Brachial Plexus

BRACHIAL PLEXUS

Q. 1

Fascia around nerve bundle of brachial plexus is derived from?

 A

Prevertebral fascia

 B

Pretracheal fascia

 C

Investing layer

 D

Superficial cervical fascia

Q. 1

Fascia around nerve bundle of brachial plexus is derived from?

 A

Prevertebral fascia

 B

Pretracheal fascia

 C

Investing layer

 D

Superficial cervical fascia

Ans. A

Explanation:

Cervical fascia can be divided into Superficial cervical fascia and Deep cervical fascia.

  • Superficial Cervical Fascia:

It is usually a thin lamina covering the platysma and is hardly demonstrable as a separate layer.

  • Deep Cervical Fascia:

Deep fascia in the neck is divided into an investing layer, pretracheal layer, prevertebral layer, carotid sheath, buccopharyngeal fascia, and pharyngobasilar fascia.

1.   Investing layer

2.   Pretracheal fascia

3.   Prevertebral fascia

4.   Carotid sheath

5.   Buccopharyngeal fascia

6.   Pharyngobasilar fascia


Q. 2

Which of the following is not a branch of the posterior cord of brachial plexus?

 A

Thoracodorsal nerve

 B

Axillary nerve

 C

Lower subscapular nerve

 D

Ulnar nerve

Q. 2

Which of the following is not a branch of the posterior cord of brachial plexus?

 A

Thoracodorsal nerve

 B

Axillary nerve

 C

Lower subscapular nerve

 D

Ulnar nerve

Ans. D

Explanation:

Ans:D.)Ulnar Nerve.

Cords of Branchial Plexus:

 

LATERAL CORD LATERAL PECTORAL NERVE C5,C6,C7 PECTORALIS MAJOR          –
LATERAL CORD MUSCULOCUTANEOUS NERVE C5,C6,C7

CORACOBRACHIALIS , BRACHIALIS,

         BICEPS BRACHII

LATERAL CUTANEOUS 

    OF FOREARM

LATERAL CORD

LATERAL ROOT OF

   MEDIAN NERVE

C5,C6,C7

FIBERS TO MEDIAN NERVE(Flexion muscle)

        –

POSTERIOR CORD UPPER SUBSCAPULAR NERVE C5,C6 SUBSCAPULARIS (UPPER PART)         –
POSTERIOR CORD THORACODORSAL NERVE C6,C7,C8 LATISSIMUS DORSI         –
POSTERIOR CORD LOWER SUBSCAPULAR NERVE C5,C6

SUBSCAPULARIS(LOWER PART),

TERES MAJOR

        –
POSTERIOR CORD AXILARY NERVE C5,C6

ANT. BRANCH:DELTOID

POST. BRANCH:TERES MINOR, DELTOID

 POST BRANCH – UPPER LATERAL

CUTANEOUS NERVE OF ARM

POSTERIOR CORD RADIAL NERVE C5,C6,C7,C8,T1

 TRICEPS BRACHII,SUPINATOR, ANCONEUS

EXTENSOR OF FOREARM, BRACHIORADIALIS

 POSTERIOR CUTANEOUS

     NERVE OF ARM

MEDIAL CORD MEDIAL PECTORAL NERVE C8,T1   PECTORALIS MAJOR,PECTORALIS MINOR          –
MEDIAL CORD MEDIAL ROOT OF MEDIAN NERVE C8,T1 FIBERS TO MEDIAN NERVE( Flexion muscle)

PART OF HAND NOT SUPPLIED

BY ULNAR OR RADIAL

MEDIAL CORD MEDIAL CUTANEOUS NERVE OF ARM C8,T1              – FRONT AND MEDIAL SKIN OF ARM
MEDIAL CORD MEDIAL CUTANEOUS NERVE OF ARM C8,T1              – MEDIAL SKIN OF FOREARM
MEDIAL CORD ULNAR NERVE C8,T1

FLEXOR CARPII ULNARIS, 2 MEDIAL BELLIES

OF FLEXOR DIGITORUM PROFUNDUS,INTRINSIC

HAND MUSCLE EXCEPT THENAR,2 LATERAL 

MOST LUMBRICUS

SKIN OF MEDIAL SIDE OF HAND

MEDIAL 1/2 FINGERS ON 

PALMAR SIDE, MEDIAL 21/2

FINGER ON DORSAL SIDE



Q. 3

Cord of brachial plexus are named as per their relation with the axillary artery behind which muscle?

