+ All Categories
Home > Documents > 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

Date post: 23-Dec-2015
Category:
Upload: alexander-brown
View: 224 times
Download: 0 times
Share this document with a friend
Popular Tags:
13
4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information
Transcript
Page 1: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

4.4 Nervous Tissue* L: brain, spinal cord, nerves* F: transmit information

Page 2: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

A. Neurons* conduct nerve (electrical) impulses * 3 parts: dendrites – short, collect signals cell body – main part, contains nucleus axon – long, passes on nerve impulses

Page 3: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

B. Neuroglia (glial cells) * do not conduct nerve impulses * support, protect, and nourish neurons

Page 4: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

inside brain:microglia – support neurons, engulf bacteriaastrocytes – provide nutrients to neuronsoligodendrocytes – form myelin (insulation)

Page 5: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

* outside brain/spinal cord: Schwann cells - surround long axons gaps between cells = nodes of Ranvier produce myelin sheath (covering)

Node h of

Ranvier

Page 6: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 7: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 8: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 9: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 10: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 11: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 12: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.
Page 13: 4.4 Nervous Tissue * L: brain, spinal cord, nerves * F: transmit information.

Recommended