Peripheral cutaneous innervation

Question 1

Peripheral cutaneous innervation in the neck - anterolaterally

Answer 1

• Lesser occipital (C2) - lateral skin behind the ear to mid neck
• Great auricular nerve (C2, 3) - posterior ear, V shaped area below jaw angle
• Transverse cervical (C2, 3) - anterior neck
• Supraclavicular nerves (C3, 4) - antero-lateral neck

Question 2

Peripheral cutaneous innervation in the neck - posterior

Answer 2

Mainly the posterior rami of spinal nerves C2-C8

Question 3

Clinically important site with regards to peripheral cutaneous innervation in the neck

Answer 3

• Nerve point of neck
• Just above midpoint of posterior border of SCM
• Sensory nerves of cervical plexus
• Special care required during biopsy

Question 4

Peripheral cutaneous innervation of the trunk - upper anterolateral trunk wall

Answer 4

intercostal nerves

Question 5

Peripheral cutaneous innervation of the trunk - lowest thoracic level?

Answer 5

subcostal nerve - anterior ramus of T12

Question 6

Peripheral cutaneous innervation of the trunk - lower anterolateral trunk wall

Answer 6

iliohypogastric and ilioinguinal nerves - bifurcation of anterior ramus of L1

Question 7

Peripheral cutaneous innervation of upper limb - supraclavicular nerves

Answer 7

• Supraclavicular nerves = C3, C4
• Anteriorly and posteriorly - top of the shoulder

Question 8

Peripheral cutaneous innervation of upper limb - axillary nerve areas

Answer 8

• Axillary nerve = C5, C6
• Anteriorly and posteriorly - badge patch

Question 9

Peripheral cutaneous innervation of upper limb - cutaneous branch of musculocutaneous nerve

Answer 9

• cutaneous branch of musculocutaneous nerve = C5, C6, C7
• Anterior - lateral forearm
• Posterior - tiny bit behind ^

Question 10

Peripheral cutaneous innervation of upper limb - radial nerve

Answer 10

• Radial nerve = (C5), C6, C7, C8, (T1)
• Anteriorly - anatomical snuff box and bottom of the thenar aspect
• Posteriorly - lower half of thumb, index and middle fingers to lower lateral half of wrist

Question 11

Peripheral cutaneous innervation of upper limb - ulnar nerve

Answer 11

• Ulnar nerve = (C7), C8, T1
• Anteriorly - little finger, ring finger and medial half of wrist
• Posteriorly - ^

Question 12

Peripheral cutaneous innervation of upper limb - median nerve

Answer 12

• Median nerve = (C5), C6, C7, C8, T1
• Anteriorly - thumb, index, middle finger (except anatomical snuff box = radial)
• Posteriorly - upper half of thumb, index and middle fingers (above radial distribution below)

Question 13

What is the peripheral cutaneous innervation of upper limb responsible for referred pain from the myocardium?

Answer 13

Anterior rami of T1 and T2

Question 14

The anatomical snuff box is supplied by cutaneous branches of the

Answer 14

radial nerve

Question 15

Peripheral cutaneous innervation of lower limb - ilioinguinal nerve

Answer 15

• Ilioinguinal nerve = L1
• Anteriorly a wee bit of uppermost innermost thigh

Question 16

Peripheral cutaneous innervation of lower limb - genitofemoral nerve

Answer 16

• Genitofemoral nerve = L1, L2
• Anteriorly - wee bit of the middle of the uppermost thigh

Question 17

Peripheral cutaneous innervation of lower limb - subcostal nerve

Answer 17

Anteriorly - lateral corner of uppermost thigh

Question 18

Peripheral cutaneous innervation of lower limb - ilio-hypogastric nerve

Answer 18

Posteriorly - lateral corner of uppermost thigh

Question 19

Peripheral cutaneous innervation of lower limb - lateral cutaneous nerve of thigh

Answer 19

• Lateral cutaenous nerve of thigh = L2, 3
• Anteriorly and posteriorly - lateral upper thigh

Question 20

Peripheral cutaneous innervation of lower limb - obturator nerve

Answer 20

• Obturator nerve = L2, 3, 4
• Anteriorly - just below ilioinguinal nerve distribution, upper medial thigh
• Posteriorly - a wee bit continued behind^

Question 21

Peripheral cutaneous innervation of lower limb - femoral nerve

Answer 21

• Femoral nerve = L2, 3, 4
• Anteriorly - large part of thigh and kneecap
• Posteriorly - wee bit of medial knee

Question 22

Peripheral cutaneous innervation of lower limb - saphenous nerve

Answer 22

• Saphenous nerve = L3, 4 - from femoral
• Anteriorly - most of leg (little bit of anterolateral from sural)
• Posteiorly - medial leg

Question 23

Peripheral cutaneous innervation of lower limb - sural nerve

Answer 23

• Sural nerve = S1, 2 - from tibial and common fibular
• Anteriorly and posteriorly - lateral leg

Question 24

Peripheral cutaneous innervation of lower limb - superficial fibular nerve

Answer 24

• Superficial fibular nerve = L4, L5, S1
• Anteriorly - lateral ankle, medial and lateral foot (broadly)

Question 25

Peripheral cutaneous innervation of lower limb - deep fibular nerve

Answer 25

- Deep fibular nerve = L5 - Anteriorly - triangular shaped area spanning lateral big toe and medial index toe

Question 26

Peripheral cutaneous innervation of lower limb - calcaneal nerves

Answer 26

- Calcaneal nerves - branches of the tibial nerve (L4, L5, S1, S2, S3) - Posteriorly - posterior and inferior heel

Question 27

Peripheral cutaneous innervation of lower limb - medial and lateral plantar nerves

Answer 27

- Medial and lateral plantar nerves = branches of the tibial nerve (L4, L5, S1, S2, S3) - Posteriorly - medial and lateral plantar surfaces of foot