Anatomy

Question 1

Most common places for herniation to occur?

Answer 1

lower lumbar (L4/L5 or L5/S1) or
lower cervical (C5/C6 or C6/C7)

Question 2

Which nerve root will the spinal compress in a herniation?

Answer 2

The herniated disk will usually compress the spinal nerve roots one
number below the involved disk

Question 3

Which vertebral space contains the internal vertebral venous plexus?

Answer 3

The epidural space

Question 4

Which vertebral space contains CSF?

Answer 4

The subarachnoid space

Question 5

The interlaminar spaces are covered by?

Answer 5

Ligamenta flava

Question 6

Action of Musculocutaneous

nerve C5–6

Answer 6

Flex elbow

Supination (biceps brachii)

Question 7

Action of Median nerve

C5–T1 in the forearm

Answer 7

Flex wrist and all digits

Pronation

Question 8

Action of Median nerve

C5–T1 in the hand

Answer 8

Opposition of thumb
Flex metacarpophalangeal (MP) and extend
interphalangeal (PIP and DIP) joints
of digits 2 and 3

Question 9

Action of Ulnar nerve C5-T1 in the forearm

Answer 9

Flex wrist (weak) and digits 4 and 5

Question 10

Action of Ulnar nerve C5-T1 in the hand

Answer 10

Dorsal – Abduct digits 2-5 (DAB)
Palmar – Adduct digits 2-5 (PAD)
Assist Lumbricals in MP flexion and IP
extension digits 2–5
Flex MP and extend PIP & DIP joints of
digits 4 and 5
Adduct the thumb

Question 11

Action of Axillary nerve

C5–6

Answer 11

Abduct shoulder—15°–110°

Lateral rotation of shoulder

Question 12

Action of Radial nerve

C5–T1

Answer 12

Extend MP, wrist, and elbow

Supination (supinator muscle)

Question 13

Which dermatome is affected if there is parasthesia in Lateral border of
upper arm

Answer 13

C5

Question 14

Which dermatome is affected if there is parasthesia in Lateral forearm to
thumb

Answer 14

C6

Question 15

Which dermatome is affected if there is parasthesia in Medial forearm to
little finger

Answer 15

C8

Question 16

Which dermatome is affected if there is parasthesia in Medial arm to
elbow

Answer 16

T1

Question 17

Major nerves of the lumbosacral plexus

Answer 17

Femoral, obturator, tibial, common fibular, superior gluteal and inferior gluteal nerves

Question 18

Constituents of the sciatic nerve

Answer 18

Tibial and common fibular nerve

Question 19

Divisions of the common fibular nerve

Answer 19

Deep fibular nerve and superficial fibular nerve

Question 20

Actions of femoral nerve

Answer 20

Anterior compartment of thigh;
Extend knee
Flex hip

Question 21

Actions of Obturator

nerve

Answer 21

Medial compartment of thigh;
Adduct thigh
Medially rotate thigh

Question 22

Actions of Tibial nerve

Answer 22

Posterior compartment of thigh- Flex knee and Extend thigh;

Posterior compartment of leg - Plantar flex foot (S1–2)
Flex digits, Inversion;

Plantar muscles of foot

Question 23

Actions of Common fibular nerve

Answer 23

Short head of biceps femoris - flex knee

Question 24

Actions of Superficial

fibular nerve

Answer 24

Lateral compartment of leg - eversion

Question 25

Actions of Deep fibular

nerve

Answer 25

Anterior compartment of leg - Dorsiflex foot (L4–5)
Extend digits
Inversion

Question 26

Pharyngeal arches arise from which embryological structure?

Answer 26

mesoderm and neural crest cells

Question 27

Pharyngeal pouches are lined by which embryological structure?

Answer 27

Endoderm

Question 28

Pharyngeal clefts/grooves are lined by which embryological structure?

Answer 28

Ectoderm