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Advanced anesthesia 2 > Peripheral nerve anatomy > Flashcards

Peripheral nerve anatomy Flashcards

1
Q

3 branches of the trigeminal nerve (CN5)

A
  • opthalamic
  • maxillary
  • mandibular
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2
Q

what does the glossopharyngeal nerve innervate

A
  • oropharynx
  • soft palate
  • posterior 1/3 of tongue
  • pharyngeal surface of epiglottis
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3
Q

SLN innervation

A
  • base of tongue
  • posterior surface of epiglottis
  • aryepiglottic fold
  • arytenoids
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4
Q

where does the SLN arise from and divide into (pathway)

A
  • arises inferior ganglion of vagus nerve and descends behind the internal carotid at level of the hyoid bone and divides into the external and internal branches
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5
Q

external branch of SLN supplies what

A
  • cricothyroid muscle
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6
Q

internal branch of SLN supplies what

A
  • supplies sensory innervation to the larynx and hypopharynx
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7
Q

RLN innervates what

A
  • vocal folds and trachea
  • bilateral damage = resp distress
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8
Q

cervical plexus innervates what and is located where

A
  • muscles, joints and skin in the anterior neck
  • located in ventral rami C1-C4
  • lies under sternocleidomastoid muscle
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9
Q

what is the brachial plexus composed of

A
  • 5 ventral rami roots
  • 3 trunks
  • 6 divisions
  • 3 cords
  • 5 branches
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10
Q

where are the roots, trunks, and divisions of brachial plexus located

A
  • supraclavicular
  • posterior triangle of neck
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11
Q

where are the cords and branches of the brachial plexus located

A
  • infraclavicular
  • in axilla
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12
Q

location of the 5 roots of brachial plexus

A
  • C5-T1
  • from lateral foramina to lateral border of scalene muscles
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13
Q

which roots converge to make the 3 trunks of brachial plexus

A
  • superior trunk C5-C6
  • middle trunk C7
  • inferior trunk C8-T1
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14
Q

location of brachial plexus trunks

A
  • emerge between anterior and middle scalene muscles
  • enveloped in facial sheath
  • injection into sheath produces block
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15
Q

what do the 3 ventral divisions of brachial plexus supply

A
  • flexor portions
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16
Q

what do the 3 dorsal divisions of brachial plexus supply

A
  • extensor portions
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17
Q

in the axilla the 3 dorsal divisions combine to form what

A
  • the posterior cord
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18
Q

in the axilla the 3 ventral divisions combine to form what

A
  • the lateral and medial cords
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19
Q

major nerves that branch off of the lateral cord

A
  • musculocutaneous nerve
  • median nerve
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20
Q

major nerves that branch off of the medial cord

A
  • medial nerve
  • ulnar nerve
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21
Q

major nerves that branch off of the posterior cord

A
  • axillary nerve
  • radial nerve
22
Q

where is the axillary nerve formed and what does it innervate

A
  • formed C5-C6
    -innervates the shoulder (deltoid area)
23
Q

where is the redial nerve formed and what does it innervate

A
  • formed from C5-T1
  • innervates triceps, posterior surface of the forearm, hand, thumb, index, middle, and ring finger
24
Q

radial nerve response to stimulation

A
  • wrist extension
  • metacarpo-phalangeal extension
  • thumb abduction
25
Q

where is the musculocutaneous nerve formed and what does it innervate

A
  • formed from C5-C7
  • innervates muscles of brachialis and biceps
  • innervates skin of elbow and proximal radioulnar joints, lateral forearm (thumb side)
26
Q

motor response from musculocutaneous nerve

A
  • bicep flexion
27
Q

where is the median nerve formed and what does it innervate

A
  • from C5-T1
  • innervates anterior wrist and distal forearm, the thumb, index and lateral half of ring finger and their nail beds
28
Q

motor response to median nerve

A
  • wrist flexion
  • finger flexion
  • thumb opposition
29
Q

what are the branches of the medial nerve and where are they formed from

A
  • T1
  • medial brachial cutaneous branch
  • medial antebrachial cutaneous branch
30
Q

what does the medial brachial cutaneous branch innervate

A
  • innervates skin on medial surface of the arm (bicep area)
31
Q

what does the medial antebrachial cutaneous branch innervate

A
  • innervates the skin on the medial aspect of the forearm
32
Q

where is the ulnar nerve formed and what does it innervate

A
  • from C8-T1
  • lateral hand innervation, lateral ring finger and the little finger
33
Q

what does ulnar motor stimulation cause

A
  • ulnar deviation of the wrist
  • metacarpo-phalangeal flexion
  • thumb adduction
34
Q

what is the lumbosacral plexus formed from and what does it innervate

A
  • formed from L1-S5
  • innervates lower abdomen and lower extremities
35
Q

iliohypogastric nerve is formed from what and innervates what

A
  • formed from T12-L1
  • innervates parietal peritoneum and inferior abdomen and buttocks
36
Q

ilioinguinal nerve is formed from what and innervates what

A
  • formed from T12-L1
  • parietal peritoneum, superior and medial thigh, and portion of external genitalia
37
Q

genitofemoral nerve is formed by what and innervates what

A
  • formed by L1-L2
  • innervates skin over femoral hiatus, scrotum or labia
38
Q

pudendal nerve is formed from what and innervates what

A
  • formed from S2-S4
  • innervates skin and muscle of the perineum
39
Q

lateral femoral cutaneous nerve is formed from what and innervates what

A
  • formed from L2-L3
  • innervates lateral aspect of the thigh to knee
40
Q

posterior femoral cutaneous nerve is formed by what and innervates what

A
  • formed by S1-S3
  • innervates posterior thigh from hip to mid calf
41
Q

obturator nerve is formed by what and innervates what

A
  • formed from L2- L4
  • innervates controls muscles of the hip (ab and adductors) and medial thigh
42
Q

femoral nerve is formed by what and innervates what

A
  • formed from L2-L4
  • innervates anterior thigh and major thigh muscles (rectus, vastus, sartorious)
43
Q

what is the position of the femoral nerve

A
  • at femoral crease the nerve is lateral to fem artery and vein
  • lateral to medial = (NAVEL) nerve, artery, vein, empty space, ligament
44
Q

saphenous nerve is a branch of what and innervates what

A
  • branch of the femoral nerve
  • innervates medial leg from knee to foot
45
Q

stimulation of the saphenous nerve causes what

A
  • sartorious contraction (bandlike across thigh) and patellar twitch
46
Q

sciatic nerve is formed by what and innervates what

A
  • formed by junction of the tibial nerve and the common peroneal nerve
  • innervates hip extension and flexion of the knee
47
Q

tibial nerve is formed by what and innervates what

A
  • formed by anterior division of L4-S3
  • branches into planter nerves and innervates planter surface of the foot
48
Q

sural nerve is formed from what and innervates what

A
  • formed from union of tibial and common peroneal nerve
  • innervates sole of foot, posterior heel, and achilles tendon
49
Q

motor response to tibial nerve

A
  • plantar flexion of foot and toes
  • inversion of foot
50
Q

motor response to superficial peroneal nerve

A
  • abduction of foot
  • eversion of foot

Advanced anesthesia 2 (10 decks)

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