Ultrastructure of the tubular accessory gland in Haemaphysalis longicornis (Acari: Ixodidae).

Research paper by Hiroyuki H Kakuda, Takashi T Koga, Takayuki T Mori, Satoshi S Shiraishi

Indexed on: 01 Jul '94Published on: 01 Jul '94Published in: Journal of Morphology


The paired tubular accessory glands in Haemaphysalis longicornis open at the junction of the cervical and the vestibular parts of vagina via short and narrow ducts. The pseudostratified columnar glandular epithelium covered by the muscle layer consists of both secretory and supporting cells. As feeding proceeds, the secretory cells increase in volume. In ovipositing females, well-developed rough endoplasmic reticulum, the Golgi complex, and membranebound granules that are undergoing exocytosis suggest that the secretory cells are involved in protein synthesis. However, in virgin females that fed 10 days, only small dense granules and no secretion activity were observed. The secretions from the tubular accessory gland may be released into the genital tract during the egg passage through the vagina. However, the supporting cells located between the secretory cells become slender during feeding, cohere to each other at the luminal side, and have a very narrow attachment at the basement membrane. Supporting cells probably help maintain secretory cell shape especially during granular discharge into the lumen. © 1994 Wiley-Liss, Inc. Copyright © 1994 Wiley-Liss, Inc.