Median Nerve

Question 1

What are the roof and content of cubital fossa?
What is cubital fossa

Answer 1

Content of cubital fossa from medial to lateral side
Median nerve
Brachial artery
tendon of Biceps muscle
Superficial branch of radial nerve

Roof : Bicipital aponeurosis and median cubital vein

Cubital fossa is the triangular shaped fossa in front of the elbow

Question 2

What is the modification of palmaris longus in the palm

Answer 2

Palmar aponeurosis

Question 3

Nerve supply of flexor digitorum profundus and where it innervate?

Answer 3

Lateral half: Anterior interosseus nerve
supply tendon to index finger and middle finger
Medial half : ulnar nerve supply tendon to little finger and ring finger

Question 4

Muscle of forearm supply directly by median nerve:

Answer 4

Pronator teres
FCR
palmaris longus
FDS

Question 5

Median nerve in the palm gives a motor / recurrent branch. Which muscles are supplied by it?

Answer 5

LOAF muscle
Lumbricals 1 and 2
thenar eminence muscles:
Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

Question 6

Palmar branch of median nerve which carrying sensory fibre pass through which part pf flexor retinalculum band and where it supply?

Answer 6

Above fr band
It carries sensory fibers to THENAR EMINENCE

Question 7

In supracondylar fracture of humerus, which nerve is most commonly affected?

Answer 7

Anterior interosseous nerve > median nerve b/c for ai nerve ,its fibres arise at a higher level (above elbow)

Question 8

What are the features of median nerve injury? ( supracondylar fracture of humerus and ai nerve and median nerve get injured)

Answer 8

All forearm flexor muscles of anterior compartment are paralysed.
flexor carpi ulnaris is normal so have ulnar deviation of wrist
FDS and lateral half of FDP (AIN) are paralysed.

Pronation lost ( p:teres. and p:quadratus(AIN)

Paralysis of loaf muscles: Thenar eminence atrophy

Loss of opposition of thumb: lead to Ape thumb deformity

Sensory loss over
Thenar eminence ( palmar branch affected)
Palmar surface of lateral 3.5 finger loss of sensation

Question 9

What is Benedictian hand deformity?

Answer 9

During median and AI nerve injury ,
FDS and lateral half FDP ( ain) is paralysed

So
Loss of flexion of interphalangeal joints of midde and index finger , it is called Benediction hand deformity

Question 10

What is overlapping and pointing index deformity?

Answer 10

Overlapping is as a result of paralysis of lateral half of FDP ( by AIN ) rarely the ulnar nerve supplies the tendon to middle finger which result in loss of flexion of IP joint of ONLY THE INDEX FINGER which is called POINTING INDEX DEFORMITY

Question 11

What is wrist slash injury?
Features?

Answer 11

Injury on lateral (radial side)
It is the median nerve injury at the wrist ( lower part of forearm)

Features

Paralysis of LOAF muscle
1.thenar eminence atrophy
2.ape thumb deformity
Loss of sensation over thenar eminence ( palmar branch affected)
Loss of sensation over lateral 3.5 digit on palmar side.

Question 12

WHAT IS CARPEL TUNNEL SYNDROME?

Answer 12

Compression of median nerve while passing BELOW FLEXOR RETINACULUM BAND.

Features are SAME as that of wrist slash injury EXCEPT

Sensory supply of thenar eminence is normal b/c palmar branch of median nerve pass above the fr band