Nerves

Question 1

Median

Answer 1

• Arrises from the lateral cord and the medial cord
• Nerve route lateral C6,7 medial C8,T1
• Enters lateral to brachial artery
• Enters cubital fossa below the biceps apeneurosis
• Passes between the two heads of pronator teres
• Deep to FDS and superifical to FDP
• Passes under the flexor retinaculum into palmar aspect of the hand
• Divides into terminal branches and innervates the thena rmuscle s
  Muscles
• Pronator teres
• Wrist Flexors such FDS FDP
• Thenar muscles
• 2 lateral lumbricals moving 2nd and 3rd finger
• Lateral half of the palm
• first 3 fingers and lateral 4th finger

Question 2

Radial

Answer 2

• Posterior cord of brachial plexus
• C5,6,7,8,T1
• Descends behind the brachial artery anterior to subscapualris
• Descends on the posterior surface of the humerus.
• then wraps around the distal end of the humerus where it penetrates the intermuscular septum
• Passes through the cubital fossa and terminates anterior to the lateral epicondyle and divides into deep and sueprficial branches

Deep (posterior interosseus nerve)
- provides motor innervation to the posterior compartment of the forearm
Superficial
- sensation to the thenar eminence, thumb and 1st half the first finger

Muscles
- Triceps brachii
- Brachioradialis
- Extensors of the arm
- ECRL ECRB ECU and the thumb flecors

Question 3

Ulnar

Answer 3

• Arises from the medial cord C8, T1
• Runs through the axilla and runs medial until reaching the mid arm
• Descends in front of the medial head of triceps muscle
• Passes between the medial epicondyle and the olecranon
• Enters the forearm by passing through the two heads of FCU
• Descends along the medial aspect of the forearm
• before wrist it divides into dorsdal branch.
• Passes anterior to flexor retinaculum and divides into superficial and deep branches
  Muscles
• FCU and medial healf of FDP
• Most of the intrinisc hand msucles
  Sensory
• Anterior aspect of littl efinegr and half ring finger and the skin on the medial anterior and dorsal aspect of the hand.

Question 4

Axillary

Answer 4

• Posterior cord of brachial plexus C5 and C6
• Lies posterior to the axillary artery
• Curves back and passes through a space bordered by subscap, teres minor and major and long head of triceps
• Divides into anterior and posterior branches
• The anteiror curves around the neck of huemrus passing deep to deltoid
• The posterior branch traverls to deltoid
  Muscles
• Deltoid
• Teres minor
• Long head of triceps
• The GHJ
  Sensory
• The skin around the shoulder

Question 5

Musculocutaneous

Answer 5

• Arises from the lateral cord of the brachial plexus C5,6,7
• Emerges from the lower lateral borderr of the pec minor muscle
• Pierces through the coracobrachialis
• Runs Lateral to biceps and brachialis
• Lateral to the biceps tendond at the elbow crosses the joint
• Pierces the deep fascia and travels as the lateral cutaneous
  Muscles
• Coracobrachialis
• Biceps bracchi
• Brachialis

Question 6

Peroneal

Answer 6

• L4, L5, S1, S2
• Descends along the lateral border of the politeal fossa to the head of the fibual
• Between the tendon of biceps femoris and lateral head of gastrocnemius
• Curves lateral to the neck of fibula deep to peroneus longus
• Divides into superifical and deep
  Superficial
• Pierces the fascia in distal leg and divides into medial and lateral cutaneous branches
  Deep
• Passes Obliquely forward
• In the proximal third of the leg it descends into the ankle
• Enters foot and divides into lateral and medial branches
  Muscles
• Tibialis anterior
• EDL
  -EHL
  -PL
  -PB

Question 7

Sciatic

Answer 7

• Sacral plexus L4,5.S1.S2.S3
• Medial border of piriformis
• Exits the pelvis through greater sciatic foramen
• Travels posteriorly behind the deep lateral rotators of the hip
• Descends the thigh musway between GT and ischial tuberosity
• Under glutes and hamstrings
• At the apex of the popliteal fossa it dividees into common peroneal nerve and tibial nerve
  Muscles
• Glute max
• Hamstring
  Adductor magnus

Question 8

Tibial

Answer 8

• Sacral plexus L4,5,S1,S2,S3
• From under the hamstrinngs
  Descends from the apex of the popliteal fossa
• Under the heads of gastrocnemius and soleus
• It lies of tibialis posteriroly
• At the midpoint between the Tib ant and medial mallelous
• Passes behind the medial malleolus deep to the flexor retinaculum
• Between the FHL and FDL
• Divides into medial and lateral plantar nerves

Muscles
- Soleus
- Plantaris
-popliteus
- Tibialis posterior
-FDL and B
-FHL and B
- Lumbricals