air sac


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Related to air sac: bronchiole

al·ve·o·lar sac

1. terminal dilation of the alveolar ducts, which 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; Synonym(s): sacculus alveolaris [TA]
2. in birds, air-containing extensions of bronchi that connect with bone cavities.
Synonym(s): air sac

air sac

n.
1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.
2. See alveolus.
3. A saclike, thin-walled enlargement in the trachea of an insect.
4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes.

air sac

a small, terminal cavity in the lung, consisting of the alveoli connected to one terminal bronchiole.
Air sacclick for a larger image
Fig. 18 Air sac . The air-sac system of a bird (left-side).

air sac

a thin-walled extension to the lungs, present in the thorax, abdomen and bones of birds. Air sacs also occur as diverticula (outgrowths) of the TRACHEA in insects, where, as in birds, they are important in respiration.

sac

a pouch; a baglike organ or structure. See also conjunctival sac.

air sac
1. alveolar sac.
2. one of the large air-filled diverticula of the respiratory system of birds. See also air sacs.
allantoic sac
alveolar s's
the spaces into which the alveolar ducts open distally, and with which the alveoli communicate.
anal sac
endolymphatic sac
the blind, flattened cerebral end of the endolymphatic duct.
heart sac
the pericardium.
hernial sac
the peritoneal pouch that encloses a herniated viscus or mesentery.
lacrimal sac
see lacrimal sac.
paranal sac
pleural sac
the pleura-lined cavity which contains the lung.
ruminal sac
one of the dorsal and ventral sacs of the rumen which are themselves further subdivided to create a caudodorsal sac and a caudoventral sac.
yolk sac
the extraembryonic membrane connected with the midgut; in vertebrates other than true mammals, it contains a yolk mass. See also yolk sac.
References in periodicals archive ?
Although white plaques were observed within the air sacs, typical for Aspergillus species infection, histopathologic examination revealed no fungal involvement with the tracheal lesion.
At necropsy, there was numerous granulomatous foci in the air sacs, lungs and liver.
The scanner should be applied with slight pressure to compress the underlying air sacs.
The air sac walls are diffusely thickened, irregular, grey, and opaque and show multifocal, approximately 2-mm-diameter granulomas (arrowhead).
Some of the models contained an air sac, the Daily Mail reported.
Endosurgical debridement and diode laser ablation of lung and air sac granulomas in psittaeine birds.
The lung-on-a-chip microdevice takes a new approach to tissue engineering by placing two layers of living tissues-the lining of the lung's air sacs and the blood vessels that surround them-across a porous, flexible boundary.
During anesthetic recovery, the duck became severely dyspneic after tracheal extubation despite ventilation with oxygen at 3L/ min via the air sac cannula.
At postmortem examination, a massive dark red and green blood clot was identified extending from the left lung to the left posterior thoracic air sac and left abdominal air sac.
Extensive infiltration of neoplastic cells was observed in the lung parenchyma, syringeal muscle and submucosa, clavicular air sac interstitium, parenchyma of the kidneys and spleen, and adventitia and lamina propria of the esophagus, proventriculus, isthmus, ventriculus, and duodenum (Fig 4B through D).
The cause of death was attributed to air sac trematodes, which were identified as Szidatitrema species based on morphology of adult trematodes and miracidia isolated from a snail intermediate host.
Necropsy and histologic investigation identified reduction in the diameter of the vertebral canal and spinal cord at cervical segments 8-9 with coalescing granulomas and intralesional acid-fast bacilli within the intertrabecular space, left side of the clavicular air sac, and cranial left lung.