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Comprehensive Anatomy & Physiology > Nervous System: PNS > Flashcards

Nervous System: PNS Flashcards

1
Q

Cauda Equina

A

Nerve starting at lower end of SC and its spinal nerves

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2
Q

Spinal Nerve

A
  • Made up of a ventral & dorsal root
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3
Q

Ventral Root

A

Contains only MOTOR neurons (from SC)

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4
Q

Dorsal Root

A

Contains only SENSORY neurons (to SC)

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5
Q

Spinal nerves split into what?

A

Rami (Ramus)

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6
Q

Dorsal Ramus

A
  • Goes projects to back of body

- Collects info from muscles/skin, sends info to muscles/skin

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7
Q

Ventral Ramus

A
  • Projects to front of body

- Connect to muscles & glands

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8
Q

Ganglion

A

Sensory neuron cell bodies

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9
Q

Nerve Plexus: What is it?

A

Group of nerves travelling to/from same direction

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10
Q

Nerve Plexus: Types

A
  • Cervical Plexus
  • Brachial Plexus
  • Lumbar Plexus
  • Sacral Plexus
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11
Q

Cervical Plexus

A

Innervate muscle/skin of neck, upper shoulders

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12
Q

Brachial Plexus

A

Innervate entire arm

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13
Q

Lumbar Plexus

A

Innervate thigh/leg via femoral nerve

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14
Q

Sacral Plexus

A

Innervate skin of leg/foot

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15
Q

Phrenic Nerves: R & L

A
  • Comes from cervical plexus

- Important in controlling diaphragm

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16
Q

Dermatomes (skin) good to determine SC injury

A
  • Sensory neurons (project into SC)
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17
Q

Myotomes (muscle)

A
  • Motor neurons (come from SC via ventral root)
18
Q

Divisions of PNS: Direction of Flow

A
  • Afferent (sensory)

- Efferent (motor)

19
Q

Divisions of PNS: Somatic and Automonic

A

Somatic: project to skeletal muscles (voluntary)

Autonomic: projection to periphery (involuntary)

20
Q

Reflex

A
  • Action that results from impule through reflex arc, leads to predictable response (muscle contraction or glandular secretion); subconscious
21
Q

Classification of Reflex Arc: Number of Neurons

A
  • 2 neuron reflex arc: 1 sensory, 1 motor neuron

- 3 neuron reflex arc: 1 sensory, 1 interneuron, 1 motor

22
Q

Classification of Reflex Arc: Location of processing center

A
  • Cranial: Processing center in brain

- Spinal: Into SC and out of SC

23
Q

Classification of Reflex Arc: Effector Tissue (where motor/efferent neurons project to)

A
  • Somatic: contraction of skeletal muscle

- Autonomic: contraction of smooth/cardiac muscle

24
Q

Contralateral Reflex Arc

A

Receptors on different sides of body

25
Q

Ipsilateral Reflex Arc

A

Receptors on same side of body

26
Q

Cranial Nerves: How many?

A

12

27
Q

Olfactory Nerve (I)

A

SENSORY; receives info from nasal mucosa

28
Q

Optic Nerve (II)

A

SENSORY; info. from retinal neurons; proprioception (awareness of body position)

29
Q

Oculomotor Nerve (III)

A

MOTOR; Controls eye muscles; autonomic fibers regulate amoung of light entering eye

30
Q

Trochlear Nerve (IV)

A

MOTOR; superior oblique (eye)

31
Q

Trigeminal Nerva (V)

A

MIXED; sensory: input from skin and mucosa of head and teeth

motor: chewing/jaw move

32
Q

Abducens Nerve (VI)

A

MOTOR; lateral rectus (eye)

33
Q

Facial Nerve (VII)

A

MIXED

motor: muscles of face and scalp
sensory: taste senstaion

34
Q

Vestibulocochlear Nerve (VIII)

A

SENSORY

receives input about hearing and equilibrium

35
Q

Glossopharyngeal Nerve (IX)

A

MIXED

Sensory: gets sensation from tongue and pharynx

Motor: projects to tongue/ sinus/ pharynx

36
Q

Vagus Nerve (X)

A

MIXED - main nerve of parasymp. NS

Sensory: input from pharynx, larynx, cardiac, lungs, GI tract
Motor: sends out to cardio, lungs, GI.

*Regulates heart, resps, digestion

37
Q

Accessory Nerve (XI)

A

MOTOR; proprioceptor input, controls head and shoulder movement

38
Q

Hypoglossal Nerve (XII)

A

MOTOR

Controls tongue

39
Q

Nerve Order Mem

A

On Old Olympus’ Tiny Tops, A Friendly Viking Grew Vines And Hops

40
Q

Sens/Motor/Both Mem

A

Some Say Marry Money, But My Brothers Say Bad Business, Marry Money

Comprehensive Anatomy & Physiology (7 decks)

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