Nervous Tissue

Nervous Tissue - NervousTissue Fundamentals of the Nervous...

Info iconThis preview shows pages 1–17. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Fundamentals of the Nervous System and Nervous Tissue P A R T A Nervous Tissue
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Nervous System ¡ The master controlling and  communicating system of the body ¡ Functions l Sensory input –the stimuli goes to  CNS  l Integration – interpretation of sensory  input l Motor output – response to stimuli  coming from CNS
Background image of page 2
3 Figure 11.1
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Organization of the Nervous System ¡ Central nervous system (CNS)  l Brain and spinal cord l Integration and command center  ¡ Peripheral nervous system (PNS) l Paired spinal and cranial nerves l Carries messages to and from the  spinal cord and brain
Background image of page 4
5 Peripheral Nervous System (PNS): Two Functional Divisions ¡ Sensory (afferent)  division l Somatic sensory  fibers – carry impulses  from skin, skeletal muscles, and joints to the  brain l Visceral sensory  fibers – transmit impulses  from visceral organs to the brain 
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Motor Division: Two Main Parts ¡ Motor (efferent)  division  l Somatic motor nervous system   (voluntary)- carries impulses from the  CNS to skeletal muscles. Conscious  control
Background image of page 6
7 Motor Division: Two Main Parts ¡ Visceral motor nervous system or  Autonomic nervous system (ANS)   (involuntary) -   carry impulses from the  CNS to smooth muscle, cardiac muscle,  and glands  l Sympathetic and  l Parasympathetic l Enteric Nervous System (ENS)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Histology of Nerve Tissue ¡ The two principal cell types of the  nervous system are: l Neurons  – excitable cells that transmit  electrical signals l Neuroglias (glial)  – cells that  surround and wrap neurons
Background image of page 8
9 Supporting Cells: Neuroglia ¡ Neuroglia l Provide a supportive scaffolding for  neurons l Segregate and insulate neurons l Guide young neurons to the proper  connections  l Promote health and growth
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 Neuroglia of the CNS ¡ Astrocytes ¡ Most abundant, versatile, and highly  branched glial cells ¡ Maintain blood-brain barrier ¡ They cling to neurons and their  synaptic endings,  ¡ They wrap around capillaries l Regulate their permeability 
Background image of page 10
11 Neuroglia of the CNS ¡ Provide structural framework for the  neuron ¡ Guide migration of young neurons ¡ Control the chemical environment ¡ Repair damaged neural tissue
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 Astrocytes Figure 11.3a
Background image of page 12
13 Neuroglia of the CNS ¡ Microglia  – small, ovoid cells with spiny  processes l Phagocytes that monitor the health of  neurons ¡ Ependymal cells  – range in shape from  squamous to columnar l They line the central cavities of the  brain and spinal column
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 Microglia and Ependymal Cells Figure 11.3b, c
Background image of page 14
15 Neuroglia of the CNS ¡ Oligodendrocytes  – branched cells  l Myelin ¡ Wraps of oligodendrocytes  processes around nerve fibers ¡ Insulates the nerve fibers
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
16 Neuroglia of the PNS ¡ Schwann cells  (neurolemmocytes) – l Myelin ¡ Wraps itself around nerve fibers
Background image of page 16
Image of page 17
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/06/2012 for the course BIOL 2401 taught by Professor Elainefanin during the Fall '11 term at Collins.

Page1 / 145

Nervous Tissue - NervousTissue Fundamentals of the Nervous...

This preview shows document pages 1 - 17. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online