sac (sak) a pouch or bag.
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.
air sacs
sacs that communicate with the respiratory, air-filled membranous system in birds and primates.
avian air sacs
there are eight air sacs in the chicken: an unpaired cervical, an unpaired clavicular, a pair of cranial thoracic, a pair of caudal thoracic and a pair of abdominal sacs. They connect with the lungs through ostia along the ventrolateral borders of the lungs. The connections are to large and small bronchi. The sacs are also connected to and aerate the bones of the thoracic cage, including the vertebrae, the pelvis and the upper limb bones. Ducks have a similar pattern of air sacs to that of chickens. Turkeys have seven sacs: an unpaired cervicoclavicular sac, a pair of medial clavicular, a pair of cranial thoracic and a pair of abdominal sacs.
air sacs disease
includes airsacculitis and air sac mite infestation (cytoditesnudus).
air sacs inflammation
see airsacculitis.
air sacs mite
cytoditesnudus.
primate air sacs
laryngeal diverticula of variable size that reach extreme development in the gibbons.
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