Ch 13: PNS
What is the route Encapsulated Pro-pri-ceptors travel? (position and movement)
- to cerebrum, - cerebellum - spinal reflex arcs
Pacinian Corpuscles
-Deep pressure -Subcutaeous layer of skin
Meissner's Corpuscles
-Discriminative touch and hairless skin areas -Dermis of skin
What is the difference between GENERAL senses and SPECIAL senses?
-GENERAL senses are those with receptors widely distributed throughout the body -SPECIAL senses are "specialized" receptors and are confined to structures in the head
Root Hair Plexus
-Light touch -Dermis of skin
Merkel's Discs
-Light touch and pressure -Basal layer of skin -Slow mechanoreceptors
nerve amage and repain in PNS SL 22
-Mature Neurons can be devided and still used -If the doma is still intatc a damaged axon will regenerate Involves coordinated activity among: - Macrophages—remove debris - Schwann cells—form regeneration tube and secrete growth factors - Axons—regenerate damaged part • CNS oligodendrocytes bear growth-inhibiting proteins that prevent CNS fiber regeneration
Free Nerve ending
-Pain and temp. -Epidermis of skin
Ruffini's Corpuscles
-Porprioception, Deep pressure and stretch - Dermis layer of skin
SL 15* Motor endings in the PNS are used for
-innervation of skeletal muscle (concious control) -innervation of visceral muscles and glands (autonomic function)
3 types of Peripheral sensory receptions:
1. Exteroceptors 2. Interoceptors 3.Proprioceptors
What are the three types of Unencapsulated nerve endings?
1. Free Nerve ending 2. Merkel's Discs 3. Root Hair Plexus
What are the 4 types of Encapsulated nerve endings?
1. Krause's End-Bulbs 2. Meissner's Corpuscles 3. Pacinian Corpuscles 4. Ruffini's Corpuscles
6 types of Sensory receptors
1. Mechanoreceptors 2. Thermoreceptors 3. Photoreceptors 4. Chemoreceptors 5. Nociceptors 6. Osmoreceptors
Which is afferent? (to CNS) A. Sensory Division B. Motor Division
A. Sensory Division
Spinal Nerves attach to... A. Spinal Cord B. Brain
A. Spinal Cord
Cranial Nerves attach to..... A. Spinal Cord B. Brain
B. Brain
Which is efferent? (from CNS) A. Sensory Division B. Motor Division
B. Motor Division
Describe: Somatic Sensory
Carries signals from skin, bones, joints, and muscles General: Senses; Touch, pain, pressure, vibration, temp., and proprioception the the skin body wall and limbs. Special: Hearing, equilibrium, vision & smell
What is the role of PNS?
Carry afferent sensory information to the CNS via nerves. Once information is coded, the CNS sends out the motor action via nerves in the PNS.
What nerves are a part of the PNS system?
Cranial and spinal Nerves
Krause's End-Bulbs
Discriminative Touch and mucous membrane
Sympathetic system is....
Fight our fright use a sward (both start with S)
Visceral Sensory
General: Stretch, pain temperature, Chemical changes, and irritation in viscera; nausea and hunger Special: taste
Encapsulated Nerve Endings
Have covering over the dendrite nerve endings
Unencapsulated Nerve Endings
Have no covering over the dendrite nerve endings
Deine visceral motor....
Involuntary Movements General: MotorInnovation of smooth muscle cardiac muscle and glands; Equivalent to ANS
Joint Kinesthetic receptors
Monitors stretch in synovial joints; sends info to cerebellum and spinal reflex arcs
3 types of Encapsulated Pro-pri-ceptors (position and movement)
Muscle Spindles Golgi Tendon Organs Joint Kinesthetic receptors
Note: Somatic = Skin and Skeletal (stats with S) Visceral= rhymes with internal
Note: Somatic = Skin and Skeletal (stats with S) Visceral= rhymes with internal
Osmo-receptors responsible for....
Osmotic pressure
Give an example of a general sense stimuli..
Pain,Temperature,Light touch,Pressure, body and limb position
PNS stands for:
Peripheral Nervous System
The role of motor neurons?
Relay information form the CNS -> PNS-> TARGET CELL; to then activate the ANS (Autonomic) which will then activate Parasympathetic or sympathetic based on the TARGET CELL
Muscle Spindles
Skeletal Muscle stretching
What type of Motor Division is a part of the PNS?
Somatic and Visceral motor
What's are the differences between somatic sensory visceral sensory?
Somatic neurons transmit information from the SKIN or SKELETAL muscles to the central nervous system while the visceral neurons transmit information from the INTERNAL ORGANS to the central nervous system
What type of sensory is a part of the afferent division of the PNS?
Somatic sensory Visceral sensory
Autonomic nervous system has 2 parts...
Sympathetic Parasympathetic
Give an example of a special sense stimuli..
Taste, Smell,Vision,Hearing,Balance
Therm-o-receptors responsible for....
Temperature
Golgi Tendon Organs
Tendon stretching
What are the commonalities between somatic sensory visceral sensory?
They send INFORMATION to the CNS and both have a unipolar shape.
Define somatic motor...
Voluntary Movements General: Motor innervation of all skeletal muscles (skeletal muscle cells are target cells)
Sensation is...
awareness stimuli, conscious or subconscious.
Chemo-receptors responsible for....
chemical
Photo-receptors responsible for....
light
Noci-ceptors responsible for....
pain
Visceral pain
pain in body organs
Somatic pain
pain in the skin, muscle, joints, and tendon
Parasympathetic system is....
rest and digest go on a picnic (both start with a P)
Define the PNS sensory receptor; Interoceptors...
stimuli from INSIDE the body
Define the PNS sensory receptor; Exteroceptors...
stimuli from OUTSIDE the body
Define the PNS sensory receptor; Proprioceptors...
stimuli from position and movement of the body (inside)
Perception is...
the awareness and interpretation of stimuli, conscious only.
Mech-an-o-receptors responsible for....
touch and sound
Referred pain
visceral pain is transmitted via the a motor neuron, that then triggers somatic pain ie. heart attack, arm is in pain
