Spinal Cord part I.pdf

SOMATIC NERVOUS SYSTEM AUTONOMIC NERVOUS SYSTEM Covered in Anatomy  Motor Pathways with the spinal cord Alpha and gamma motor neurons YOU SHOULD KNOW FROM ANATOMY AND PT EXAM AND INTERVENTIONS During fifth week of development, peripheral nerves extend from limb plexuses int...

SOMATIC NERVOUS SYSTEM AUTONOMIC NERVOUS SYSTEM Covered in Anatomy  Motor Pathways with the spinal cord Alpha and gamma motor neurons YOU SHOULD KNOW FROM ANATOMY AND PT EXAM AND INTERVENTIONS During fifth week of development, peripheral nerves extend from limb plexuses into the limb bud On this slide Identify Grey mater structures Dorsal horn Ventral horn Lateral horn (intermediate zone) Identify whit mater structures Dorsal column Ventral column Lateral column Later in the presentation these structures will be defined This was previously covered by Dr. Pelletier in Summer Anatomy. So this is reinforcement of knowledge. On these sections, the myelin is stained so the white matter is dark. The lighter areas a the gray mater. Look how big the ventral horn is. Size does mater; it means there a re more neuron cell bodies. Why would the grey mater have more cell bodies in the cervical spinal cord? Where to the preganglionic sympathetic neurons project to? This is a good time to start chunking information in your studies. You will be asked to make a link between Rexed’s laminae and nuclei name, From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. From Lundy-Ekman, L. Neuroscience: Fundamentals for Rehabilitation, 3rd Edition (2007), p. 308. Key concept in brain organization: Somatotopic organization  In development differentiation of motor unit and fiber types are determine by activation pattern http://jp.physoc.org/content/150/2/417.full.pdf Why would this be important for proprioception? Spinal cord reflexes are phasic: Short duration muscle response to sensory input. Increased tension in muscle tendon cause firing of 1b sensory axons from the Golgi tendon organs (GTO). Excites a inhibitory interneuron resulting inhibition of the agonist muscle. Muscle spindles activation excites agonist muscle GTO activation inhibits the agonist muscle What are you activating when testing for reflexes?