Lecture 6: Nervous Tissue Flashcards
Nervous tissue is specialised for ___ communication; and for ___ in direct support of communication?
Communication, secretion.
What are the two attributes of the nervous system?
- Irritability
- Conductivity
What function do neurons have?
Secretion.
What body parts make up the central nervous system and what characteristics does this matter have?
Consists of the brain and spinal chord. Made up of both grey and white matter.
What are the two types of nerves of the peripheral nervous system?
- Sensory (afferent) nerves
- Motor (efferent) nerves
What structure is responsive to stimuli, capable of responding?
Neurons.
Why can’t neurons divide?
They are highly differentiated.
How long is the lifespan of a neuron?
Neurons are formed in early life and they are functional until death.
___ carry information away from the soma, while ___ carry information into the soma.
Axons, dendrites.
Where are the specialised Glial cells in supporting cells within the nervous system?
In close association with neurons and blood vessels.
Astrocytes, satellite cells, oligodendrocytes, microglia and ependymal cells are all associated with what system?
The central nervous system.
Schwann cells are associated with what system?
The peripheral nervous system.
What is the function of Neuroglia?
Involved in homeostasis but do not convey electrical impulses.
What are astrocytes, and what are their function?
Stellate cells that surround about 99% of brain capillary surface area. Their function is to form a blood-brain barrier and in the maintenance of ion balance and transmitter metabolism (satellite cells play similar role in CNS).
Oligodendrocytes are specialised cells with ___ processes that wrap around axons in the ___.
Branching, CNS.
