tectospinal tract

(redirected from Loewenthal bundle)

tec·to·spi·nal tract

[TA]
a bundle of thick, heavily myelinated fibers originating in the deep layers of the superior colliculus, crossing to the opposite side in the dorsal tegmental decussation, descending along the median plane, between the medial longitudinal fasciculus dorsally and the medial lemniscus ventrally, and into the anterior funiculus of the spinal cord. The tract ends in the medial region of the anterior horn of the cervical spinal cord, and appears to be involved in head movements during visual and auditory tracking. Throughout its course in the brainstem, it is accompanied by fibers of the tectobulbar tract.

tectospinal tract

A nerve tract that passes from the tectum of the midbrain through the medulla to the spinal cord; most of the fibers cross to the other side of the body.

Held,

Hans, German anatomist, 1866-1942.
Held bundle - a bundle of thick, heavily myelinated fibers that ends in the medial region of the anterior horn of the cervical spinal cord and appears to be involved in head movements during visual and auditory tracking. Synonym(s): tectospinal tract
Held decussation - the crossing of some of the fibers arising from the cochlear nuclei to form the lateral lemniscus.

Loewenthal,

Wilhelm, German physician, 1850-1894.
Loewenthal bundle - a bundle of thick, heavily myelinated fibers that ends in the medial region of the anterior horn of the cervical spinal cord and appears to be involved in head movements during visual and auditory tracking. Synonym(s): Loewenthal tract; tectospinal tract
Loewenthal reaction - the agglutinative reaction in relapsing fever.
Loewenthal tract - Synonym(s): Loewenthal bundle

Marchi,

Vittorio, Italian physician, 1851-1908.
Marchi fixative - used to demonstrate degenerating myelin.
Marchi reaction - failure of the myelin sheath of a nerve to blacken when submitted to the action of osmic acid.
Marchi stain - a method for demonstrating fat and degenerating nerve fibers.
Marchi tract - a bundle of thick, heavily myelinated fibers originating in the deep layers of the superior colliculus. Synonym(s): tectospinal tract