Functions of Nervous system?
- Sensory Imput
- Integration
- Motor output
Divisions of the Nervous system?
- Central nervous system CNS
- brain + spinal (command center) - Peripheral nervous system PNS
- transmits impulses from CNS to effector organs
2 functional divisions of the PNS?
- Sensory (afferent) division-
- somatic afferent fibers- convey impulses from skin, skeletal muscles, joints
- visceral afferent fibers- convey impulses from visceral organs - Motor (efferent) division-
- transmits impulses from CNS to effector organs
Motor divisions of PNS?
- Somatic (voluntary)
- Autonomic (involuntary) nervous system- regulates smooth muscle, cardiac and glands
2 functional subdivisions:
- Sympathetic
- Parasympathetic
2 types of histology of nervous tissue?
- Neurons- excitable cells that transmit electrical signals
- Neuroglia (glial cells)- supporting cells
- Astrocytes CNS
- Microglia CNS
- Ependymal cells CNS
- Oligodendrocytes CNS
- Satellite cells PNS
schwann cells PNS
HISTOLGY of nervous tissue
Neuroglia glial cells
Astrocytes?
Must abundant, help determine capillary permeability, participate in information processing in the brain
HISTOLOGY OF NERVOUS TISSUE
Neuroglial glial cells
Microglial??
small oviod cells with thorny process, migrate to injured neurons
Neuroglial cells
Ependymal cells??
range in shape from squamous to columnar
line the central cavities of the brain and spinal column
-separate CNS interstitual fluid from CSF
Neuroglial Cells
Oligodenrocytes??
- Branched cells
- processes wrap CNS nerve fibers forming insulating myelin sheaths
Neuroglial Cells
Satellite and Schwann Cells??
- Sattellite
- surround neuron cell bodies in PNS - Schwann cells( neurolemmocytes)
- surround peripheral nerve fibers and form myelin sheaths
- vital to regeneration of damaged peripheral nerve fibers
Neurons (nerve cells)
special characteristics -
-long lived
Amitotic
- High metobolic rate
- plasma membrane functions in:
1. electrical sig
2. cell to cell interactions during development
