| Forel'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) |
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| Forel, Auguste | <person> Swiss neurologist, 1848-1931. See: Forel's decussation, fields of Forel, tegmental fields of Forel. (05 Mar 2000) |
| foreland | 1. A promontory or cape; a headland; as, the North and South Foreland in Kent, England. 2. A piece of ground between the wall of a place and the moat. 3. <marine biology> That portion of the natural shore on the outside of the embankment which receives the stock of waves and deadens their force. (06 Mar 1998) |
| forelimb | A front limb of a quadruped. (12 Dec 1998) |
| forelock | 1. The lock of hair that grows from the forepart of the head. 2. <mechanics> A cotter or split pin, as in a slot in a bolt, to prevent retraction; a linchpin; a pin fastening the cap-square of a gun. Forelock bolt, a bolt retained by a key, gib, or cotter passing through a slot. Forelock hook, a winch or whirl by which a bunch of three yarns is twisted into a standard. To take time, or occasion, by the forelock, to make prompt use of anything; not to let slip an opportunity. "Time is painted with a lock before and bald behind, signifying thereby that we must take time by the forelock; for when it is once past, there is no recalling it." (Swift) "On occasion's forelock watchful wait." (Milton) Source: Websters Dictionary (01 Mar 1998) |
| tegmental fields of Forel | Three circumscript, myelin-rich regions of the subthalamus known as H fields (from Haubenfelder); 1) field H1, corresponding to the thalamic fasciculus, a horizontal fibre stratum at the junction of the subthalamus and the overlying thalamus, is composed of pallidothalamic and cerebellothalamic fibres (brachium conjunctivum) and is separated by the zona incerta from the more ventrally placed field H2; 2) field H2, formed by the lenticular fasciculus and arching over the dorsal border of the subthalamic nucleus, is composed largely of pallidothalamic fibres; 3) field H3 or prerubral field, is a large field of intermingling gray and white matter immediately rostral to the red nucleus, uniting fields H1 and H2 around the medial margin of the zona incerta; its gray matter forms the prerubral nucleus. See: lenticular loop. Synonym: campi foreli, tegmental fields of Forel. (05 Mar 2000) |
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| fields of Forel | Three circumscript, myelin-rich regions of the subthalamus known as H fields (from Haubenfelder); 1) field H1, corresponding to the thalamic fasciculus, a horizontal fibre stratum at the junction of the subthalamus and the overlying thalamus, is composed of pallidothalamic and cerebellothalamic fibres (brachium conjunctivum) and is separated by the zona incerta from the more ventrally placed field H2; 2) field H2, formed by the lenticular fasciculus and arching over the dorsal border of the subthalamic nucleus, is composed largely of pallidothalamic fibres; 3) field H3 or prerubral field, is a large field of intermingling gray and white matter immediately rostral to the red nucleus, uniting fields H1 and H2 around the medial margin of the zona incerta; its gray matter forms the prerubral nucleus. See: lenticular loop. Synonym: campi foreli, tegmental fields of Forel. (05 Mar 2000) |