the anterior internal vertebral venous plexus lying on the posterior surfaces of the vertebral bodies on either side of the posterior longitudinal ligament.s. vertebrales longitudinales;
Luschka's s.venous s. in the petrosquamous suture.
lymph s.lymphatic s
lymphatic s.the channels in a lymph node crossed by a reticulum of cells and fibers and bounded by littoral cells; there are subcapsular, trabecular, and medullary s.'s.lymph s;
Maier's infundibuliform depression on the internal surface of the lacrimal sac which receives the lacrimal canaliculi.
marginal sinuses of placentadiscontinuous venous lakes at the margin of the placenta.
mastoid sinusesmastoid air cells, under cell
s. maxilla´ris [NA] maxillary s
maxillary s.the largest of the paranasal sinuses occupying the body of the maxilla, communicating with the middle meatus of the nose.s. maxillaris [NA] , antrum of Highmore, genyantrum, maxillary antrum;
Meyer's s.a small concavity in the floor of the external auditory canal near the membrana tympani.
middle ethmoidal sinusesmiddle ethmoidal air cells, under cell
Morgagni's s. 1. anal sinuses (1) 2. prostatic utricle 3. laryngeal ventricle
s. of nails. unguis
oblique pericardial s.the recess in the pericardial cavity posterior to the base of the heart bounded laterally by the pericardial reflections on the pulmonary veins and inferior vena cava, and posteriorly by the pericardium overlying the anterior aspect of the esophagus.s. obliquus pericardii [NA] , oblique s. of pericardium;
oblique s. of pericardiumoblique pericardial s
s. obli´quus pericar´dii [NA] oblique pericardial s
occipital unpaired dural venous s. commencing at the confluence of the sinuses and passing downward in the base of the falx cerebelli to the foramen magnum.s. occipitalis [NA] ;
s. occipita´lis [NA] occipital s
Palfyn's s.a space within the crista galli of the ethmoid described as communicating with the ethmoidal and frontal s.'s.
paranasal sinusesthe paired air-filled cavities in the bones of the face lined by mucous membrane continuous with that of the nasal cavity; these s.'s are the frontal, sphenoidal, maxillary, and ethmoidal.s. paranasales [NA] ;
s. paranasa´les [NA] paranasal sinuses
parasinoidal sinuseslateral venous lacunae, under lacuna
Petit's s.aortic s
petrosal s. See inferior petrosal s., superior petrosal s.
s. petro´sus infe´rior [NA] inferior petrosal s
s. petro´sus supe´rior [NA] superior petrosal s
phrenicocostal s.costodiaphragmatic recess
pilonidal s.a fistula or pit in the sacral region, communicating with the exterior, containing hair which may act as a foreign body producing chronic inflammation.pilonidal fistula;
piriform s.piriform fossa
pleural sinusespleural recesses, under recess
s. pocula´risprostatic utricle
s. poste´rior [NA] a deep groove above the pyramidal eminence extending to the incudal fossa in the posterior wall of the tympanic cavity.
precervical s.cervical s
prostatic s.the groove on either side of the urethral crest in the prostatic part of the urethra into which the prostatic ducts open.s. prostaticus [NA] ;
s. prostat´icus [NA] prostatic s
pulmonary sinusesthe space at the origin of the pulmonary trunk between the dilated wall of the vessel and each cusp of the pulmonic valve.s. trunci pulmonalis [NA] ;
rectal sinusesanal sinuses
s. rec´tus [NA] straight s
renal s.the cavity of the kidney, containing the calyces and pelvis of the ureter and the segmental vesels embedded within a fatty matrix. The renal sinuses cause the kidneys to appear hollow or C-shaped on cross section or medical imaging.s. renalis [NA] ;
s. rena´lis [NA] renal s
s. reu´niensobsolete term for s. venosus.
rhomboidal s., s. rhomboidalisa dilation of the central canal of the spinal cord in the lumbar region.rhombocele;
Ridley's s.intercavernous sinuses
Rokitansky-Aschoff sinusessmall outpocketings of the mucosa of the gallbladder which extend through the muscular layer; they may be congenital.
