view-5.php - The Peripheral Nervous System Chapter 6 The...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
The Peripheral Nervous System Chapter 6
Background image of page 1

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

View Full DocumentRight Arrow Icon
The Peripheral Nervous System is divided into two divisions: The Afferent Division is also called the: Sensory Division Remember: A fferent signals are sent A t (towards) the CNS
Background image of page 2
The PNS nerve fibers carry information between the CNS and body regions . Its afferent division sends information about the external and internal environment to the CNS. That’s why it’s called the Sensory Division.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Sensory information comes in two forms. Visceral (or sub-conscious) like: Blood Pressure Temperature Blood oxygen levels Sensory (2 types) 1. Somatic (movement) (from 2 areas) A. Somesthetic (from skin) B. 2. Special Senses (taste, sight, sound, smell, etc.)
Background image of page 4
Types of Sensory Information VISCERAL afferent pathways convey subconscious information from the internal viscera. (Homeostasis) SENSORY information is conveyed to the level of conscious awareness. It is sensory afferent. SENSORY information can be either a somatic sensation from the skin or proprioception from the muscles, joints, skin, and inner ear. Special senses: vision, hearing, taste, smell & touch.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Perception is the conscious awareness of the external world. It is created by the brain from a pattern of nerve impulses sent to the brain from sensory receptors. The brain interprets an input. Human perceptions do not replicate reality.
Background image of page 6
Do you “see” a white square that is not really there?
Background image of page 7

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

View Full DocumentRight Arrow Icon
Figure 6.2 Page 186 Variable perceptions from the same visual input Do you see two faces in profile, or a wine glass?
Background image of page 8
How is the sensory information received? A stimulus alters the membrane permeability of the cells of a receptor. This leads to the production of a graded potential or generator potential. (It’s the same thing but it depends on the type of receptor)
Background image of page 9

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

View Full DocumentRight Arrow Icon
Physical stimuli is changed into electrical stimuli. The receptor “senses” some form of physical stimuli. This generates an action potential. Therefore the physical signal is converted into an electrical signal. The electrical signal is sent to the brain.
Background image of page 10
Types of Sensory Receptors The receptor can be a specialized ending of an afferent neuron. or A specialized cell closely associated with the peripheral ending of a neuron.
Background image of page 11

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

View Full DocumentRight Arrow Icon
Figure 6.3 (a) Page 188 Chemically gated channels Afferent neuron fiber Diffusion chemical messenger Receptor (separate cell )
Background image of page 12
Afferent neuron fiber Voltage-gated channels Receptor (separate cell)
Background image of page 13

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

View Full DocumentRight Arrow Icon
A stimulus produces a change in membrane permeability. This leads to the influx of sodium ions. This starts the depolarization process. This produces receptor
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/02/2010 for the course PHYSIO EXERCISE P taught by Professor Gil during the Spring '10 term at UCSB.

Page1 / 77

view-5.php - The Peripheral Nervous System Chapter 6 The...

This preview shows document pages 1 - 15. Sign up to view the full document.

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