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Z-Anatomy 4 > Weel 8 handout answers > Flashcards

Weel 8 handout answers Flashcards

1
Q

From where in the spinal cord do cell bodies of sympathetic neurons arise?

A

lateral horn

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2
Q

Sympathetic neurons arise from which spinal segments?

A

T1-L2

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3
Q

What are the two branches of the mixed spinal nerve and what do they innervate?

A
  1. dorsal ramus 2. ventral ramus
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4
Q

What are the two divisions of the sympathetic rami communicantes?

A
  1. white rami = preganglionic 2. gray rami = postganglionic
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5
Q

Which sympathetic rami communicantes are myelinated?

A

white rami

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6
Q

Which sympathetic rami communicantes are unmyelinated?

A

grey rami

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7
Q

Which sympathetic rami communicantes enter the sympathetic paravertebral ganglion?

A

white rami

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8
Q

Which sympathetic rami communicantes leaves the sympathetic paravertebral ganglion to rejoin the spinal nerve?

A

grey rami

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9
Q

Why are there 8 cervical spinal nerves when there are only seven cervical vertebrae?

A

C7exits above C7, T1 exits below T1, therefore C8 exits below C7

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10
Q

The ventral rami of T1-T12 spinal nerves are known as?

A

intercostal nerves

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11
Q

The most important nerve of the cervical plexus is?

A

phrenic nerve

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12
Q

What are the five major branches of the brachial plexus?

A
  1. axillary 2. radial 3. ulnar 4. median 5. musculocutaneous
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13
Q

Name the 2 major nerves of the lumbar plexus?

A
  1. femoral 2. obturator
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14
Q

What is the major nerve of the sacral plexus?

A

sciatic nerve

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15
Q

2 components of sciatic nerve

A

tibial and peroneal

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16
Q

Which spinal nerve doesn’t participate in dermatomes?

A

C1

17
Q
  1. What are the three levels of motor control?
A
  1. segmental 2. projection 3. pre-command
18
Q

What are the five components of any reflex arc?

A
  1. receptor 2. afferent neuron 3. integration center (CNS) 4. efferent neuron 5. effector
19
Q

What is the muscle spindle and what is its role in the stretch reflex?

A

muscle stretch receptor prevents overstretching by activating stretched muscle and inhibiting antagonist

20
Q
  1. What is the Golgi tendon organ and what is its role in the Golgi tendon reflex?
A

muscle contraction receptors prevent overcontraction by inhibiting contracting muscle and activating antagonist

21
Q
  1. What happens during the flexor reflex?
A

automatic withdrawal (flexion) of the body part (limb)

22
Q
  1. What happens during the crossed extensor reflex?
A
  1. stimulated side is withdrawn (flexion) and 2. contralateral side extended
23
Q
  1. What is the difference between the plantar reflex and the Babinski sign?
A

Babinski = hallux extension ONLY; other plantar reflexes: 1. flexor 2. equivocal

Z-Anatomy 4 (14 decks)

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