Ch 15 Sensory pathways and the somatic nervous system Flashcards
(49 cards)
Sensory neurons that are always active are called ________ receptors.
tonic
Your uncle was just diagnosed with a heart attack. One of his major symptoms is left arm pain. You are not surprised because you are familiar with the phenomenon of ________ pain.
reffered
Sensory neurons that adapt quickly are called ________ receptors.
phasic
Which motor pathway does not end in the spinal cord?
corticobulbar tract
For the last few weeks, you have had an odd sensation on your upper thigh. When you touch the naked skin, it feels very strange, like you are touching your skin through layers of cloth. The surrounding area feels normal. Your doctor thinks that this may be related to spinal nerve damage related to a herniated disc. The doctor calls this change in sensation
paresthesia
Which neuron delivers sensations to the CNS?
first order
Mechanoreceptors that respond to changes in blood pressure are called
baroreceptors
Pain is to ________ as cold is to ________.
nociceptors : thermoreceptors
The descending spinal tract that crosses to the opposite side of the body within the medulla oblongata is the ________ tract.
lateral corticospinal
A very large, fast-adapting tactile receptor that is composed of a single dendrite enclosed by concentric layers of collagen is a
lateral corpuscle
Central adaptation refers to
inhibition of nuclei located along a sensory pathway
The spinal tract that relays information concerning crude touch and pressure to the CNS is the
anterior spinothalamic
________ are receptors in the aorta that monitor the blood pressure.
baroreceptors
Activity of neurons in the spinothalamic pathway may still send signals even if the first order sensory receptor does not receive a signal such as in amputation. This situation might cause
phantom limb pain
Your brain is not constantly bombarded with signals telling it that you are wearing socks. This is because the touch receptors around your ankle are
phasic receptors and fast adapting
Receptors that monitor the position of joints belong to the category called
proprioceptors
A reduction in sensitivity in the presence of a constant stimulus is referred to as
adaptation
Bladder fullness is to ________ as blood pH is to ________.
baroreceptors : chemoreceptors
A tactile receptor composed of highly coiled dendrites that are surrounded by modified Schwann cells and a fibrous capsule is a
tactile corpuscle
Damage to the tectospinal tracts would interfere with the ability to
make reflex responses of the head and neck in response to sudden movement and loud noises
Some neurons within the basal nuclei are known to
inhibit neurons with GABA and and stimulate neurons with acetylcholine
Thalamic neurons that project to the primary sensory cortex are ________ neurons.
third order
Chemoreceptors of the general senses do not send information to the primary sensory cortex but instead send information to the ________ to control autonomic function.
brain stem
free nerve endings
pain and temp
