Brachial Plexus

Question 1

describe the axillae

Answer 1

• pyramidal structure
• floor is the armpit skin (axillary fascia)
• later wall is the humerus
• medial wall is the thoracic wall
• apex is the lateral border of first rib, superior border of scapula and posterior border of clavicle
• anterior wall is the pectoralis major , minor and subclavicus
• posterior wall is the latissimus dosi, therest major and subscapularis

Question 2

movements of the upper lim

Answer 2

• abduct the arm at the glenohumeral joint , this is controlled by C5(musculocutaneous nerve)

Question 3

where are the testing points of the different spinal cords of upper limb for sensation

Answer 3

• C5 bicep
• 6 = thumb, (palmar of thumb)
• 7=index finger pad (tip)
• 8 = little finger pad
• T1 = elbow

Question 4

testing the nerve roots for movement

Answer 4

• C5 = abduct the shoulder
• 6 = flexion of the forearm
• 7 extension of the forearm
• 8=flexion of fingers
• T1= abduction and adduction of the digits ( fingers excluding the thumb)

Question 5

what do you do with an unconscious patient

Answer 5

• tap the tendon in the curtail fossa for C6

- and tap the tricep posterior to the elbow for C7

Question 6

whats evaluating the nerves of the brachial plexus got to do with breathing

Answer 6

-C4 one of the nerves associated with innervating the diaphragm is just above the plexus so damage to plexus possible damage to breathing
(C456 keep diaphragm and pericardium alive)

Question 7

what does the axillary innervate and contain

Answer 7

• C5 6

- the delotid and the cutaneous region of the shoulder

Question 8

what does the musculocutaneous innervate and contain

Answer 8

• C5 C6 C7

- goes into the anterior compartment of the arm and runs obliquely (anteriorly) through the forearm supplying it

Question 9

what does the median nerve innervate and contain

Answer 9

• C6 7 8 T1
• comes of the lateral and medial cords and has a lateral and medial head and supplies the elbow, radioulnar , wrist and thumb and half the ring finger

Question 10

what does the radial nerve supply and contain

Answer 10

• C 5 6 7 8 T1
• comes from the posterior cord and runs behind the humerus all the way along lateral boarder , superior to the lateral humorous epicondyle supplying the lateral cutaneous arm and the posterior forearm

Question 11

what does the ulnar nerve innervate and contain

Answer 11

T1 C8

-medial aspect of the arm and forearm and little finger half the ring finger

Question 12

• anterior compartment of the arm IN?
• posterior compartment ?
• shoulder?
• intrinsic hand i.e?
• lateral 2 lumbrical muscle =
• themar muscle =
• 2 medial lumbrical muscle =
• lateral half of the flexor digitorium =

Answer 12

• musculocutanous
• radial
• axillary
• lateral 2 lumbrical muscle = median
• thenar muscle = median
• 2 medial lumbrical muscle = ulnar
• lateral half of the flexor digitorium = median

Question 13

describe 3 nerves and their relation to bones

Answer 13

• AXILLARY comes from the lateral cord and runs posteriorly to the humerus head (surgical head)supply the major abductor deltoid muscle
• RADIAL comes off the posterior cord, runs posterior to the humorous then travels superior to the lateral epicondyle of the humerus and runs along the lateral aspect of the radius bone
• ULNAR comes for the medial cord runs medial to the humorous relatively and runs posterior the medial epicondyle along the ulna bone

Question 14

damage to the humerus bone affects what nerve (s)

Answer 14

• axillary
• ulnar
• radial