Chpt. 14: Nervous System (PNS)

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/7

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

8 Terms

1
New cards

describe sensory pathway

3 neurons involved

  • receptors → 1/2/3 order neurons → thalamus → somasensory cortex

2
New cards

ascending pathways (sensory)

1) dorsal column
2) spinothalamic tracts

3
New cards

what is the dorsal column

  • starts at dorsal root

  • transmits somatic sensory signal

    • 1st order: spinal cord/medulla gray matter

    • 2nd order: medulla/midbrain gray matter

    • 3rd order: thalaus/somasensory cortex, white matter

4
New cards

what is the spinothalamic tract

  • right side after spinal cord

  • transit pain

    • 1st order: root ganglion, white matter

    • 2nd order: medulla/midbrain white matter

    • 3rd order: white matter cerebrum

5
New cards

describe motor pathway

2 neurons involved

  • motor cortex → spinal cord → skeletal muscle

6
New cards

descending pathways (motor)

1) corticospinal tract

7
New cards

what is the corticospinal tract

  • both sides, white matter only

  • leaves through ventral root of spinal cord

    • gray matter once

8
New cards

define nerve plexus

network of nerves

  • muscles of extremities (lumbar, cervical)

  • for safety

    • cervical/lumbar enlargement