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In humans, the tectospinal tract (or colliculospinal tract) is a decussating extrapyramidal tract that coordinates head/neck and eye movements. [ 1 ] It arises from the superior colliculus of the mesencephalic (midbrain) tectum , and projects to the cervical and upper thoracic spinal cord levels. [ 2 ]
The anterolateral system (ALS) is a bundle of afferent somatosensory fibers from different ascending tracts in the spinal cord. These fibers include those of the spinomesencephalic tract, spinothalamic tract, and spinoreticular tract amongst others. [5]
In anatomy, the extrapyramidal system is a part of the motor system network causing involuntary actions. [1] The system is called extrapyramidal to distinguish it from the tracts of the motor cortex that reach their targets by traveling through the pyramids of the medulla.
The pyramidal tracts include both the corticobulbar tract and the corticospinal tract.These are aggregations of efferent nerve fibers from the upper motor neurons that travel from the cerebral cortex and terminate either in the brainstem (corticobulbar) or spinal cord (corticospinal) and are involved in the control of motor functions of the body.
The tectospinal tract originates in the superior colliculus and tectum of the mesencephalon (midbrain). It projects to the cervical and upper thoracic spinal cord to mediate reflex turning of the head and trunk in the direction of startling sensations. In the medulla oblongata, it descends within the MLF.
colliculospinal tract (tectospinal tract) from the superior colliculus to lower motor neurons: Involved in involuntary adjustment of head position in response to visual information. rubrospinal tract: from red nucleus to lower motor neurons: Involved in involuntary adjustment of arm position in response to balance information; support of the body.
In neuroanatomy, the lateral geniculate nucleus (LGN; also called the lateral geniculate body or lateral geniculate complex) is a structure in the thalamus and a key component of the mammalian visual pathway.
It is one of the pathways for the mediation of involuntary movement, along with other extra-pyramidal tracts including the vestibulospinal, tectospinal, and reticulospinal tracts. The rubrospinal fibers generally excite flexor motor neurons and inhibit the extensor motor neurons. [ 6 ]