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Encyclopedia > Medial longitudinal fasciculus

The medial longitudinal fasciculus (MLF) is a group of axons on each side of the brainstem, that carry information about the direction that the eyes should move. An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, which conducts electrical impulses away from the neurons cell body or soma. ... The brain stem is the stalk of the brain below the cerebral hemispheres. ... Diagram of a human eye. ...

It connects the cranial nerve nuclei III, IV and VI together, as well as the gaze centres and information about head movement (from cranial nerve VIII). Cranial nerves are nerves which start directly from the brainstem instead of the spinal cord. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The fourth of twelve cranial nerves, the trochlear nerve controls the function of the superior oblique muscle, which rotates the eye towards the nose and also moves the eye downward. ... The sixth out of twelve cranial nerves, the abducens nerve controls the lateral rectus muscle - this means that the action of this nerve controls each eyes ability to look laterally (away from the midline). ... The vestibulocochlear nerve is the eighth of twelve cranial nerves, and also known as the auditory nerve. ...

It also descends into the cervical spinal cord, and innervates some muscles of the neck. The spinal cord is a part of the vertebrate nervous system that is enclosed in and protected by the vertebral column (it passes through the spinal canal). ... The neck is the part of the body on many limbed vertebrates that distinguishes the head from the torso or trunk. ...

The (MLF) arises from the Vestibular Nucleus (VN) and is thought to be involved in the maintainance of gaze. This is achived by inputs to the VN from

1. the Vestibulocochlear (8th cranial) nerve about head movements,

2. gain adjustments from the floculus of the cerebellum,

3. head and neck propioceptors and foot and ankle muscle spindle, via the fastigial nucleus

  Results from FactBites:
Medial longitudinal fasciculus - Wikipedia, the free encyclopedia (360 words)
Lemniscus (in blue) with a’ the medial lemniscus and a" the lateral lemniscus.
The medial longitudinal fasciculus (MLF) is a pair of crossed fiber tracts (group of axons), one on each side of the brainstem, that carry information about the direction that the eyes should move.
The MLF arises from the Vestibular nucleus (VN) and is thought to be involved in the maintenance of gaze.
IX. Neurology. 4b. The Mid-brain or Mesencephalon. Gray, Henry. 1918. Anatomy of the Human Body. (3293 words)
The medial surface of the peduncle forms the lateral boundary of the interpeduncular fossa, and is marked by a longitudinal furrow, the oculomotor sulcus, from which the roots of the oculomotor nerve emerge.
Thicker medially than laterally, it reaches from the oculomotor sulcus to the lateral sulcus, and extends from the upper surface of the pons to the subthalamic region; its medial part is traversed by the fibers of the oculomotor nerve as these stream forward to reach the oculomotor sulcus.
The principal gray masses of the tegmentum are the red nucleus and the interpeduncular ganglion; of its fibers the chief longitudinal tracts are the superior peduncle, the medial longitudinal fasciculus, and the lemniscus.
  More results at FactBites »



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