1-Nervous tissue (1&2)

What r the three basic functions of the N.S?

1.sensing changes with sensory receptors

2.interpreting and remembering those changes

3.reacting to those changes with effectors

Major Structures of the Nervous System:

• Brain

• Spinal cord

• Cranial nerves

• Spinal nerves

• Enteric plexuses

• Sensory receptors

Subdivisions of the Nervous System:

1. Central nervous system.

2. Peripheral nervous system:

a. Somatic nervous system.

b. Autonomic nervous system.

c. Enteric nervous system.

White matter is (myelinated or unmyelinated)?

myelinated

What is the body of neurons called?

Soma or Perikaryon

Purkinje cell

Pyramidal cell

What are nissl bodies in neurons?

Endoplasmic reticul`um

What cells form blood-brain barrier? +how?

Astrocytes by covering the blood capillaries

What cell provides structural support?

Astrocytes

What is the most common glial cell type?

Oligodendrocytes

How many axons do oligodendrocytes myelinate?

More than one axon

Phgocytic glial cells

Microglia

How many axons are myelnated by Schwann cells?

Only One

functions of myelinated:

1. Insulate the axons

2. Increased speed of nerve impulses

are areas of the myelinated axon that are not covered by the myelin sheath

Nodes of ranvier

Which part of the axon are ion channels concentrated?

Nodes of ranvier

Are small diameter axons myelinated?

NO