(fas′ĭ-kél) [L. fasciculus, little bundle] A small bundle; a fasciculus. SEE: fasciculus.
(fă-sik′yŭ-lăr) [fasiculus] 1. Arranged like a bundle of rods. 2. Pert. to a fasciculus.
(fă-sĭk″ū-lā′shŭn) 1. Formation of fascicles. 2. Involuntary contraction or twitching of muscle fibers, visible under the skin. 3. Spontaneous contractions of muscle fibers that do not cause movement at a joint.
(fă-sik′yŭ-lŭs, fă-sik′yŭ-lī″) pl. fasciculi [L. fasciculus, a small bundle] 1. A small bundle of longitudinal elements, e.g., muscle fibers. 2. A bundle of axons. Peripheral nerves can contain one or more axonal fasciculi. In the brain and spinal cord, many of the fasciculi are named, and fasciculus and tract are synonymous.
arcuate f. A myelinated association tract connecting the superior and middle gyri of the frontal lobe with the ipsilateral temporal lobe.
f. gracilis The more medial of the two large ascending axon tracts that fill the posterior funiculus of the spinal cord. This fasciculus contains spinal ganglion cell axons transmitting fine touch, conscious proprioception, and vibratory sense from the legs and trunk.
medial longitudinal f. ABBR: MLF. A long, discrete axon tract running ventrally, close to the midline, through the brainstem and upper spinal cord. With contributions from the vestibulospinal tracts, the medial longitudinal fasciculus is the main pathway by which equilibrium and balance information reaches lower motor neuron circuits to automatically adjust eye, neck, and limb movements to match sensory signals from the semicircular canals. SYN: medial longitudinal bundle.
posterolateral f. Lissauer tract.
f. retroflexus The main output tract from the habenular nuclei, which lie above the thalamus. It innervates the interpeduncular nuclei, which then send axons to the median raphe nuclei of the midbrain SYN: habenulo-interpeduncular tract.
superior longitudinal f. A myelinated axon tract lying under the cerebral cortex. It is a long association tract that interconnects the superior and middle gyri of the frontal lobe with the ipsilateral parietal and occipital lobes.
uncinate f. A compact, myelinated axon tract lying under the cerebral cortex. It is a long association tract that interconnects the frontal association cortex of the frontal lobe with the inferior temporal association cortex of the ipsilateral temporal lobe.
(făsh″ē-ĕk′tō-mē) [L. fascia, band, + Gr. ektome, excision] Excision of strips of fascia.
(fash″ē-īt′ĭs, fas″ē-īt′ĭs) [fascia + -itis] Inflammation of a fascia.
eosinophilic f. A frequently painful inflammation of muscle fascia, along with overlying contracture of the skin, esp. on the medial surface of the upper arms. Eosinophilia is present in most affected patients. ...