Lab 9: Nervous System I Flashcards

1
Q

List the layers of the meninges in order from most superficial to most deep

A

1) Dura mater
2) Arachnoid mater
3) Pia mater

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2
Q

The empty space between the pia and arachnoid mater is called what?

A

The subarachnoid space

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3
Q

What is the function of the subarachnoid space?

A

To circulate CSF (cerebrospinal fluid)

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4
Q

Name the 4 plexuses and where they’re located

A

1) Cervical: C1-5
2) Brachial: C5-T1
3) Lumbar: L1-4
4) Sacral: L4-S4

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5
Q

What nerve is a part of the cervical plexus?

A

Phrenic nerve

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6
Q

What 4 nerves are a part of the brachial plexus?

A

Axillary
Radial
Median
Ulnar

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7
Q

What 2 nerves are a part of the lumbar plexus?

A

Femoral and obturator

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8
Q

What 2 nerves are a part of the sacral plexus?

A

Sciatic and pudenal

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9
Q

What muscle does the phrenic nerve act on, and what does that muscle do?

A

The diaphragm, the contraction of which causes inhalation

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10
Q

What 2 muscles are innervated by the axillary nerve, and what do they do?

A

1) Deltoid: abduction of the arm

2) Teres minor: rotates the humerus laterally

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11
Q

What nerve is known to be very short?

A

The axillary nerve

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12
Q

What nerve is located on the posterior arm?

A

The radial nerve

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13
Q

What nerve is located on the middle of the forearm?

A

Median nerve

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14
Q

What 5 muscles are innervated by the radial nerve, and what do they do?

A

1) Triceps brachii: extension of the forearm
2-5) Extensor carpi radialis brevis, extensor carpi radialis lungs, extensor carpi ulnaris, and extensor digitorum: extension of the wrist

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15
Q

What 4 muscles are innervated by the median nerve, and what do they do? (hint: one muscle serves 2 functions)

A

1-3) Flexor carpi radialis, palmaris longus, and flexor digitorum: flexion of the wrist

3) Flexor digitorum: flexion of the fingers
4) Pronator teres: pronation

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16
Q

What muscle is innervated by the ulnar nerve, and what does it do?

A

Flexor carpi ulnaris: flexion of the wrist

17
Q

What 5 muscles are innervated by the femoral nerve, and what do they do? (hint: one muscle has 2 functions)

A

1-4) Vastus lateralis, vastus medius, vastus intermedius, and rectus femoris: extension of the knee

4) Rectus femoris: flexion of the hip
5) Sartorius: flexus, abducts, and laterally rotates the hip

18
Q

What 3 muscles are innervated by the obturator nerve, and what is their function?

A

Gracilis, adductor longus, and adductor magnus: adduction of the hip

19
Q

What nerve travels the anterior thigh?

A

Femoral nerve

20
Q

What nerve innervates only adductors?

A

Obturator nerve

21
Q

What nerve travels down the posterior thigh?

A

Sciatic nerve

22
Q

What nerve is best described as short and located in the pelvis?

A

Pudenal nerve

23
Q

What 3 muscles are innervated by the sciatic nerve, and what are their functions?

A

Biceps femoris, semitendinosus, and semimembranosus: extension of the hip and flexion of the knee

24
Q

What 2 muscles are innervated by the pudenal nerve, and what do they do?

A

1) External urethral sphincter: voluntary control of urination
2) External anal sphincter: voluntary control of defecation

25
Q

What plexuses innervate the torso and above?

A

Cervical and brachial