CNS Central Nervous System. Brain and Spinal cord – Interpretation, thought, autonomic nervous system PNS Peripheral Nervous System. Nerves in the body – Sensory receptors, Effectors
Parts of the Brain Medulla oblongata stem of brain Cerebrum the outer part of the brain Thalamus Underneath the Corpus Callosum Cerebellum Behind the Medulla oblongata and underneath the cerebrum. Hypothalamus Underneath the thalamus Pituitary Gland hangs below the hypothalamus Corpus Callosum Between the thalamus and the cerebrum Meninges thin watery layer around the CNS
What do the parts of the Brain do? Medulla oblongata – Does all the involuntary actions. Breathing, heartbeat, sneezing, coughing and etc. Cerebrum – Has two halves. Communication, higher thinking, memory. Corpus Callosum – Connects the two halves of the brain. Allows communication between the halves of the brain. Thalamus – Takes in sensory information and relays it other parts of the brain. Also does memory and emotion
Hypothalamus – Center for autonomic nervous system. – Helps maintain homeostasis, regulates thirst, hunger, water, sleep, etc. – Controls the pituitary gland – Link between nervous system and endocrine system Pituitary Gland – Releases hormones into the body. – Major part of the endocrine system Cerebellum – Maintains muscle tone. Posture, balance, ensures muscles work in a coordinated manner. Meninges – Covers the central nervous system. Protects the CNS
Voluntary and Involuntary Autonomic Nervous System – No control over. Heartbeat, breathing, sneezing, digestion, salivation. Somatic Nervous System – Have control over. When though is put into something. Picking up an object, speaking.
Parasympathetic vs. Sympathetic Parasympathetic Nervous System – Digestion, Low Heart Rate, Slow Breathing, Small Pupils. – State of rest – Neurotransmitter used is acetylcholine Sympathetic Nervous System – Fast Heart Rate, Fast Breathing, dilates bronchi, Pupils of eyes are dilated. – More oxygen for muscles. More light in to see better – Neurotransmitter used is norepinephrine – Initiated by the adrenal gland releases hormone called epinephrine. This hormone activates the Sympathetic Nervous system. Comes from the adrenal medulla.