| rudimentum hippocampi | A thin layer of gray matter on the dorsal surface of the corpus callosum in which the medial and lateral longitudinal stria lie embedded. The indusium griseum is a rudimentary component of the hippocampus, continuous caudally around the splenium of the corpus callosum with the fasciolar gyrus, a slender convolution in turn continuous with the dentate gyrus of the hippocampus; rostrally the indusium griseum curves around the genu and rostrum of corpus callosum and extends ventralward to the olfactory trigone as the tenia tecta or rudimentum hippocampi, hidden in the depth of the posterior parolfactory sulcus that marks the anterior border of the subcallosal gyrus or precommissural septum. Synonym: supracallosal gyrus. (05 Mar 2000) |
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| rudimentum | 1. That which is unformed or undeveloped; the principle which lies at the bottom of any development; an unfinished beginning. "but I will bring thee where thou soon shalt quit Those rudiments, and see before thine eyes The monarchies of the earth." (Milton) "the single leaf is the rudiment of beauty in landscape." (I. Taylor) 2. Hence, an element or first principle of any art or science; a beginning of any knowledge; a first step. "This boy is forest-born, And hath been tutored in the rudiments of many desperate studies." (Shak) "There he shall first lay down the rudiments Of his great warfare." (Milton) 3. <biology> An imperfect organ or part, or one which is never developed. Origin: L. Rudimentum, fr. Rudis unwrought, ignorant, rude: cf. F. Rudiment. See Rude. Source: Websters Dictionary (01 Mar 1998) |
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| alveus hippocampi | A thin white band of fornix fibres covering the ventricular surface of the hippocampus. Synonym: alveus hippocampi. (05 Mar 2000) |
| pes hippocampi | <anatomy> The anterior thickened extremity of the hippocampus. Synonym: pes hippocampi, digitationes hippocampi. (05 Mar 2000) |
| commissura hippocampi | The triangular subcallosal plate of commissural fibres resulting from the converging of the right and left fornix bundles which exchange numerous fibres and which curve back in the contralateral fornix to end in the hippocampus of the opposite side. Synonym: commissura hippocampi, commissure of fornix, delta fornicis, hippocampal commissure, psalterium, transverse fornix. (05 Mar 2000) |
| sulcus hippocampi | A shallow groove between the dentate gyrus and the parahippocampal gyrus; the remains of a fissure extending deep into the hippocampus between Ammon's horn and the dentate gyrus which becomes obliterated during foetal development. Synonym: sulcus hippocampi, dentate fissure, fissura dentata, fissura hippocampi, hippocampal fissure. (05 Mar 2000) |
| digitationes hippocampi | Synonym: foot of hippocampus. Origin: Mod. L. Pl. Of digitatio (05 Mar 2000) |
| tenia hippocampi | A narrow sharp-edged crest of white fibre matter, continuous with the alveus hippocampi, attached to the medial border of the hippocampus; composed of efferent fibres of the hippocampus that form the fornix, fibres of the hippocampal commissure, and septohippocampal fibres. Synonym: corpus fimbriatum, tenia hippocampi. (05 Mar 2000) |
| fascia dentata hippocampi | Serrated strip of gray matter under the medial border of the hippocampus and in its depths. It is an archicortex which develops along the edge of the hippocampal fissure and which consists of molecular, granular, and polymorphic layers. The molecular layer is continuous with that of the hippocampus in the depths of the hippocampal fissure. (carpenter and sutin, human neuroanatomy, 8th ed, p626) (12 Dec 1998) |
| fimbria hippocampi | A narrow sharp-edged crest of white fibre matter, continuous with the alveus hippocampi, attached to the medial border of the hippocampus; composed of efferent fibres of the hippocampus that form the fornix, fibres of the hippocampal commissure, and septohippocampal fibres. Synonym: corpus fimbriatum, tenia hippocampi. (05 Mar 2000) |
| fissura hippocampi | A shallow groove between the dentate gyrus and the parahippocampal gyrus; the remains of a fissure extending deep into the hippocampus between Ammon's horn and the dentate gyrus which becomes obliterated during foetal development. Synonym: sulcus hippocampi, dentate fissure, fissura dentata, fissura hippocampi, hippocampal fissure. (05 Mar 2000) |
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