sac (sak) a pouch or bag.
gestational sac,
air sacs alveolar s's.
allantoic sac the dilated portion of the allantois, becoming a part of the placenta in many mammals; it becomes the urachus in humans.
alveolar sacs the spaces into which the alveolar ducts open distally, and with which the alveoli communicate. 
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Alveolar sacs (sacculi alveolares).
amniotic sac that formed by the amnion, containing the amniotic fluid.
chorionic sac that formed by the vertebrate chorion, surrounding the embryo, amniotic cavity, and amniotic sac and contributing to the fetal part of the placenta.
conjunctival sac the potential space, lined by conjunctiva, between the eyelids and eyeball.
dental sac the dense fibrous layer of mesenchyme surrounding the enamel organ and dental papilla.
endolymphatic sac the blind, flattened cerebral end of the endolymphatic duct.
gestational sac that comprising the extraembryonic membranes that envelop the embryo or fetus; in humans, that formed by the fused amnion and chorion.
heart sac pericardium.
hernial sac the peritoneal pouch enclosing a hernia.
Hilton's sac laryngeal saccule.
lacrimal sac the dilated upper end of the nasolacrimal duct.
yolk sac the extraembryonic membrane that connects with the midgut; at the end of the fourth week of development it expands into a pear-shaped vesicle (umbilical vesicle) connected to the body of the embryo by a long narrow tube (yolk stalk) . In mammals, it produces a complete vitelline circulation in the early embryo and then undergoes regression.
gestational sac,
a pouch containing the fetus in extrauterine gestation.
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