L21: Peripheral Nervous System (PNS)

Question 1

each spinal nerve arises from?

Answer 1

one spinal segment

Question 2

in ventral rami, when does branching between spinal segments occur

Answer 2

• from T1-T12

Question 3

what are dermatomes?

Answer 3

• area of skin innervated by single spinal nerve

Question 4

which vertebra does the cervical nerve plexus correlate with? what body parts does it innervate

Answer 4

• c1 - c5
• neck
• diaphragm: phrenic (c3-c5)

Question 5

which vertebrae does the brachial plexus correlate with? what body parts does it innervate

Answer 5

• c5-t1
• pectoral girdle
• upper limb

Question 6

which vertebrae does the lumbar plexus correlate with? what body parts does it innervate

Answer 6

• T12 - L4
• pelvic girdle
• lower limb

Question 7

which vertebrae does the sacral plexus correlate with? what body parts does it innervate

Answer 7

• L4 - S4
• pelvic girdle
• lower limb