Nervous Tissue - Anat

Front 1

Nervous Tissue develops from what?

Back 1

Ectoderm

Front 2

Nervous Tissue functions (4)?

Back 2

1. detect and analyze sensory input
2. coordinate body activities
3. store experiences
4. learning and memory

Front 3

Two parts of the nervous system?

Back 3

1. Peripheral nervous system (PNS) including: spinal, cranial and autonomic nerves
2. Central nervous system (CNS) including: brain, brain stem and spinal cord

Front 4

CNS coverings (3)

Back 4

1. Pia mater - innermost layer - vascular layer that carries blood vessels into CNS
2. Arachnoid - intermediate layer - layer of loose CT that is involved in CSF circulation
3. Dura mater - outermost layer - dense CT that protects the CNS against mechanical trauma

Front 5

Nervous Tissue: two types

Back 5

1. gray matter (nerve cells)
2. white matter (mostly nerve fibers)

Front 6

Cell types (2)

Back 6

1. Neurons - excitable cells that carry out information transfer (neuro-transmission)
2. Glia - non-excitable cells of different origins that enhance efficiency of transmission (such as astrocytes, oligodendroyte and microglia)

Front 7

Fiber types (2)

Back 7

1. Myelinated
2. Unmyelinated

Front 8

Neuron is composed of the following parts:

Back 8

1. Soma (cell body or perikaryon)
2. Dendrites (receptive region)
3. Axon (conductive region)
4. Axon Terminal (synaptic ending)

Front 9

Classification of neurons

Back 9

multipolar, bipolar, and (pseudo) unipolar

Front 10

Perikaryon is the trophic center of the cell and contains:

Back 10

-Nucleus, prominent nucleolus
-Cytoplasm: cytoskeleton, organelles, Golgi apparatus, mitochondria and Nissl substance

Front 11

What is Nissl substance?

Back 11

Clusters of densely packed ribosomes and mRNA

Front 12

What is a dendrite?

Back 12

The receptive region of the cell that conducts impulses towards cell body

Front 13

Contents of a dendrite

Back 13

mitochondria, smooth ER, microtubules and neurofilaments but LACKS Golgi

Front 14

Axon

Back 14

Conductive region of the cell that sends impulses away from cell body
(Neurons always only have ONE axon)

Front 15

Contents of an axon

Back 15

mitochondria, SER (but no RER), and microtubules which are involved in axonal transport

Front 16

Axon Terminal

Back 16

-Is the end part of the axon that delivers the message to the next cell
-It is recognized by presence of lots of secretory vesicles (NTs) and mitochondria

Front 17

The three parts of a synapse

Back 17

1. pre-synaptic terminal (delivers NT)
2. synaptic cleft (intercellular space - contains enzymes)
3. post-synaptic membrane (receives NT)