field (feld)

A definite area of plane surface, considered in relation to some specific object. [A.S. feld]
auditory f. the space included within the limits of hearing of a definite sound, as of a tuning fork.
Broca's f. Broca's center
Cohnheim's f. Cohnheim's area
f. of consciousness See field of consciousness.
f. of fixation in ophthalmology, the angular distance around which the line of fixation can be turned.
f.'s 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 fiber stratum at the junction of the subthalamus and the overlying thalamus, is composed of pallidothalamic and cerebellothalamic fibers (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 fibers; 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 also lenticular loop.campi foreli, tegmental f.'s of Forel;
free f. a f. (three-dimensional space) in a homogeneous, isotropic medium free from boundaries; in practice, a f. in which boundary effects are negligible.
H f.'s See f.'s of Forel.
individuation f. the f. within which an organizer can bring about the rearrangement of primordial tissues in such a manner that a complete embryo is formed.
magnetic f. the sphere of influence of a magnet.
microscopic f. the area within which objects are visible with microscope oculars and objectives of various magnifying powers.
nerve f. the regional distribution of nerve terminals.
prerubral f. See f.'s of Forel.
tegmental f.'s of Forel f.'s of Forel
visual f. (F) the area simultaneously visible to one eye without movement; often measured by means of a bowl perimeter located 330 mm from the eye.
Wernicke's f. Wernicke's center


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