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Flashcards in Autonomics Deck (26):
1

Autonomic Nervous System

Neural pathways by which the CNS controls smooth muscle/cardiac muscle/glandular secretions – is purely motor

2

Preganglion neuron

1st neuron from the initial signal, that is always in the CNS, axon synapses with spinal or cranial nerves

3

Postganglion neuron

2nd neuron, almost always in a ganglion, innervates the target tissue

4

Acetylcholine

Found in both sympathetic/parasympathetic preG Found in only the parasympathetic postG

5

Norepinephrine

Found in the sympathetic postG

6

Sympathetic

"fight or flight", function together to create widespread system mobilization

7

Sympathetic Preganglion nerves

Found in the lateral gray horns, usually short in length, all leave via ventral roots, always enter via the white rami, aka Thoracolumbar division

8

Sympathetic postganglion nerves

Long in length, reenter the spinal nerve via the gray rami if going to the limb

9

Cervical Sympathetic Chain Ganglion

PostGs that pass over the vertebral/carotid arteries to reach head/neck target organs

10

3 areas of sympathetic ganglion

Sympathetic trunk, pre-aortic ganglia, pelvic plexus

11

Sympathetic Trunk

25 interconnected ganglia adjacent to each side of the vertebral column, Only 3 in cervical

12

PreAortic Ganglia

3 found at the major abdominal arteries

13

Pelvic Plexus

1 paired set found adjacent to the rectum and vagina

14

Possible PreGanglion/PostGanglion synapsing

  1. Synapse on same level in trunk
  2. Synapse inferiorly/superiorly
  3. Enter/exit without synapsing, form separate nerves

15

Sympathetic nerves in the abdomen

Form into the splanchnic nerves without synapsing in the trunk, synapses with the preaortic or pelvis ganglia

16

Great thoracic splanchnic nerve

Emerges from T5-T9 area, synapses with celiac ganglion, postGs pass long the artery surface to reach the target organs

17

Parasympathetic 

"Rest and digest", restore/conserve energy, have more precise control over specific targets, act more slowly/gradually

18

Parasympathetic preganglionic neurons

Found in the brainstem and S2-S4, aka the craniosacral division

19

Parasympathetic postganglions

Usually found near the tissue they innervate

20

Cranial nerve III

  • Oculomotor
  • Controls pupil constriction/focus of the eye
  • Parasympathetic

21

Cranial nerve VII

  • Facial nerve
  • Controls lacrimal/muscosal/salivary gland secretion
  • parasympathetic

22

Cranial nerve IX

  • Glossopharyngeal
  • Control parotid salivary secretion
  • parasympathetic

23

Cranial Nerve X

  • Vagus nerve
  • Controls the heart and GI (via transverse colon), organs for thorax and abdomen
  • PreGs are in the motor nucleus of cranial nerve X
  • PostGs are terminal/intramural ganglion

24

Terminal/Intramural Ganglion

Ganglion that are close to or on the surface of the target organ

25

Visceral Afferents v. Visceral Sensory

Concious sensation (VS) so can feel pain/pressure

VA evokes reflexes, but are not felt

26

Referred pain

Due to visceral sensory organs traveling along the same nerve path as the somatic nerves, so any signals sent from the visceral sensory organs may be interpreted along the same dermatome