EEH103 Lecture 7: nervous system
WEEK 7 NOTES:
NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM:
oFUNCTIONS:
- Coordinate all the body’s activities
- Controls the maintenance of normal function and also the body’s ability to cope with
emergency situations
-Sensory: gathers information from inside the body and the outside environment.
: carries information to the central nervous system
-Interpretative: information is processed and interpreted
-Motor: convey information from the CNS to the muscles and the glands of the body
SENSORY NEURONS:
- Carry messages from a receptor to the brain
- The brain interprets the message
- Motor neurons send the messages to an effector in muscles and glands
oSTRUCTURE:
Divided into two parts:
CENTRAL NERVOUS SYSTEM: brain and spinal cord
- Controls most functions of the body and mind
- Is the processing centre for the nervous system
- Receives information from and sends information to the peripheral nervous system
THE BRAIN:
- CEREBRUM: largest part of the brain, centre of thought and intelligence
: divided into two hemispheres (right= left side of body, left= right side of
body)
: frontal lobe (thinking speech, movement), parietal lobe (perceiving
sensations, processing sounds) temporal lobe (hearing, memory), occipital lobe (visual
perception)
- CEREBELLUM: lies below the cerebrum at the back of the skull
: controls voluntary muscles, balance and muscle tone
- BRAIN STEM: mainly neural tissue that allows nerve impulses to travel between the
brain and the spinal cord
: control centre for the involuntary movement of the vital body organs
(heart, lungs)
THE SPINAL CORD
- Vertebrae= bones that make up the spinal column
- Discs separate the vertebrae = shock absorption
- Ligaments hold vertebrae together
- Muscles are attached to bones and allows for movement
- Connected to the brain
- 45 cm long (medulla down to the second lumbar vertebrae)
- Ascending nerve tracks carry sensory information from the body to the brain
Document Summary
Controls the maintenance of normal function and also the body"s ability to cope with emergency situations. Sensory: gathers information from inside the body and the outside environment. : carries information to the central nervous system. Motor: convey information from the cns to the muscles and the glands of the body. Carry messages from a receptor to the brain. Motor neurons send the messages to an effector in muscles and glands: structure: Controls most functions of the body and mind. Is the processing centre for the nervous system. Receives information from and sends information to the peripheral nervous system. Cerebrum: largest part of the brain, centre of thought and intelligence. : divided into two hemispheres (right= left side of body, left= right side of body) : frontal lobe (thinking speech, movement), parietal lobe (perceiving sensations, processing sounds) temporal lobe (hearing, memory), occipital lobe (visual perception) Cerebellum: lies below the cerebrum at the back of the skull.