Niizuma, Y. Torsional diplopia: Weakness of intorsion results in torsional diplopia, in which two different visual fields, tilted with respect to each other, are seen at the same time. Rev Optom May 15; 5 It then enters the orbit through the superior orbital fissure and innervates the lateral rectus muscle of the eye. All these muscles are derivatives of the second pharyngeal arch. The oculomoter nerve cranial nerve III controls eye movement, such as constriction of the pupil and open eyelids.
Upper motor neuron
This process is also called the stretch reflex. Hidden categories: CS1 maint: archived copy as title CS1 errors: missing periodical Articles needing additional references from May All articles needing additional references. These tracts also serve as the place of origin for lower motor neurons. Augustine, D. Muscle fibers and other neurons. Trost, et al.
Upper motor neuron - Wikipedia
The cells that make up the primary motor cortex are Betz cells , which are a type of pyramidal cell. Axon hillock. Epineurium Perineurium Endoneurium. A motor neuron or motoneuron is a neuron whose cell body is located in the motor cortex , brainstem or the spinal cord , and whose axon fiber projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs, mainly muscles and glands.
Description: A single motor neuron may innervate many muscle fibres and a muscle fibre can undergo many action potentials in the time taken for a single muscle twitch. In addition to voluntary skeletal muscle contraction, alpha motor neurons also contribute to muscle tone , the continuous force generated by noncontracting muscle to oppose stretching. Bibcode : PLoSO The Spinal Cord and Spinal Nerves.