201 L4 Flashcards
Histology
What tissue interacts with all tissues and organs in the body?
Nervous tissue
What tissue is the primary component of the PNS and CNS?
Nervous tissue
———– tissue is responsible for ———- and ———– control of most of the body functions.
Nervous tissue is responsible for voluntary and involuntary control of most of the body functions.
Is nervous tissue vascularised?
Yes - highly
What tissue is specialised for signalling and integration and transmission of information?
Nervous tissue
In the —— staining technique only ——- and —— are stained.
Using this technique it was clear that —— are cells.
In the silver staining technique only neurons and glia are stained.
Using this technique it was clear that neurons are cells.
——- branches project out at 90 degrees, while ——— branch at a variety of angles.
Axons branches project out at 90 degrees, while dendrites branch at a variety of angles.
What did the silver staining technique not show?
How the information was transmitted between the neurons
How is information transmitted in neurons?
Through synaptic terminals
Name the glia cells in the CNS and PNS
Astrocytes Oligodendrocytes Microglia Schwann cells Satellite glial cells Ependymal cells Tanycytes Radial glia
Name the glia cell described below:
Influence the activity of neurons, contribute to the maintenance of ionic and transmitter metabolism and a role in repair.
Astrocytes
Name the glia cell described below:
Form the myelin sheaths of axons in the CNS. There are also non-myelinating types of these cells.
Oligodendrocytes
Name the glia cell described below:
Are the smallest glia cells and are part of the phagocytic system.
Microglia
Name the glia cell described below:
They are found in the PNS where they are responsible for the myelination of peripheral nerves.
They can also surround peripheral axons without forming a myelin sheath
Schwann cells
Name the glia cell described below:
These are found in the peripheral ganglia forming ‘baskets’ around the soma
of the ganglion cells.
Satellite glial cells
Name the glia cell described below:
Line the ventricular surface of the brain and central canal of the spinal cord.
Ependymal cells
Name the glia cell described below:
Connects the fluid in the ventricle with the endothelium of the capillaries
Tanycytes
Name the glia cell described below:
Connects the ventricular system in the brain with the outside surface of the brain
Help neurons find their final position during their development
Generate new neurons in adult brain
Radial glia
What is the role of the ECM in nervous tissue?
Tts role is not well understood.
It may be involved in the stabilisation of connections
between neurons and in the closure of sensitive periods of learning
Helps neurons navigate and migrate
Neurons organise themselves in the CNS in 3 distinct histological arrangements. What are their names?
Corticies
Nuclei
Reticular fomrations
What histological arrangment of the neurons is described below?
Around the outside of the brain the cells are organised into defined ———-.
Each layer performs a specific ——–.
The layers are ——– or —— depending on the main ——- or the ——–.
Cortices
Around the outside of the brain the cells are organised into defined layers.
Each layer performs a specific function.
The layers are expanded or shrunk depending on the main function or the area.
What histological arrangment of the neurons is described below?
When there are organised clumps of ——–.
In the PNS there are no —— but there are —– of cells called ———.
Nuclei
When there are organised clumps of neurons.
In the PNS there are no cortices but there are clumps of cells called ganglia.
What histological arrangment of the neurons is described below?
This is when ——- are not arranged in —— or ——.
Reticular system
This is when neurons are not arranged in cortices or nuclei.
Name 4 structure in the brain that have cortical organisation of cells.
Dorsal horn of the spinal cord
Hippocampus
Cerebellum
Forebrain (only in mammals)
