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Anatomy & Physiology Nervous System.

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Presentation on theme: "Anatomy & Physiology Nervous System."— Presentation transcript:

1 Anatomy & Physiology Nervous System

2 Nervous System 2 main sections Central Nervous System (CNS)
Peripheral Nervous System (PNS)

3 Central Nervous System
Brain = mass of nerve tissue Weigh about 3 lbs. Reaches full about 6yrs. Old 3 – 5 min. supply of oxygen for nerve cells Blood brain barrier = blood flowing is filtered; harmful chemicals cannot enter the brain

4 Spinal Cord Connected from medulla oblongata to lower back (lumbar)
Vertebrae surround & protect spinal cord Responsible for carrying info to the brain & to body cells

5 Meninges 3 layer covering of the brain & spinal cord (protects)
Dura matter Tough outer membrane Arachnoid membrane Web like middle layer Pia mater Inner layer; attached to brain Cerebrospinal fluid (CSF) = clear, watery liquid surrounding brain & spinal cord (cushions)

6 Sections of the Brain Cerebrum Largest section Separated into lobes
Responsible for reasoning, thoughts, emotions, memory, speech, senses, movement

7 Cerebellum Located below the back of the cerebrum
Responsible for muscle coordination, balance, posture, muscle tone

8 Diencephalon Hypothalamus Thalamus
Regulates temp. appetite, water balance, sleep, & blood vessels Thalamus Directs sensory impulses

9 Brainstem Midbrain Pons Medulla oblongata
Responsible for conducting eye & auditory reflexes Pons Responsible for certain reflexes (chewing, saliva) Assist with respirations Medulla oblongata Connects with spinal cord Responsible for regulating heartbeat, respirations, swallowing, coughing, & blood pressure

10 Peripheral Nervous System
2 types of systems Somatic Autonomic 12 pairs of cranial nerves (along with spinal nerves) Responsible for special senses

11 Autonomic Maintains a balance of involuntary functions
Sympathetic / Parasympathetic maintains balance (homeostasis) Sympathetic – prepares the body for an emergency (increases heart rate, blood pressure) Parasympathetic – after an emergency (slows the body actions)

12 Structures of the Brain
Corpus Callosum Large bundle of nerve fibers Connects L & R hemispheres Cerebellum Regulates balance, posture, movement, muscle coordination

13 Structures Spinal Cord Medulla Oblongata
Connects to the medulla oblongata Medulla Oblongata Top portion of the spinal cord Controls automatic functions (heartbeat, breathing)

14 Structures Pons Pituitary gland Hypothalmus
Connects cerebrum with cerebellum Pituitary gland Attach to the base of brain; secretes hormones Hypothalmus Regulates temp., appetite, sleep, blood vessels

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