CH11

Question 1

Functions of Nervous system?

Answer 1

1. Sensory Imput
2. Integration
3. Motor output

Question 2

Divisions of the Nervous system?

Answer 2

1. Central nervous system CNS
   - brain + spinal (command center)
2. Peripheral nervous system PNS
   - transmits impulses from CNS to effector organs

Question 3

2 functional divisions of the PNS?

Answer 3

1. Sensory (afferent) division-
   - somatic afferent fibers- convey impulses from skin, skeletal muscles, joints
   - visceral afferent fibers- convey impulses from visceral organs
2. Motor (efferent) division-
   - transmits impulses from CNS to effector organs

Question 4

Motor divisions of PNS?

Answer 4

1. Somatic (voluntary)
2. Autonomic (involuntary) nervous system- regulates smooth muscle, cardiac and glands

2 functional subdivisions:

• Sympathetic
• Parasympathetic

Question 5

2 types of histology of nervous tissue?

Answer 5

1. Neurons- excitable cells that transmit electrical signals
2. Neuroglia (glial cells)- supporting cells
   - Astrocytes CNS
   - Microglia CNS
   - Ependymal cells CNS
   - Oligodendrocytes CNS
   - Satellite cells PNS

schwann cells PNS

Question 6

HISTOLGY of nervous tissue

Neuroglia glial cells

Astrocytes?

Answer 6

Must abundant, help determine capillary permeability, participate in information processing in the brain

Question 7

HISTOLOGY OF NERVOUS TISSUE

Neuroglial glial cells

Microglial??

Answer 7

small oviod cells with thorny process, migrate to injured neurons

Question 8

Neuroglial cells

Ependymal cells??

Answer 8

range in shape from squamous to columnar

line the central cavities of the brain and spinal column

-separate CNS interstitual fluid from CSF

Question 9

Neuroglial Cells

Oligodenrocytes??

Answer 9

• Branched cells
• processes wrap CNS nerve fibers forming insulating myelin sheaths

Question 10

Neuroglial Cells

Satellite and Schwann Cells??

Answer 10

1. Sattellite
   - surround neuron cell bodies in PNS
2. Schwann cells( neurolemmocytes)
   - surround peripheral nerve fibers and form myelin sheaths
   - vital to regeneration of damaged peripheral nerve fibers

Question 11

Neurons (nerve cells)

Answer 11

special characteristics -

-long lived

Amitotic

• High metobolic rate
• plasma membrane functions in:
  1. electrical sig
  2. cell to cell interactions during development