Nerves of the upper limb: radial, ulnar and median

1. 1The radial nerve

   1. Acontains fibres derived from only the sixth, seventh and eighth cervical spinal nerves.
   2. Bpasses in front of the humerus from the medial to the lateral side
   3. Csupplies the muscles on the posterior aspect of the upper arm and forearm
   4. Dsupplies sensory branches to the nail beds of the index and middle fingers.
   5. Eis the only nerve supplying the triceps muscle
2. 2The flexor digitorum profundus muscle

   1. Ahas an attachment to the ulna and not the radius
   2. Bis supplied only by the ulnar nerve
   3. Ccan flex the distal, middle and proximal phalanges of the hand
   4. Dis deep to the flexor digitirum superficialis muscle and tendons along its whole course
   5. Ehas only three of the four lumbrical muscles attached to its tendons in the hand
3. 3If the ulnar nerve is cut at the elbow

   1. Apart of the flexor digitorum supericialis is paralysed
   2. Bthere is a loss of sensation in the back of the index finger
   3. Cflexion at the metacarpophalangeal joints are kept extended
   4. Dthe distal phalanges of all the fingers are extended at the distal interphangeal joints
   5. Ethe movement of opposition of the thumb is usually lost
4. 4If the median nerve is cut at the wrist

   1. Asensation in the skin over the back of the whole of the index finger is lost
   2. Badduction of the thumb is lost
   3. Cthe movement of opposition of the thumb is usually lost
   4. Dflexin at the metacarpophalangeal joint of the thumb is impossible
   5. Eextension at the interphalangeal joints of the index finger is lost

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Quiz on Untitled, created by Zainab Iqbal on 12/12/2021.

Author

Zainab Iqbal

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English

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medicine

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