(finalprep) MAJOR PERIPHERAL NERVES

Question 1

the CERVICAL PLEXUS consists of which major peripheral nerves?

Answer 1

1. phrenic nerve

2. ansa cervicalis

Question 2

the CERVICAL PLEXUS originates from

Answer 2

anterior rami of C1 - C5

Question 3

phrenic nerve

Answer 3

C3, C4, C5

function: keeps the diaphragm alive
injury: respiratory arrest

Question 4

ansa cervicalis

Answer 4

C1-C3

function: stabilize hyoid bone and larynx during speech and swallowing
injury:

Question 5

the BRACHIAL PLEXUS consists of which major peripheral nerves?

Answer 5

1. radial
2. median
3. ulnar
4. long thoracic

Question 6

the BRACHIAL PLEXUS originates from

Answer 6

anterior rami of C5 - T1

Question 7

median nerve

Answer 7

C6-T1

function: MAJOR FLEXORS OF WRIST (thumb, wrist + lateral fingers flexion, wrist abduction, finger tips)
injury: carpal tunnel syndrome

Cause: tendinitis of flexor retinaculum from overuse&raquo_space;leads to median nerve entrapment

Question 8

ulnar nerve

Answer 8

C7-T1

sensory: posterio-medial and anterio-medial arm/hand surface + little finger + medial half of ring finger
4th and 5th finger

MEDIAL FLEXORS OF WRIST

injury: inability to abduct or adduct

Question 9

radial nerve

Answer 9

C5-T1

function: MAJOR EXTENSORS of the wrist
sensory: posterio-lateral 3.5 fingers, NOT NAILS

• “YOU’RE WELCOME” nerve
  injury: wrist drop and extension of arm

Question 10

long thoracic nerve

Answer 10

C5-C7

functions: controls upward rotation of scapula, supplies serratus anterior muscle

Question 11

ERB-DUCHENE PALSY

Answer 11

“WAITER’S TIP”

• inability to abduct shoulder
• inability to supinate arm
• inability to flex elbow joint
• constant flexion of wrist

Question 12

RADIAL NERVE INJURY

Answer 12

WRIST DROP

- inability to extend wrist and fingers

Question 13

MEDIAN NERVE INJURY

Answer 13

CARPAL TUNNEL SYNDROME

• inability to pronate forearm
• inability to flex 2nd + 3rd fingers
• inability to flex wrist
• weakened thumb movement

Question 14

ULNAR NERVE INJURY

Answer 14

CLAW HAND

• inability to ab/adduct fingers
• locked joints

Question 15

LONG THORACIC NERVE INJURY

Answer 15

WINGING SCAPULA

- inability to “shrug” shoulder

Question 16

the LUMBAR PLEXUS consists of which major peripheral nerves?

Answer 16

1. femoral
2. obturator
3. genito-femoral

Question 17

the LUMBAR PLEXUS originates from

Answer 17

anterior rami of L1 - L4 (partial addition of T12)

Question 18

femoral nerve

Answer 18

L2-L4

motor: thigh flexion at hip, leg extension at knee
sensory: anterio-medial thigh, medial leg/foot

• MAJOR AND LARGEST OF LUMBAR PLEXUS
• BASEBALL PITCHER FORM

Question 19

obturator nerve

Answer 19

L2-L4

motor: adduction of thigh
sensory: skin over medial thigh

• MILITARY SALUTE
• ADDUCTS LOWER EXTREMITIES

Question 20

genito-femoral nerve

Answer 20

L1-L2

motor: cremasteric reflex (SCROTUM CONTRACTION)
sensory: skin of anterio-medial upper thigh, medial leg + foot

*SURVIVAL OF SPERM

Question 21

the LUMBO-SACRAL PLEXUS consists of which major peripheral nerves?

Answer 21

1. sciatic
2. tibial
3. fibular

Question 22

the LUMBO-SACRAL PLEXUS originates from

Answer 22

anterior rami of L4 - L5, and S1 - S4

Question 23

sciatic nerve

Answer 23

L4-S3

motor: hip extension, knee flexion

• LONGEST NERVE OF THE ENTIRE BODY
• divides above knee into tibial + fibular
• opposite of BASEBALL PITCHER NERVE

Question 24

tibial nerve

Answer 24

motor: knee flexion, foot plantarflexion, inversion (foot)
sensory: skin of posterior leg and foot + sole (SURAL NERVE)

Question 25

fibular nerve

Answer 25

motor: foot plantar flexion and eversion

Question 26

SCIATIC NERVE INJURY

Answer 26

“SCIATICA”

• pain extending from buttock down posterior + lateral aspects of leg, and lateral aspects of foot
• can affect tibial and fibular nerves

Question 27

Long thoracic

Answer 27

C5,6,7
“Wings to heaven”
Winging of the scapula