 A

Deltoid

 B

Subclavius

 C

Teres major

 D

Pectoralis minor

Q. 3

Cord of brachial plexus are named as per their relation with the axillary artery behind which muscle?

 A

Deltoid

 B

Subclavius

 C

Teres major

 D

Pectoralis minor

Ans. D

Explanation:

Pectoralis minor crosses in front of axillary artery and divides it into three parts. The anterior relation of each part are; First part lies behing the pectoralis major muscle, second part lies behind the pectoralis minor and major muscle and third part lies behind pectoralis major.

The cords of brachial plexus are named according to their relation with the second part of  axillary artery, lateral cord runs lateral to the axillary artery, as well the medial and posterior cord lies medially and posterior to the axillary artery. Thus the muscle anteriorly to second part is pectoralis minor and major.


Q. 4

Which of the following nerve arise from the lateral cord of the brachial plexus?

 A

Ulnar nerve

 B

Musculocutaneous nerve

 C

Medial root of median nerve

 D

Medial cutaneous nerve of arm

Q. 4

Which of the following nerve arise from the lateral cord of the brachial plexus?

 A

Ulnar nerve

 B

Musculocutaneous nerve

 C

Medial root of median nerve

 D

Medial cutaneous nerve of arm

Ans. B

Explanation:

Musculocutaneous nerve arise from the lateral cord of the brachial plexus. Other nerves arising from the lateral cord are lateral root of median nerve and lateral pectoral nerve.
 
Branches of the medial cord of the brachial plexus are:
  • Medial root of median nerve
  • Medial pectoral
  • Medial cutaneous nerve of forearm
  • Medial cutaneous nerve of arm
  • Ulnar nerve
Branches of the posterior cord are:
  • Upper subscapular
  • Lower subscapular
  • Thoracodorsal
  • Axillary nerve
  • Radial nerve.

Q. 5

Concerning Brachial plexus, which of the following facts are true:

 A

Formed by spinal nerve C5 – T1

 B

Most common site of injury is upper trunk

 C

It is surrounded by fascia derived from prevertebral fascia

 D

All

Q. 5

Concerning Brachial plexus, which of the following facts are true:

 A

Formed by spinal nerve C5 – T1

 B

Most common site of injury is upper trunk

 C

It is surrounded by fascia derived from prevertebral fascia

 D

All

Ans. D

Explanation:

A, B, C i.e. Formed by spinal nerve C5 – T1, Most common site of injury is upper trunk , Injury may occur during breech delivery, & Lower trunk injury results in hand deformity


Q. 6

Which among the following is a branch from the trunk of brachial plexus?

 A

Suprascapular nerve

 B

Long thoracic nerve

 C

Nerve to subclavius

 D

A & C

Q. 6

Which among the following is a branch from the trunk of brachial plexus?

 A

Suprascapular nerve

 B

Long thoracic nerve

 C

Nerve to subclavius

 D

A & C

Ans. D

Explanation:

A i.e. Suprascapular nerve

Suprascapular nerve (C5, 6) nerve to subclavius (C5, 6) arises from upper part of trunk of  brachial plexus


Q. 7

Musculocutaneous nerve is injured at the lateral cord of brachial plexus, positive clinical findings would be:

 A

Loss of flexion at shoulder

 B

Sensory loss on the radial side of the forearm

 C

Loss of extension of forearm

 D

Loss of extension of the wrist

Q. 7

Musculocutaneous nerve is injured at the lateral cord of brachial plexus, positive clinical findings would be:

