Abstract
Microscopic studies have shown the saccopleural membrane in the respiratory system of the domestic fowl to consist of a sheet of three dense layers of collagen fibres covered dorsally and ventrally by mainly simple squamous epithelium. On the ventral surface, which faces into the caudal thoracic air sac, there are occasional ridges of pseudostratified ciliated epithelium. Many nerve bundles are present throughout the membrane, the larger bundles of myelinated and unmyelinated axons being confined to the lamina propria under the dorsal epithelium (parietal pleura). In addition to axonal profiles with the ultrastructural appearance of cholinergic or adrenergic axons, peptidergic-type axons were identified. Immunofluorescence studies demonstrated VIP-, substance P-, somatostatin- and enkephalin-immunoreactive fibres in the membrane. Although it has been suggested that receptors may be present in this region of the respiratory system, none of the axons have features suggestive of sensory terminals, although many axonal profiles are closely associated with the epithelia where no obvious effector cells are present.
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- Bennett T., Malmfors T. The adrenergic nervous system of the domestic fowl (Gallus domesticus [L.]). Z Zellforsch Mikrosk Anat. 1970;106(1):22–50. doi: 10.1007/BF01027715. [DOI] [PubMed] [Google Scholar]
- COONS A. H. Fluorescent antibody methods. Gen Cytochem Methods. 1958;1:399–422. [PubMed] [Google Scholar]
- Carlson H. C., Beggs E. C. Ultrastructure of the abdominal air sac of the fowl. Res Vet Sci. 1973 Mar;14(2):148–150. [PubMed] [Google Scholar]
- Cook R. D., Vaillant C. R., King A. S. The abdominal air sac ostium of the domestic fowl: a sphincter regulated by neuro-epithelial cells? J Anat. 1986 Dec;149:101–111. [PMC free article] [PubMed] [Google Scholar]
- Duncker H. R. The lung air sac system of birds. A contribution to the functional anatomy of the respiratory apparatus. Ergeb Anat Entwicklungsgesch. 1971;45(6):7–171. [PubMed] [Google Scholar]
- Groth H. P. Licht- und fluoreszenzmikroskopische Untersuchungen zur Innervation des Luftsacksystems der Vögel. Z Zellforsch Mikrosk Anat. 1972;127(1):87–115. [PubMed] [Google Scholar]
- Johansson O., Lundberg J. M. Ultrastructural localization of VIP-like immunoreactivity in large dense-core vesicles of 'cholinergic-type' nerve terminals in cat exocrine glands. Neuroscience. 1981;6(5):847–862. doi: 10.1016/0306-4522(81)90167-6. [DOI] [PubMed] [Google Scholar]
- King A. S., McLelland J., Cook R. D., King D. Z., Walsh C. The ultrastructure of afferent nerve endings in the avian lung. Respir Physiol. 1974 Oct;22(1-2):21–40. doi: 10.1016/0034-5687(74)90045-0. [DOI] [PubMed] [Google Scholar]
- Lucas A. M. Avian functional anatomic problems. Fed Proc. 1970 Sep-Oct;29(5):1641–1648. [PubMed] [Google Scholar]
- Molony V. Classification of vagal afferents firing in phase with breathing in Gallus domesticus. Respir Physiol. 1974 Oct;22(1-2):57–76. doi: 10.1016/0034-5687(74)90047-4. [DOI] [PubMed] [Google Scholar]
- Pickel V. M., Joh T. H., Reis D. J., Leeman S. E., Miller R. J. Electron microscopic localization of substance P and enkephalin in axon terminals related to dendrites of catecholaminergic neurons. Brain Res. 1979 Jan 19;160(3):387–400. doi: 10.1016/0006-8993(79)91068-0. [DOI] [PubMed] [Google Scholar]
- Walsh C., McLelland J. The ultrastructure of the avian extrapulmonary respiratory epithelium. Acta Anat (Basel) 1974;89(3):412–422. doi: 10.1159/000144302. [DOI] [PubMed] [Google Scholar]