Where is the medial longitudinal fasciculus located?
brainstem
The medial longitudinal fasciculus is found in the brainstem and is a set of crossed fibers with ascending and descending fibers. The medial longitudinal fasciculus links the three main nerves which control eye movements, i.e. the oculomotor, trochlear and the abducent nerves, as well as the vestibulocochlear nerve.
What structures are connected via the medial longitudinal fasciculus?
The Medial Longitudinal Fasciculus The MLF is a fiber tract located directly ventrolateral to the oculomotor nucleus that interconnects the oculomotor nucleus, trochlear nucleus, and abducens nucleus (Figure 1).
What does medial longitudinal fasciculus mean?
The medial longitudinal fasciculus (MLF) is a myelinated composite fiber tract found in the brainstem. The MLF primarily serves to coordinate the conjugate movement of the eyes and associated head and neck movements.
What role does the medial longitudinal fasciculus play in oculomotor control?
The axons of the abducens interneurons decussate and travel in the medial longitudinal fasciculus to the contralateral oculomotor nucleus to excite the motor neurons controlling the medial rectus of the eye contralateral to the abducens nucleus.
What is lateral longitudinal fasciculus?
Definition: The lateral longitudinal fascicule is an ascending bundle of axons. The LLF contains fibers of the auditory and mechanosensory systems which originate in the primary sensory brainstem nuclei and terminate in the torus semicircularis.
What does the medial longitudinal fasciculus do in the ventral horn of the upper cervical spinal cord?
Fibers from the medial vestibular nucleus descend the spinal cord in the medial longitudinal fasciculus located in a dorsal area of the ventral funiculus. These fibers synapse in the cranial area of the thoracic spinal cord with cervical motoneurons that control head position and maintain equilibrium.
Where are the vestibular nuclei located?
The vestibular nuclei are located in the medulla and pons of the hindbrain. It is a complex composed of four major nuclei that integrate information from the primary vestibular afferents, contralateral nuclei, somatosensory organs, and the cerebellum.
What’s a fasciculus?
Medical Definition of fasciculus : a slender bundle of fibers: a : a bundle of skeletal muscle cells bound together by fasciae and forming one of the constituent elements of a muscle.
Where is the superior longitudinal fasciculus?
The superior longitudinal fasciculus (SLF) is an association tract in the brain that is composed of three separate components. It is present in both hemispheres and can be found lateral to the centrum semiovale and connects the frontal, occipital, parietal, and temporal lobes.
What are the 4 vestibular pathways?
Four pathways are known to transmit vestibular inputs to the thalamus: the medial longitudinal fasciculus, the ascending tract of Deiter, the crossing ventral tegmental tract and the ipsilateral vestibulo-thalamic tract (Zwergal et al., 2009).
The medial longitudinal fasciculus (MLF) is one of a pair of crossed over tracts, on each side of the brainstem. These bundles of axons are situated near the midline of the brainstem and are made up of both ascending and descending fibers that arise from a number of sources and terminate in different areas.
What is the medial longitudinal fasciculus and internuclear opthalmoparesis?
The Medial Longitudinal Fasciculus and Internuclear Opthalmoparesis: There’s More Than Meets the Eye Background and purpose The classic sign of a lesion in the medial longitudinal fasciculus is internuclear opthalmoplegia. However, clinical presentation may vary depending on the type of pathology and the lesion location.
Where are medial longitudinal fasiculus lesions located in cerebral artery entrapment?
Two-thirds of medial longitudinal fasiculus lesions were located in the upper, mid, or lower pons with the remaining located in the midbrain. Of the patients presenting with a cerebrovascular accident, there was little to no additional evidence of acute stroke elsewhere in the brain.
What is the classic sign of a lesion in medial fasciculus?
Background and purpose The classic sign of a lesion in the medial longitudinal fasciculus is internuclear opthalmoplegia. However, clinical presentation may vary depending on the type of pathology and the lesion location.