NEUR 2200 Lecture Notes - Lecture 16: Hypothalamus, Basal Ganglia, Medial Lemniscus

• School: Carleton University
• Department: Neuroscience
• Course: NEUR 2200
• Professor: Matthew Holahan

Document Summary

Afferent nerves: information from surroundings comes into the cns via the dorsal (posterior) root fibers to the brain. Efferent nerves: information from the brain goes out through the ventral (anterior) side of the spinal cord and carry information to the muscles. Spinal cord: each spinal cord segment corresponds to a region of the body called dermatome. The higher up in the spinal cord the injury the more function is lost. Layer iv (afferent): is relatively thick in the sensory cortex but relatively thin in the motor cortex. Layer v (efferent): is relatively thick in the motor cortex and relatively thin in the sensory cortex. Informs us of the environment around us (touch, temperature, position in space, joint movement) Has a very close relationship with movement. Areas with larger number of receptors are more sensitive to stimuli (hands, lips) Humans two kinds of skins: hairy skin: less sensitivity, glabrous skin: less hair follicles and more somatosensory receptors.