Mod5-Obj8: Nerve plexuses

Question 1

Nerve plexuses

Answer 1

After emerging from the vertebral column, most spinal nerves (not thoracic) branch and interconnect to form nerve networks

Question 2

The four main plexuses that supply the trunk and limbs with sensory and motor innervation

Answer 2

1. ) Cervical plexus
2. ) Brachial plexus
3. ) Lumbar plexus
4. ) Sacral plexus

Question 3

Cervical Plexus

Answer 3

Arises from spinal nerves C1 to C5

• Innervates the skin (sensory) and skeletal muscles (motor) of the
  1. ) Head (posterior), neck and shoulders
  2. ) Diaphragm

Question 4

Brachial Plexus

Answer 4

Arises from spinal nerves C4 to T1

• Innervates the skin (sensory) and skeletal muscles (motor) of the
  1. ) Shoulders
  2. ) Arms
  3. ) Hands

Question 5

Damage to the brachial plexus

Answer 5

Paralysis of upper limb

Question 6

Lumbar plexus

Answer 6

Arises from spinal nerves L1-L4

• Innervates the skin (sensory) and skeletal muscles (motor) of the:
  1. ) Lower abdomen
  2. ) Hips
  3. ) Anterior&medial thigh, leg& foot

Question 7

Largest branch of lumbar plexus

Answer 7

Femoral nerve

Question 8

Damage to lumbar plexus

Answer 8

Walking difficulties

Question 9

Sacral Plexus

Answer 9

Arises from spinal nerves L4 to S4

• Innervates the skin (sensory) and skeletal muscles (motor) of the:
  1. ) Buttocks
  2. ) Posterior thigh
  3. ) Leg and foot

Question 10

Largest branch of sacral plexus

Answer 10

Sciatic nerve

Question 11

Damage to sacral plexus

Answer 11

Sciatica, walking difficulties

Question 12

Largest branch of brachial plexus

Answer 12

• Axillary
• Musculocutaneous
• Median
• Radial
• Ulnar

Question 13

Largest branch of the cervical plexus

Answer 13

Phrenic nerves