| decussation of the fillet | The intercrossing of the fibres of the left and right medial lemniscus ascending from the gracile and cuneate nuclei, immediately rostral to the level of the decussation of the pyramidal tracts in the medulla oblongata. Synonym: decussatio lemniscorum, decussatio sensoria, decussation of the fillet, sensory decussation of medulla oblongata. (05 Mar 2000) |
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| medial fillet | A band of white fibres originating from the gracile and cuneate nuclei and decussating in the lower medulla; thence it passes upward through the centre of the medulla oblongata, close to the median raphe; on entering the pons it spreads out laterally to form a flat band ascending over the dorsal border of the pontine nuclei; in the mesencephalon it passes over the dorsal border of the substantia nigra and is displaced laterally by the red nucleus; passing medial to the medial geniculate body, the bundle enters and terminates in the ventral posterior nucleus of the thalamus. Throughout their course, the fibres retain a somatotopic order such that those originating from the gracile nucleus and representing the lower extremity lie lateral to those originating in the cuneate nucleus and representing the arm. The medial lemniscus conveys somatic-sensory information involved in tactile discrimination (two-point discrimination), position sense, and vibration sense. Synonym: lemniscus medialis, medial fillet, Reil's band, Reil's ribbon. (05 Mar 2000) |
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| triangle of fillet | A triangular area on the lateral surface of the caudal half of the mesencephalon, bordered caudally by the slight prominence of the lateral lemniscus, dorsally by the base of the inferior colliculus and the brachium of the superior colliculus, and ventrally by the crus cerebri. Synonym: Reil's triangle, triangle of fillet, trigone of fillet, trigonum lemnisci. (05 Mar 2000) |
| trigone of fillet | A triangular area on the lateral surface of the caudal half of the mesencephalon, bordered caudally by the slight prominence of the lateral lemniscus, dorsally by the base of the inferior colliculus and the brachium of the superior colliculus, and ventrally by the crus cerebri. Synonym: Reil's triangle, triangle of fillet, trigone of fillet, trigonum lemnisci. (05 Mar 2000) |
| fillet | 1. A little band, especially one intended to encircle the hair of the head. "A belt her waist, a fillet binds her hair." (Pope) 2. A piece of lean meat without bone; sometimes, a long strip rolled together and tied. A fillet of beef is the under side of the sirlom; also called tenderloin. A fillet of veal or mutton is the fleshy part of the thigh. A fillet of fish is a slice of flat fish without bone. "Fillet of a fenny snake." 3. A thin strip or ribbon; especially., A strip of metal from which coins are punched. A strip of card clothing. A thin projecting band or strip. 4. <machinery> A concave filling in of a reentrant angle where two surfaces meet, forming a rounded corner. 5. A narrow flat member; especially, a flat molding separating other moldings; a reglet; also, the space between two flutings in a shaft. 6. An ordinary equaling in breadth one fourth of the chief, to the lowest portion of which it corresponds in position. 7. <mechanics> The thread of a screw. 8. A border of broad or narrow lines of colour or gilt. 9. The raised molding about the muzzle of a gun. 10. Any scantling smaller than a batten. 11. <anatomy> A fascia; a band of fibres; applied especially. To certain bands of white matter in the brain. 12. The loins of a horse, beginning at the place where the hinder part of the saddle rests. Arris fillet. See Arris. Origin: OE. Filet, felet, fr. OF. Filet thread, fillet of meat, dim. Of fil a thread, fr. L. Filum. See Fille a row. Source: Websters Dictionary (01 Mar 1998) |
| fillet layer | A largely fibrous (hence whitish) layer of the superior colliculus separating the middle gray layer of superior colliculus from the deep gray layer of superior colliculus and containing, among others, fibres from the spinal and trigeminal lemnisci. Synonym: fillet layer. (05 Mar 2000) |
| lateral fillet | A bundle of ascending fibres that originate from the cochlear and auditory relay nuclei of the rhombencephalon, enter the trapezoid body, a transverse fibre stratum in which about half their number decussate, and from here turn rostrally along the lateral side of the spinothalamic tract; in the midbrain, it arches dorsally and enters the inferior colliculus in which all of its fibres terminate; the auditory pathway is transsynaptically extended from here by the brachium of the inferior colliculus to the medial geniculate body of the thalamus, from which in turn the auditory radiation leads to the auditory cortex; intercalated in the trapezoid body and along the ascending trajectory of the lemniscus are several cell groups in which part of the fibres synapse. Synonym: lemniscus lateralis, acoustic lemniscus, auditory lemniscus, auditory tract, lateral fillet. (05 Mar 2000) |
| ventral tegmental decussation | See: tegmental decussations. (05 Mar 2000) |
| Meynert's decussation | The dorsal tegmental decussation (fountain or Meynert's decussation, decussatio fontinalis) of the left and right tectospinal and tectobulbar tracts, the ventral tegmental decussation (rubrospinal or Forel's decussation) of the left and right rubrospinal and rubrobulbar tracts; both are located in the mesencephalon. Synonym: decussationes tegmenti. (05 Mar 2000) |
| rubrospinal decussation | See: tegmental decussations. (05 Mar 2000) |
| Wernekinck's decussation | The decussation of the left and right superior cerebellar peduncles in the tegmentum of the caudal mesencephalon. Synonym: decussatio pedunculorum cerebellarium superiorum, decussatio brachii conjunctivi, decussation of brachia conjunctiva, Wernekinck's decussation. (05 Mar 2000) |
| motor decussation | The intercrossing of the bundles of the pyramidal tracts at the lower border region of the medulla oblongata. Synonym: decussatio pyramidum, decussatio motoria, motor decussation. (05 Mar 2000) |
| Held's decussation | The crossing of some of the fibres arising from the cochlear nuclei to form the lateral lemniscus. (05 Mar 2000) |
| sensory decussation of medulla oblongata | The intercrossing of the fibres of the left and right medial lemniscus ascending from the gracile and cuneate nuclei, immediately rostral to the level of the decussation of the pyramidal tracts in the medulla oblongata. Synonym: decussatio lemniscorum, decussatio sensoria, decussation of the fillet, sensory decussation of medulla oblongata. (05 Mar 2000) |
| pyramidal decussation | The intercrossing of the bundles of the pyramidal tracts at the lower border region of the medulla oblongata. Synonym: decussatio pyramidum, decussatio motoria, motor decussation. (05 Mar 2000) |
| decussation | Act of crossing at an acute angle, or state of being thus crossed; an intersection in the form of an X; as, the decussation of lines, nerves, etc. Origin: L. Decussatio. Source: Websters Dictionary (01 Mar 1998) |
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