1. A pouch or bursa. SYN: saccus [TA]. SEE ALSO: sacculus. 2. An encysted abscess at the root of a tooth. 3. The capsule of a tumor, or envelope of a cyst. [L. saccus, a bag]
- abdominal s. the part of the embryonic celom that becomes the abdominal cavity.
- air s. SYN: alveolar s..
- allantoic s. the dilated distal portion of the allantois; it forms part of the placenta in many mammals.
- alveolar s. 1. terminal dilation of the alveolar ducts that give rise to alveoli in the lung; a small air chamber in the pulmonary tissue from which the pulmonary alveoli project like bays and into which an alveolar duct opens; SYN: sacculus alveolaris [TA]. 2. in birds, air-containing extensions of bronchi that connect with bone cavities. SYN: air s..
- amnionic s. SYN: amnion.
- aneurysmal s. the dilated wall of an artery in a saccular aneurysm.
- aortic s. in mammalian embryos, the endothelially lined dilation just distal to the truncus arteriosus; it is the primordial vascular channel from which the aortic arch/arteries arise and is homologous to the ventral aorta of gill-bearing vertebrates.
- chorionic s. SYN: chorion.
- conjunctival s. [TA] the space bound by the conjunctival membrane between the palpebral and bulbar conjunctiva, into which the lacrimal fluid is secreted; it is a closed space when eye is closed; when eye is open, the s. is open anteriorly via the palpebral fissure (between the eyelids). SYN: saccus conjunctivalis [TA].
- cupular blind s. SYN: cupular cecum of the cochlear duct.
- dental s. the outer investment of mesenchymal tissue surrounding a developing tooth; involved in formation of the root and periodental ligament. SEE ALSO: dental follicle.
- endolymphatic s. [TA] the dilated blind extremity of the endolymphatic duct, which lies external to the dura on the posterior aspect of the petrous part of the temporal bone. SYN: saccus endolymphaticus [TA], Böttcher space, Cotunnius space, sacculus endolymphaticus.
- gestational s. cystic structure of early pregnancy that represents the amnionic s., fluid, and placenta.
- heart s. SYN: pericardium.
- hernial s. the protruding envelope of peritoneum in a hernia.
- Hilton s. SYN: laryngeal saccule.
- lacrimal s. [TA] the dilated upper portion of the nasolacrimal duct into which the two lacrimal canaliculi empty. SYN: saccus lacrimalis [TA], dacryocyst, sacculus lacrimalis, tear s..
- lesser peritoneal s. SYN: omental bursa.
- lymph sacs the earliest lymphatic vessels formed in the embryo.
- nasal sacs the deepened nasal pits that develop into the definitive nasal cavities.
- omental s. SYN: omental bursa.
- preputial s. the space between the prepuce and the glans penis.
- pudendal s. a pear-shaped encapsulated collection of connective tissue and fat in each labium majus. SYN: Broca pouch.
- tear s. SYN: lacrimal s..
- tooth s. a capsule that encloses the developing tooth.
- vestibular blind s. SYN: vestibular cecum of the cochlear duct.
- vitelline s. SYN: yolk s..
- yolk s. 1. in vertebrates with telolecithal eggs; the highly vascular layer of splanchnopleure surrounding the yolk of an embryo; 2. in humans and other mammals, the s. of extraembryonic membrane that is located ventral to the embryonic disk and, after formation of the gut tube, is connected to the midgut; by the second month of development, this connection has become the narrow yolk stalk; the yolk s. is the first hematopoietic organ of the embryo, and its vitelline circulation plays an important role in the early embryonic circulation; the s. is also the site of origin of the primordial germ cells. SYN: umbilical vesicle, vesicula umbilicalis, vitelline s..
* * *
saccharin; sacrum; screening and acute care; seasonal acute conjunctivitis; Self-Assessment of Communication [scale]; serum aminoglycoside concentration; short-arm cast; sideline assessment of concussion; small accessory chromosome; social activity [scale]; splinting for acute closure; stable access cannula; stretch- activated channel [heart contraction]; subarea advisory council; substance abuse counselor; symptomatic anomaly complex

* * *

sac 'sak n a soft-walled anatomical cavity usu. having a narrow opening or none at all and often containing a special fluid <a synovial \sac> see AIR SAC, amniotic sac, DENTAL SAC, LACRIMAL SAC

* * *

a pouch or baglike structure. Sacs can enclose natural cavities in the body, e.g. in the lungs (see alveolus) or in the lacrimal apparatus of the eye, or they can be pathological, as in a hernia.

* * *

(sak) [L. saccus; Gr. sakkos] a pouch or bag.

Medical dictionary. 2011.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • sac — sac …   Dictionnaire des rimes

  • sac — 1. (sak ; au XVIe s. le pluriel se prononçait saz, c est à dire sâ, PALSGRAVE, p. 25) s. m. 1°   Espèce de poche en toile, en cuir ou étoffe, ouverte par le haut et cousue par le bas et par les côtés. Un sac de crin. à la gueule du sac. L entrée …   Dictionnaire de la Langue Française d'Émile Littré

  • sac — SAC, saci, s.m. 1. Obiect confecţionat din pânză, din hârtie rezistentă, din material plastic etc., folosit la păstrarea şi la transportarea unor produse; conţinutul unui astfel de obiect; obiectul împreună cu conţinutul lui. ♢ Sac de dormit =… …   Dicționar Român

  • SAC — or sac may refer to:Biology* Sac (biology), a bag like structure possibly containing fluid, in a plant, animal, or fungus.United States geography* Sac City, Iowa * Sac County, Iowa * Sac River, a river in southwest Missouri * Sacramento,… …   Wikipedia

  • sac — Sac, m. Est une poche, ronde ou quarrée, de quelque estoffe qu elle soit creuse, duicte à empocher bled ou autres choses. Saccus. L Hebrieu dit Sac, le Grec {{t=g}}sakkos,{{/t}} dont le Latin et le François peuvent estre tirez. Il se prononce… …   Thresor de la langue françoyse

  • SAC — Saltar a navegación, búsqueda Las siglas SAC pueden significar: SAC Sveriges Arbetares Centralorganisation, un conocido sindicato sueco, de orientación anarcosindicalista. SAC Satélites de Argentina, organización estatal de Argentina, dedicada al …   Wikipedia Español

  • Sac d'os — Auteur Stephen King Genre Roman Version originale Titre original Bag of Bones Éditeur original Scribner Langue originale Anglai …   Wikipédia en Français

  • SAC-D — Typ: Erdbeobachtungssatellit Land: Argentinien …   Deutsch Wikipedia

  • Sac — steht für: Schweizer Alpen Club Scientific Amortized Cost, eine Klassifizierung des Amortisierungsverfahrens Single Attached Concentrator, siehe Fiber Distributed Data Interface Societas Apostolatus Catholici, siehe Pallottiner, eine religiöse… …   Deutsch Wikipedia

  • SAC-B — Saltar a navegación, búsqueda SAC B Organización CONAE Estado Fallido Fecha de lanzamiento 1996 Aplicación Observatorio espacial …   Wikipedia Español

  • SAC — (фр. Service d Action Civique  рус. Служба гражданского действия)  голлистская милитаристская организация, созданная в январе 1960 г. Жаком Фоккаром, главным советником Шарля де Голля по вопросам политики в отношении… …   Википедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”