Anatomy & physiology. Part 1: The Nervous System. Three Functions of the Nervous System:. Sensory Input : Gathers stimuli (receives information) Integration : Processes and interprets information Motor Output : Causes a response to muscles or glands. http://www.google.com/imgres ?.
The Nervous System
to muscles or glands
1. Microglial cells:support neurons & carry out phagocytosis
2. Oligodendrocytes: form myelin within the brain; occur in rows along nerve fibers
3. Astrocytes: found between neurons & bv’s; support, regulate [nutrients] & [ions], & form scar tissue following a CNS injury.
4. Ependymal cells: membrane like structure that covers parts of the brain(choroid plexuses) & forms inner linings of brain (ventricles) & spinal cord(central canal).
a nucleus, &
is called the
Large axons have a covering sheath called a myelin sheath (a membrane of lipoprotein).
1. Bipolar neurons: 2 nerve fibers, one at each end (1 axon & 1 dendrite). Found in the nose, eyes, & ears.
2. Unipolar neurons: 1 nerve fiber from the cell body that has 2 branches (1 branch acts as a dendrite & the other branch acts as an axon).
3. Multipolar neurons: many nerve fibers, 1 axon and many dendrites. Found in the brain & spinal cord.
1. Sensory neurons: carry impulses from peripheral body parts to brain & spinal cord (from PNS to CNS). Most are unipolar, some bipolar.
2. Interneurons: carry impulses between neurons. Multipolar neurons.
3. Motor neurons: carry impulses from the brain & spinal cord to the effectors (muscles & glands outside of the NS) to carry out a response. Multipolar.