s. sagitta´lis infe´rior [NA] inferior sagittal s
s. sagitta´lis supe´rior [NA] superior sagittal s
sigmoid s.the S-shaped dural venous s. lying deep to the mastoid process of the temporal bone and immediately posterior to the petrous temporal bone; it is continuous with the transverse s. and empties into the internal jugular vein as it passes through the jugular foramen.s. sigmoideus [NA] ;
s. sigmoi´deus [NA] sigmoid s
sphenoidal of a pair of paranasal sinuses in the body of the sphenoid bone communicating with the upper posterior nasal cavity or spenoethmoidal recess.s. sphenoidalis [NA] ;
s. sphenoida´lis [NA] sphenoidal s
sphenoparietal s.a paired dural venous s. beginning on the parietal bone, running along the sphenoidal ridges and emptying into the cavernous s.s. sphenoparietalis [NA] , Breschet's s., s. alae parvae;
s. sphenoparieta´lis [NA] sphenoparietal s
splenic elongated venous channel, 12 to 40 mum wide, lined by rod-shaped cells.s. lienis [NA] ;
straight unpaired dural venous s. in the posterior part of the falx cerebri where it is attached to the tentorium cerebelli; it is formed anteriorly by the merging of the great cerebral vein with the inferior sagittal sinus, and passes horizontally and posteriorly to the confluence of sinuses.s. rectus [NA] , tentorial s;
superior longitudinal s.superior sagittal s
superior petrosal s.a paired dural venous s. in the groove along the crest of the petrous temporal bone, connecting the cavernous s. with the termination of the transverse s. or beginning of the sigmoid sinus.s. petrosus superior [NA] ;
superior sagittal unpaired dural venous s. in the sagittal groove, beginning at the foramen caecum and terminating at the confluence of sinuses where it merges with the straight sinus; receives the superior cerebral veins and has lateral extensions, the lateral venous lacunae.s. sagittalis superior [NA] , superior longitudinal s;
tarsal s.a hollow or canal formed by the groove of the talus and the interosseous groove of the calcaneus which is occupied by the interosseous talocalcaneal ligament.s. tarsi [NA] , tarsal canal;
s. tar´si [NA] tarsal s
tentorial s.straight s
terminal s., s. termina´listhe vein bounding the area vasculosa in the blastoderm.
s. tonsilla´ristonsillar fossa
Tourtual's s.supratonsillar fossa
transverse s.a paired dural venous s. that drains the confluence of sinuses, running along the occipital attachment of the tentorium cerebelli and terminating in the sigmoid s.s. transversus [NA] , lateral s;
transverse pericardial s.a passage in the pericardial sac between the origins of the great vessels, i.e., posterior to the intrapericardial portions of the pulmonary trunk and ascending aorta and anterior to the superior vena cava and superior to the atria; it is formed as a result of the flexure of the heart tube, partially approximating the great venous and arterial vessels.s. transversus pericardii [NA] , Theile's canal, transverse s. of pericardium;
transverse s. of pericardiumtransverse pericardial s
s. transver´sus [NA] transverse s
s. transver´sus pericar´dii [NA] transverse pericardial s
s. trun´ci pulmona´lis [NA] pulmonary sinuses
s. tym´pani [NA] tympanic s
tympanic s.a depression in the tympanic cavity posterior to the tympanic promontory.s. tympani [NA] ;
s. un´guisthe deep cleft housing the root of the nail.s. of nail;
urogenital s. 1. the ventral part of the cloaca after its separation from the rectum by the growth of the urorectal septum; from it develops the lower part of the bladder in both sexes, the prostatic portion of the male urethra, and the urethra and vestibule in the female; 2. persistent cloaca
s. urogenita´lispersistent cloaca
uterine s.a small irregular vascular channel in the endometrium, of a type that forms during pregnancy.uterine sinusoid;
uteroplacental sinusesirregular vascular spaces in the zone of the chorionic attachment to the decidua basalis.
Valsalva's s.aortic s
s. of the vena cavathe portion of the cavity of the right atrium of the heart that receives the blood from the venae cavae; it is separated from the rest of the atrium by the crista terminalis.s. venarum cavarum [NA] ;
s. vena´rum cava´rum [NA] s. of the vena cava
s. veno´sus [NA] a cavity at the caudal end of the embryonic cardiac tube in which the veins from the intra- and extraembryonic circulatory arcs unite; in the course of development it forms the portion of the right atrium known in adult anatomy as the sinus of the vena cava.saccus reuniens;
s. veno´sus scle´rae [NA] the vascular structure encircling the anterior chamber of the eye and through which the aqueous is returned to the blood circulation.circular s. (3) , Fontana's canal, Lauth's canal, Schlemm's canal, s. circularis, venous s. of sclera;
venous sinusesdural venous sinuses
venous s. of scleras. venosus sclerae
s. vertebra´les longitudina´leslongitudinal vertebral venous s


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