+
Related Flashcards
Cards In This Set
| Front | Back |
|
The CNS is made up of ...
|
The brain and spinal cord. (peripheral nervous system is basically everything else)
|
|
The spinal cord is made up of..
|
vertebrae; epidural space filled with fat; dura matter; CSF; pia matter
|
|
describe the gray matter of the spinal cord
|
shaped like the letter H or a butterfly; contains neuron cell bodies and unmyelinated axons/dendrites.
|
|
describe the white matter of the spinal cord
|
covers the gray matter
|
|
describe the function of the tracts of the spinal cord
|
sensory = ascending tracts and motor = descending tracts. they are a highway for sensory and motor information.
|
|
what are motor tracts?
|
descending tracts of the spinal cord.
|
|
what are sensory tracts?
|
ascending tracts of the spinal cord
|
|
what is the spinothalmic tract of the spinal cord?
|
a sensory tract; plays a part in pain, temperature, deep pressure recepting
|
|
what is the posterior columns tract?
|
a sensory tract; plays a part in discriminative touch, pressure and vibration recepting
|
|
what are the corticospinal and coricobulbar tracts?
|
direct motor tracts; for precise/voluntary movements
|
|
what are the rubrospinal and vestibulospinal tracts?
|
indirect motor tracts; automatic movements; posture and muscle tone
|
|
what is a reflex arc and what are its components?
|
an automatic response to change; a specific nerve impulse pathway. components:1. receptor2. sensory neuron3. integrating center4. motor neuron5. effector
|
|
describe stretch reflexes
|
ex: patellar reflex. brain sets muscle spindle sensitivity as it sets muscle tone
|
|
describe tendon reflexes
|
control muscle tension by causing muscle relaxation that prevents tendon damage. activated by stretching of tendon
|
|
how many spinal nerves are there?
|
31 pairs; named and #d by the cord level of origin.8 pairs of cervical nerves (from C1-C8)12 pairs of thoracic nerves (from T1-T12)5 pairs of sacral nerves (S1-S5)and 1 pair of coccygeal nerves
|
