Brachial Plexus

Question 1

Plexus definition

Answer 1

A complex interwoven network of nerves or arteries

Question 2

Brachial plexus rami

Answer 2

C5 to T1

Question 3

Order of structures in the b plexus

Answer 3

Roots
Trunks
Divisions
Cords 
Branches

Question 4

B plexus roots

Answer 4

C5 to T1

Question 5

Trunks

Answer 5

Superior (C5 and C6)
Middle (C7)
Inferior (C8 and T1)

Question 6

Divisions

Answer 6

An anterior and posterior branch from each trunk

Question 7

Cords

Answer 7

Lateral (superior and middle trunk)
Posterior (all 3 trunks)
Medial (inferior trunk)
In relation to the axillary artery

Question 8

Branches

Answer 8

Musculocutaneous (Lateral M)
Median (Middle M)
Ulnar (Medial M)
Radial
Axillary

Question 9

Musculocutaneous nerve

Answer 9

Anterior compartment of arm
Flexion
C5, C6, C7

Question 10

Radial nerve

Answer 10

Posterior compartment of arm and forearm
Extension of arm, wrist, and hand
C5 C6 C7 C8 T1

Question 11

Median nerve

Answer 11

Anterior compartment of forearm
Flexion of hand and wrist
C6 C7 C8 T1

Question 12

Ulnar nerve

Answer 12

Intrinsic muscles of hhand

C7 C8 T1

Question 13

Axillary nerve

Answer 13

Deltoid and teres minor

C5 C6

Question 14

Long thoracic nerve

Answer 14

C5 C6 C7

Serratus anterior

Question 15

Axillary artery

Answer 15

Once the subclavian crosses the first rib

Once it crosses the latissumus dorsi it changes to brachial artery

Question 16

3 muscles forming the anterior wall

Answer 16

Pectoralis major
Pectoralis minor
Subclavius

Question 17

1 muscle forming medial wall

Answer 17

Serratus anterior

Question 18

3 muscles forming the posterior wall

Answer 18

Subscapularis
Teres major
Long head of triceps

Question 19

Quadrangular space

Answer 19

Between subscapularis, long head, teres major, and humerus

Where the axillary nerve lies

Question 20

Triangular interval

Answer 20

Borders are the long head of triceps, teres major, and humerus
Where the radial nerve and profunda brachii artery exits

Question 21

Biceps brachii

Answer 21

Long head attaches to the glenoid fossa
Short head attaches to coracoid process
Distal end attaches to radius
Main function: Flexion of forearm at elbow

Question 22

3 muscles in the anterior compartment of the arm

Answer 22

Biceps brachii
Brachialis
Coracobrachialis

Question 23

Anterior arm compartment muscles are innervated by…

Answer 23

Musculocutaneous nerve

Question 24

Main function of brachialis

Answer 24

Flexion of forearm at elbow

Question 25

Main function of coracobrachialis

Answer 25

Flexion of arm at shoulder

Question 26

2 muscles in the posterior compartment of the arm

Answer 26

Triceps brachii (long, lateral, and medial head)
Teres major

Question 27

Triceps brachii

1. innervated by
2. primary function

Answer 27

1. radial nerve

2. extension of forearm at elbow

Question 28

3 veins in the cubital fossa

Answer 28

Cephalic vein
Basilic vein
Median cubital vein