Biomaterial Database

Fine structure of the sensory receptors of Aglantha digitale (Hydromedusae: Trachylina). 1983

C L Singla

Fine-structure studies of the sensory receptors of Aglantha digitale have been done by transmission- and scanning-electron microscopy. Aglantha has 8 club-shaped statocysts and three types of ciliated sensory receptors: ciliated comb pads, ciliated sensory cells with microvilli, and ciliated sensory cells without microvilli. The epithelium covering the statocyst has both ciliated sensory cells and epitheliomuscular cells. The ciliated comb pads are formed by a group of ciliated sensory cells, each having an apical kinocilium surrounded by a ring of microvilli. These microvilli show an increase in length towards the velum. The axons from the comb pad cells enter the inner nerve ring. The structure, function and the evolution of the statocysts and the possible role of the ciliated comb pads and other sensory receptors are discussed.

UI	MeSH Term	Description	Entries
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D008871	Microvilli	Minute projections of cell membranes which greatly increase the surface area of the cell.	Brush Border,Striated Border,Border, Brush,Border, Striated,Borders, Brush,Borders, Striated,Brush Borders,Microvillus,Striated Borders
D011984	Sensory Receptor Cells	Specialized afferent neurons capable of transducing sensory stimuli into NERVE IMPULSES to be transmitted to the CENTRAL NERVOUS SYSTEM. Sometimes sensory receptors for external stimuli are called exteroceptors; for internal stimuli are called interoceptors and proprioceptors.	Nerve Endings, Sensory,Neurons, Sensory,Neuroreceptors,Receptors, Neural,Neural Receptors,Receptors, Sensory,Sensory Neurons,Sensory Receptors,Nerve Ending, Sensory,Neural Receptor,Neuron, Sensory,Neuroreceptor,Receptor Cell, Sensory,Receptor Cells, Sensory,Receptor, Neural,Receptor, Sensory,Sensory Nerve Ending,Sensory Nerve Endings,Sensory Neuron,Sensory Receptor,Sensory Receptor Cell
D002923	Cilia	Populations of thin, motile processes found covering the surface of ciliates (CILIOPHORA) or the free surface of the cells making up ciliated EPITHELIUM. Each cilium arises from a basic granule in the superficial layer of CYTOPLASM. The movement of cilia propels ciliates through the liquid in which they live. The movement of cilia on a ciliated epithelium serves to propel a surface layer of mucus or fluid. (King & Stansfield, A Dictionary of Genetics, 4th ed)	Motile Cilia,Motile Cilium,Nodal Cilia,Nodal Cilium,Primary Cilia,Primary Cilium,Cilium,Cilia, Motile,Cilia, Nodal,Cilia, Primary,Cilium, Motile,Cilium, Nodal,Cilium, Primary
D003063	Cnidaria	A phylum of radially symmetrical invertebrates characterized by possession of stinging cells called nematocysts. It includes the classes ANTHOZOA; CUBOZOA; HYDROZOA, and SCYPHOZOA. Members carry CNIDARIAN VENOMS.	Cnidarians,Cnidarian,Cnidarias
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D037401	Scyphozoa	The class of true jellyfish, in the phylum CNIDARIA. They are mostly free-swimming marine organisms that go through five stages in their life cycle and exhibit two body forms: polyp and medusa.	Aurelia aurita,Chrysaora fuscescens,Jellyfish, Moon,Jellyfish, True,Moon Jellyfish,Sea Nettle, West Coast,Moon Jelly,Sea Nettle, Pacific,Aurelia auritas,Chrysaora fuscescen,Jellies, Moon,Jelly, Moon,Jellyfishs, Moon,Jellyfishs, True,Moon Jellies,Moon Jellyfishs,Nettle, Pacific Sea,Nettles, Pacific Sea,Pacific Sea Nettle,Pacific Sea Nettles,Scyphozoas,Sea Nettles, Pacific,True Jellyfish,True Jellyfishs,auritas, Aurelia,fuscescens, Chrysaora