The Spinal Cord Spinal Cord: link between the brain & rest of the body Reflexes: involuntary movements Reflex arc: pathway your reflex impulse travels –knee tapped –sensory receptor sends impulse to spinal cord –triggers motor neuron- muscle contracts
The Peripheral Nervous System SENSORY DIVISION –Sends impulses from sense organs to central nervous system MOTOR DIVISION –Sends impulses from central nervous system to muscles or glands –2 parts Somatic System Autonomic System Ex: sight, touch
Somatic & Autonomic Nervous Systems Somatic Nervous System –Activities like movement of skeletal muscle –Under conscious control Autonomic Nervous System –Involuntary, unconscious control –2 parts Sympathetic –Helps body respond to stress Parasympathetic –Keeps body maintaining homeostasis
10 Is it a somatic or autonomic? Pulling your hand back from a hot stove 10
11 Is it a somatic or autonomic? Raising your hand in class 11
Your Assignment Draw a Brain (pg 901) –Include the major parts of the brain: Cerebrum, Cerebellum, Medulla Oblongata & Spinal Cord. –Include the Important glands within the brain: Thalamus, Hypothalamus & Pituitary. Use color and label everything! This is going to be part of a human body poster, so make sure it is nicely done!