 A

Loss of flexion at shoulder

 B

Sensory loss on the radial side of the forearm

 C

Loss of extension of forearm

 D

Loss of extension of the wrist

Ans. B

Explanation:

B i.e. Sensory loss on the radial side of forearm


Q. 8

All of the following are branches from the CORDS of brachial plexus EXCEPT:             

 A

Suprascapular nerve

 B

Upper subscapular nerve

 C

Lower subscapular nerve

 D

Lateral pectoral nerve

Q. 8

All of the following are branches from the CORDS of brachial plexus EXCEPT:             

 A

Suprascapular nerve

 B

Upper subscapular nerve

 C

Lower subscapular nerve

 D

Lateral pectoral nerve

Ans. A

Explanation:

Suprascapular nerve


Q. 9

All of the following muscles of the pectoral girdle are innervated by branches from the brachial plexus: except:     

 A

Subclavius

 B

Serratus anterior

 C

Rhomboid major

 D

Trapezius

Q. 9

All of the following muscles of the pectoral girdle are innervated by branches from the brachial plexus: except:     

 A

Subclavius

 B

Serratus anterior

 C

Rhomboid major

 D

Trapezius

Ans. D

Explanation:

Trapezius is supplied by spinal part of cranial nerve XI


Q. 10

Axillary nerve is a branch of which part of brachial plexus ‑

 A

Trunk

 B

Medial cord

 C

Lateral cord

 D

Posterior cord

Q. 10

Axillary nerve is a branch of which part of brachial plexus ‑

 A

Trunk

 B

Medial cord

 C

Lateral cord

 D

Posterior cord

Ans. D

Explanation:

Supraclavicular branches of brachial plexus

Branches of brachial plexus which are above the clavicle are called supraclavicular branches.

These arise from roots and trunks.


Q. 11

Largest branch of brachial plexus is 

 A

Ulnar

 B

Medial

 C

Radial

 D

Axillary

Q. 11

Largest branch of brachial plexus is 

 A

Ulnar

 B

Medial

 C

Radial

 D

Axillary

Ans. C

Explanation:

Ans. is ‘c’ i.e., Radial 

  • Radial nerve is the largest branch of brachial plexus and is the continuation of posterior cord (root value C5_8 T1).

Q. 12

All are infraclavicular branches of brachial plexus except ‑

 A

Ulnar nerve

 B

Long thoracic nerve

 C

Axillary nerve

 D

Thoracodorsal nerve

Q. 12

All are infraclavicular branches of brachial plexus except ‑

 A

Ulnar nerve

 B

Long thoracic nerve

 C

Axillary nerve

 D

Thoracodorsal nerve

Ans. B

Explanation:

Ans. is `b’ i.e., Long thoracic nerve


Q. 13

Which of the following nerve carries fibres from all the roots of brachial plexus ‑

 A

Axillary

 B

Ulnar

 C

Median

 D

Musculocutaneous

Q. 13

Which of the following nerve carries fibres from all the roots of brachial plexus ‑

 A

Axillary

 B

Ulnar

 C

Median

 D

Musculocutaneous

Ans. C

Explanation:

Ans. is ‘c’ i.e., Median 

Only two nerves carry fibres from all the roots of brachial plexus, i.e. C5 to T, :‑

   1. Median nerve (C5– TI)

  • Lateral root (C5 – C7)
  • Medial root (C8 Ti )

 2. Radial nerve (C5 – T,)


Q. 14

Posterior cord of brachial plexus is formed by‑

 A

Ventral division of upper trunk

 B

Dorsal division of upper trunk

 C

Ventral divisions of upper, middle & lower trunks

 D

Dorsal divisions of upper, middle & lower trunks

Q. 14

Posterior cord of brachial plexus is formed by‑

 A

Ventral division of upper trunk

 B

Dorsal division of upper trunk

 C

Ventral divisions of upper, middle & lower trunks

 D

Dorsal divisions of upper, middle & lower trunks

Ans. D

Explanation:

Ans. is ‘d’i.e., Dorsal divisions of upper, middle & lower trunks 



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