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Ultrastructure of Mehlis' gland in the lung fluke, Paragonimus ohirai (Trematoda: Troglotrematidae)
- Source :
- Journal of morphology. 207(1)
- Publication Year :
- 1991
-
Abstract
- Mehlis' gland of a digenetic trematode, Paragonimus ohirai, is composed of two types of secretory cells, DB and CB. The less abundant type (DB) produces dense bodies, with the cytoplasm characterized by greatly distended cisternae of rough endoplasmic reticulum. The other type (CB) synthesizes clear, vesicular bodies. Its cytoplasm contains numerous mitochondria, rough endoplasmic reticulum with narrow cisternae, and abundant Golgi complexes. Processes of the two cell types converge on the ootype-proximal uterine wall, pass through the epithelium, and finally open into the lumen. These proximal processes contain longitudinally arranged microtubules whose luminal ends are anchored to the epithelium by ring-form septate desmosomes. According to the distribution of the two types of processes, three different zones (DB, mixed, and CB) can be recognized within the epithelia. As the CB processes enter the lumen predominantly beyond the uterine valve region, this cell may produce secretions required for egg shell maturation or hardening. The role of DB cells (which enter the lumen more commonly in the ootype near the oviduct) remains unknown.
- Subjects :
- Cytoplasm
Endoplasmic reticulum
Paragonimus
Lumen (anatomy)
Anatomy
Genitalia, Female
Biology
Golgi apparatus
Epithelium
Mehlis gland
symbols.namesake
Microscopy, Electron
medicine.anatomical_structure
Microtubule
Ultrastructure
medicine
symbols
Animals
Animal Science and Zoology
Female
Developmental Biology
Subjects
Details
- ISSN :
- 03622525
- Volume :
- 207
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Journal of morphology
- Accession number :
- edsair.doi.dedup.....a6d11859c70139e99a73f640719a85c0