Laila confirms that her friends have ordered pizza using her visual system. Through the sensation of light, sensory information is processed and Laila is then able to see the pizza. The pupil absorbs light, by allowing light to enter the eye, and light will then be transferred to the lens. The lens is responsible for refracting light and focusing the light inside of the eye, also known as the retina. The second cranial nerve, or optic nerve, is responsible for carrying the visual signal from the eye to the optic chiasm. The optic nerve, or second cranial nerve, is located in the back of the eye. This cranial nerve transfers visual information to visual centers in the brain through many electric impulses. The optic...
... middle of paper ...
...ea include the pyramidal, extrapyramidal and cerebellar tracts. Pyramidal tracts pass through pyramids in the medulla and are responsible for gross motor acts as well as controlling motor activity. The extrapyramidal tracts are outside the pyramids and responsible for refining motor acts and regulating motor control. Cerebellar pathways are also responsible for refining motor acts. The pyramidal three tracts consist of the corticospinal tract, the corticonuclear tract, and the cortiopontine tract. The coticospinal tract projects to spinal nerves through the spinal cord. This controls Laila’s skilled movements of limbs, specifically Laila’s hands and fingers. The corticonuclear tract projects to cranial nerves and controls fine motor skills, such as Laila’s speech, allowing her to ask about the pizza. This tract innervates cranial nerves involved in speech production.
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