Calyx is a term used in animal anatomy for some cuplike areas or structures.
Either a minor calyx in the kidney, a conglomeration of two or three minor calyces to form a major calyx, or the Calyx of Held, a particularly large synapse in the mammalian auditory central nervous system, named by H. Held in his 1893 article Die centrale Gehörleitung, due to its flower-petal-like shape.
In male insects, a funnel-shaped expansion of the basal part of the vas deferens (part of the seminal duct). Also in entomology, a flattened cap of neuropile in an insect brain (a component of the corpus pedunculatum) and by certain female insects, an expansion of the oviduct into which the ovarioles open.
- R.C.Brusca, G.J.Brusca. Invertebrates. Sinauer Associates, 2 ed.(2003)
- A.R.Maggenti et al., Online Dictionary of Invertebrate Zoology, digitalcommons.unl.edu, 2005
- Held, H."Die centrale Gehörleitung" Arch. Anat. Physiol. Anat. Abt, 1893
- Satzler, K., L. F. Sohl, et al. (2002). "Three-dimensional reconstruction of a calyx of Held and its postsynaptic principal neuron in the medial nucleus of the trapezoid body." J Neurosci 22(24): 10567-79.
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