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Topic # 5: Sensory Motor Systems 3: Visuomotor Coordination.docx

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Kinesiology & Health Science
KINE 3020
Denise Henriques

Saad S. Khan HH/KINE - 3020 25th September 2013 Skilled Performance & Motor Learning Lecture # 5 Topic # 5: Sensory Motor Systems 3: Visuomotor Coordination Q1] How does vision help us guide our movements? Ans] By allowing us to: - Monitor body position and motion - To determine the goal of our movements - where we want to move THE EYE  Receptors for vision [Photoreceptors] are located on back of the eyeball, specifically on the retina  The concentration of receptors exist on a small part of the retina known as "Fovea" where the image is sense in high resolution. That is why eyes need to be moved in order for the images fall on the fovea.  Images that fall outside the Fovea cannot be coded in colour or good resolution. Their only good for detecting information but not for high resolution or colour vision. - The "Optic Nerves" are those axons that exit the eye from interneurons that receive information from the photo receptors - The "Optic Chiasm" is where the medial part of the interneurons from each respective eyes cross over. - The "Optic Tract" are axons where the "Left Optic Tract" would make up the left side of each of the two eyes while the "Right Optic Tract" would make up the right side of the two eyes. - The "Lateral Geniculate Nucleus"[LGN] which is located in the thalamus, is where the "Optic Tracts" are projected/ synapse or meet. 1 | P a g e Saad S. Khan HH/KINE - 3020 25th September 2013 Skilled Performance & Motor Learning - The Neurons from the "LGN" then project/synapse or meet on to the "Primary Visual Cortex"[V1] , located on the back of the head in the "Occipital Lobe". - Some neurons that exit from the eyes do not go to the "LGN" and instead project/synapse or meet to parts of the brainstem, specifically the midbrain, more specifically the "Superior Colliculus"[SC] & the "Pretectal Area" - For voluntary movements the first pathway involving the "thalamus" is involved. - While for Reflexive eye movements the Pathway of the "SC" & "Tectum" p
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