BIO125 - 12SpinalNerves

Question 0

• brachial plexus
• SB: skin on shoulder and superior posterior arm
• MB: shoulder (ex deltoid and teres major)

Answer 0

axillary

Question 1

• cervical plexus
• sensory branches: diaphragm, pleura and pericardium
• motor branches: diaphragm (need for breathing/respiration)

Answer 1

phrenic plexus

Question 2

brachial plexus

• SB: posterolateral skin of entire limb (except dorsum of digits 2 and 3)
• MB: forearm, wrist, and finger extensors (ex triceps brachii, extensor carpi radialis, and ulnaris, supinator)

Answer 2

radial

Question 3

brachial plexus ( runs along midline of arm on medial surface)

• SB: lateral 2/3 of palm and dorsum of tips of digits 1-4
• MB: wrist and finger flexors (ex: flexor carpi radialis, flexor digitorum, pronator muscles)

Answer 3

median

Question 4

brachial plexus

• SB: medial 1/3 of hand on both sides
• MB: most muscles of the hand; wrist and finger flexors (ex: flexor carpi ulnaris,, flexor digitorum profundus)

Answer 4

ulnar

Question 5

brachial plexus

• SB: skin on anterolateral forearm
• MB: forearm flexors (ex: biceps brachii and brachialis)

Answer 5

musculocutaneous

Question 6

lumbar branch

• SB: skin on anteromedial thigh and medial led and foot
• MB: anterior thigh (ex: quadriceps femoris, sartorius, iliacus)

Answer 6

femoral

Question 7

lumbar plexus

• SB: skin on medial thigh
• MB: adductor muscles and gracilis

Answer 7

obturator

Question 8

lumbar plexus

• SB: skin on anterior and upper lateral thigh
• MB: none

Answer 8

lateral femoral cutaneous

Question 9

sacral plexus

• SB: skin on posterior leg and sole of foot
• MB: posterior leg, thigh and most foot muscles (e: calf and hamstring muscles, tibialis posterior, toe flexors)

Answer 9

tibial

Question 10

sacral plexus

• SB: skin on anterior distal leg and dorsum of foot and toes
• MB: anterior and lateral leg muscles; toe extensors (ex: fibularis muscles, tibialis anterior)

Answer 10

common fibular

Question 11

sacral plexus

• SB: skin on buttock, posterior thigh, and popliteal region
• MB: none

Answer 11

posterior femoral cutaneous

Question 12

there are \_\_ pairs of spinal nerves that branch off:
cervical
thoracic
lumbar
saccral
coccygeal

Answer 12

C=8
T=12
L=5
S=5
C=1

Question 13

Intercostal nerves A.K.A

Answer 13

thoracic nerves

Question 14

Lumbar plexus:

Answer 14

L1-L4 (4)

Question 15

Sacral plexus:

Answer 15

L4-S4 (6)

Question 16

Dorsal ramus serves:

Answer 16

(sensory) posterior trunk

Question 17

ventral ramus serves:

Answer 17

(motor) anterior and lateral trunk and limbs

Question 18

all rami are sensory or motor?

Answer 18

MIXED!

Question 19

• from ventral rami of T2-T12

- serve anterior and lateral trunk

Answer 19

intercostal nerves

Question 20

• NETWORKS

- from ventral rami ABOVE T2 and BELOW T12

Answer 20

plexuses

Question 21

• from plexuses
• are ALL MIXED
• serve limbs and appendages

Answer 21

peripheral nerves

Question 22

• from C1-C5

- Serves shoulder and neck muscles

Answer 22

cervical

Question 23

• from C5-T1

- Serves shoulder and arm

Answer 23

brachial plexus

Question 24

• passes through sciatic notch
• largest lumbar nerve
• composed of two nerves: ?

Answer 24

sciatic nerve

1. tibial
2. common fibular