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