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Anatomy Weekly Review > Intro To ANS > Flashcards

Intro To ANS Flashcards

1
Q

What do the sensory part of the ANS innervate

A

The viscera of organs

Poorly localised

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2
Q

What do the motor parts of the ANS innervate

A

Smooth muscle

Glands

Organs

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3
Q

Classification of motor parts of CNS

A

Sympathetic
-fight or flight

parasympathetic
- rest, digest, read

Enteric - SM of digestive trac

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4
Q

Sympathetic pathway

A

Short PREsynaptic neuron w/in CNS

-> synapses w/

Long POSTsynaptic neuron at the PARAVERTEBRAL ganglia outside CNS

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5
Q

Location of sympathetic nerves Aka thoracolumbar efferent/motor part of ANS

A

T1-L2

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6
Q

How do sympathetic signals travel bet/w T1 and L2 in SC

A

The sympathetic chain travels paravertebrally that joins the ganglia at each level of SC betw T1-L2 aswell as beyond these confines to exert a symoathetic effect to structures outside T1-L4

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7
Q

Whete can the short presynaptic sympathetic neuron synapse

A
  1. With a postganglionic cell body At the same level
  2. With a postganglionic cell body At a higher or lower vertrebral level to the presynaptic neuron
  3. Exit sympathetic chain without synapsing but synapsing later(SPLANCHNIC)
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8
Q

Explain splanchnic nerves

A

Presynaptic sympathetic neruons bypass the paravertebral ganglia (up and over) and descend to the aorta

The presynaptic neuron then synapses with PREAORTIC GANGLIA

The preaortic ganglia axon travels alongside blood vessels and reaches the viscera if internal organs

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9
Q

Why do we feel sleepy when reading

A

Constriction of the pupils activates the parasympathetic nervous system

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10
Q

Location of PNS

A

Cranio sacral

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11
Q

Cranial portion of PNS

A

CN3- ocular motor for pupil constriction

CN7/ facial

  • for digesting food via sublingual, submandibular and salivary glands
  • crying via lacrimal gland

CN9/ glossopharyngeal for parotid gland

Cn10/hypoglossal which travels furthest from the heart, and up to 2/3 of transverse colon

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12
Q

What are the sacral contributions to PNS

A

Pelvic splanchnic nerves from S2,3,4

Which innervates the rest of digestive tract

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13
Q

Pathway of PNS

A

Long presynaptic and short postsynaptic at the target organ

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14
Q

What js thr Enteric nervous system

A

Nerves embedded in hollow organs if digestive tract from oesophageal to rectum

Has 5x the nerves of the spinal cord

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15
Q

Function of enteric NS

A

Peristalsis

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16
Q

Which two plexuses make ip the enteric NS

A

Auerbach/myenteric- betw the LONGITUDINAL and CIRCULAR smooth muscle layers

Meisner/ submucosal- found in the mucous lining of the organs

The two plexuses communicate to regular contractions

Anatomy Weekly Review (8 decks)

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