A&P - Chapter 20 (Part 1) Flashcards
What are the 3 organs of the nervous system?
- Brain
- Spinal cord
- Nerves
What are 2 types of nerves?
- Cranial
2. Spinal
What are 4 sensory organs?
- Eyes
- Ears
- Specialized sensory organs
- Free nerve endings
- eg. skin
What are 2 parts of the CNS?
- Brain
2. Spinal cord
What is the CNS protected by?
By structures of the skeletal system and integumentary
What are 2 examples of bones that cover the CNS?
- Cranial bones
- brain - Vertebrae
- spinal cord
What is the inner covering for protection of the CNS?
Meninges
What is so important about the brain stem?
Necessary for survival
- everyone/animal has it
Meninges
A tube like covering around the spinal cord
What does the meninges line?
The vertebral foreman of each vertebra surrounding it
- extend around the brain for full closure
What are the 3 layers of the meninges?
- Dura mater
- Arachnoid mater
- Pia mater
What is the outer most layer of the meninges?
Dura mater
Dura mater
Strong white fibrous tissue that lines the vertebral canal
- outermost layer
What is the middle layer of meninges?
Arachnoid mater
Arachnoid mater
Delicate cushioning layer
What does the arachnoid mater contain?
Fluid
- CSF
What is the brain stem responsible for?
Breathing
What is the bottom layer of the meninges?
Pia mater
Pia mater
Transparent layer that adheres to the surface of the brain and spinal cord
What does pia mater form?
Delicate filum terminal
What is another word for dura mater?
Hard mother
What is another word for arachnoid mater?
Spider wed mother
What is another word for pia mater?
Delicate mother
What are the 3 inward extensions of the dura matter?
- Flax cerebri
- Flax cerebelli
- Tentorium cerebelli
Where does the flax cerebri project?
Downward
What does the flax cerebri create?
A partition between the two cerebral hemispheres
What does the flax cerebelli separate?
The two hemispheres of the cerebellum
What does the tentorium cerebelli separate?
The cerebellum from the cerebrum
What does the tenrorium cerebelli form?
A tent like covering over the cerebellum
Flax
Sickle
Epidural space
Immediately outside the dura mater, inside the vertebrae/skull
Subdural space
Between dura and arachnoid mater
What does the subdural space contain?
Serous fluid
Subarachnoid space
Between arachnoid and pia mater
What does subarachnoid space contain?
A significant amount of cerebrospinal fluid
CSF
Cerebrospinal fluid
