Anatomy - Spinal Nerves

Question 1

How would you know if a pathology was affecting either anterior or posterior ramus?

Answer 1

Anterior rami supply anterolateral body wall

Posterior rami supply posterior body wall

Question 2

How would you know if a pathology was affecting either the anterior or posterior root?

Answer 2

Anterior - motor

Posterior - sensory

Question 3

Name the spinal nerve root levels of the femoral nerve

Answer 3

L2, L3, L4

Question 4

How many true dermatomes does the area of cutaneous innervation of the femoral nerve cross?

Answer 4

3 - L2, L3, L4

Question 5

What is the peripheral cutaneous innervation of the neck anterolaterally? Name the nerves and their roots.

Answer 5

Lesser occipital nerve (C2)

Great auricular nerve (C2,3)

Transvere cervical nerve (C2,3)

Supraclavicular nerves (C3,4)

Question 6

What is the peripheral cutaneous innervation of the neck posteriorly? Name the nerves and their roots.

Answer 6

Mainly the posterior rami of spinal nerves - C2-C8

Question 7

What is the nerve point of the neck?

Answer 7

Just above midpoint of posterior border of SCM

Where sensory nerves of cervical plexus start (which cutaneously innervate anterolateral neck)

Question 8

What is the only spinal nerve contributing to facial sensation?

Answer 8

Great auricular nerve (C2,3)

Question 9

Describe the peripheral cutaneous innervation of the upper trunk wall.

Answer 9

Same as dermatomal pattern

Upper anterolateral trunk wall: intercostal nerves

At T12 - subcostal nerve (ant tamus of T12)

Question 10

Describe the peripheral cutaneous innervation of the lower trunk wall.

Answer 10

L1 bifurcates –> iliohypogastric and ilioinguinal nerves

Question 11

What is the cutaneous innervation of the back?

Answer 11

POsterior rami

Question 12

Name the nerve and its roots that supplies the green area.

Answer 12

lateral cutaneous nerve of the thigh (L2,3)

Question 13

Name the nerve and its roots that supplies the purple area.

Answer 13

saphenous nerve (from femoral: L3,4)

Question 14

Name the nerve and its roots that supplies the yellow area.

Answer 14

superficial fibular nerve (L4,L5,S1)

Question 15

Name the nerve and its roots that supplies the v light green area.

Answer 15

Obturator nerve (L2,3,4)

Question 16

Name the nerve and its roots that supplies the red area.

Answer 16

genitofemoral nerve (L1,2)

Question 17

Name the nerve and its roots that supplies the light blue area.

Answer 17

Sural nerve (from tibial & common fibular: S1,2)

Question 18

Name the nerve and its roots that supplies the pink area.

Answer 18

POsterior cutaneous nerve of the thigh (S1,2,3)

Question 19

Name the nerve and its roots that supplies the pink area.

Answer 19

Supraclavicular nerves (C3,4)

Question 20

Name the nerve and its roots that supplies the dark blue area.

Answer 20

Axillary nerve (C5,6)

Question 21

Name the nerve and its roots that supplies the light blue area.

Answer 21

Ulnar nerve ((C7),C8,T1

Question 22

Name the nerve and its roots that supplies the turqoise area.

Answer 22

Cutaneous branch of the musculocutaneous nerve (C5,6,7)

Question 23

Name the nerve and its roots that supplies the red area. What else does it supply?

Answer 23

Radial nerve ((C5),C6,7,8(T1))

Also supplies the anatomical snuffbox

Question 24

Name the nerve and its roots that supplies the purple area.

Answer 24

Median nerve ((C5),C6,7,8,T1)

Also supplies the finger tips of these fingers

Question 25

What muscles does the cervical plexus supply?

Answer 25

Neck postural and strap muscles

Diaphragm

Question 26

What muscles does the brachial plexus supply?

Answer 26

Muscles of the upper limb

Extrinsic back muscles

Question 27

What muscles does the lumbosacral plexus supply?

Answer 27

Muscles of the lower limb

Perineal skeletal muscles

Question 28

What spinal nerves supply motor axons to the postural back muscles and intercostal muscles?

Answer 28

T2-L3