ANAPHY NUERO PART 2

Cutaneous sense organs

• in skin

• - detect pain, temperature, touch, pressure

Free nerve endings

pain and temperature receptors

Meissner’s corpuscle

touch receptor

Lamellar corpuscle

deep pressure receptor

Proprioceptors

• - in muscles and tendons

• - detect stretch

Sensory (afferent) neurons

Carry impulses from the sensory receptors to the CNS

Motor (efferent) neurons

Carry impulses from the central nervous system to viscera and/or muscles and glands

Interneurons (association neurons)

• Cell bodies located in the CNS

• - Connect sensory and motor neurons

Posterior region of spinal cord ( bell-magendie law )

responsible for sensory function

Anterior region of spinal cord ( bell-magendie law )

responsible for motor function

Multipolar neurons

• - many extensions from the cell body

• - All motor and interneurons are multipolar

• - Most common structural type

Bipolar neurons

• one axon and one dendrite

• - Located in special sense organs, such as nose and eye

• - Rare in adults

Unipolar neurons

• - have a short single process leaving the cell body

• - Sensory neurons found in PNS ganglia

• - Conduct impulses both toward and away from the cell body

Irritability

Ability to respond to a stimulus and convert it to a nerve impulse

Conductivity

Ability to transmit the impulse to other neurons, muscles, or glands

Transmission of an impulse is?

electrochemical

Transmission down neuron is?

electrical

Transmission to next neuron is?

chemical

All-or-none response

means the nerve impulse either is propagated or is not

graded potential (localized depolarization)

exists where the inside of the membrane is more positive and the outside is less positive

action potential (nerve impulse)

if the stimulus is strong enough and sodium influx great enough, local depolarization activates the neuron to conduct an