Flashcards in Nerve and blood supply to the upper limb Deck (87):
Which artery begins the blood supply to the upper limb?
Where does the right subclavian artery come from?
Where does the left subclavian artery come from?
Arch of the aorta
Where does the subclavian artery pass?
Passes through the scalene triangle over the first rib
Which muscle divides the subclavian artery?
List the parts of the subclavian artery
1st - medial to scalenus anterior
2nd - behind scalenus anterior
3rd - lateral to scalenus anterior
Name some arteries which branch from the 1st part of the subclavian artery
Name an artery which branches from the 2nd or 3rd part of the subclavian artery
Dorsal scapular artery
What does the dorsal scapular artery contribute to?
What does the thyrocervical trunk contribute to?
Where does the thyrocervical trunk go?
To thyroid, cervical and scapular
Where does the subclavian artery end?
As it crosses the border of the 1st rib
What does the subclavian artery become after it passes the border of the 1st rib?
Which muscle divides the axillary artery into 3 parts?
List the 3 parts of the axillary artery
1st - medial to pectoralis minor
2nd - Behind pectoralis minor
3rd - Lateral to pectoralis minor
What are the 1st and 2nd parts of the axillary artery closely associated with?
Where does the axillary artery end?
Lower border of teres minor
What does the axillary artery become?
Which artery is a branch of the 3rd part of the axillary artery?
What does the subscapular artery form?
What is the risk of a surgical fracture to the humerus?
Trauma to the anterior and posterior circumflex humeral to neck/shaft of humerus
Where is the brachial artery located in the arm?
What does the brachial artery supply?
Name the large branch of the brachial artery
Profunda brachii artery
What does the brachial artery contribute to?
Anastomosis around the elbox
Where does the brachial artery divide?
What does the brachial artery split into?
Radial artery (lateral)
Ulnar artery (medial)
What does profunda brachii artery supply?
Where is the profunda brachii artery located?
What does the profunda brachii accompany?
What can fracture to the humerus cause?
Trauma to profunda brachii artery
Describe the size of the radial artery in comparison to ulnar
Which muscle covers the radial artery?
What does the radial artery form?
Deep palmar arch
What happens to the radial artery at the wrist?
Winds around to dorsum of hand
Through anatomical snuffbox
Pierces first dorsal interosseous muscle
Where is the deep palmar arch located?
Below flexor tendons
Which muscle covers the ulnar artery?
Flexor carpi ulnaris
Name the deep branch of the ulnar artery
Common interosseous artery
What does the ulnar artery form?
Superficial palmar arch
Where is the superficial palmar arch located?
Above flexor tendons
Name the arteries surrounding each finger
Palmar digital arteries
Where does venous blood drain?
Axillary vein and subclavian vein
Describe the venous return in upper limb
Describe deep veins
Name the superficial veins
Cephalic (lateral forearm)
Basilic (medial forearm)
Where are the superficial veins from?
Dorsal venous arch
Where do the cephalic and basilic veins drain?
Describe the number of lymph nodes in the upper limb
Where does lymph drain?
Name the 3 nodes in the upper limb
Which vein is located by the deltopectoral node?
Which vein is located by the cubital node?
What is the brachial plexus?
Nerve supply to upper limb
What does the brachial plexus carry?
Motor, sensory and sympathetic axons
What does the brachial plexus produce?
Mixed nerves (contains axons from multiple spinal nerves)
What is the brachial plexus divided into?
What are roots?
Roots are ventral primary rami of C5-T1
What does the dorsal scapular nerve supply?
What does the long thoracic nerve supply?
To serratus anterior
Describe the motor innervation of the upper limb?
Motor axons within each root innervate a different functional group of muscles (myotomes)
What does C5 do?
Shoulder abduction and adduction
What does C6/C7 do?
What does C7/C8 do?
What does C8/T1 do?
Movement of digits
What do roots form?
Where do trunks pass?
Through the scalene triangle
What does each trunk divide into?
Anterior and posterior division
Describe the anterior division
Axons to flexor compartments
What does the anterior division form?
Lateral and medial cords
What does the posterior division form?
Describe the posterior division
Axons to extensor compartments
Where are the cords located?
Under pectoralis minor
What are the cords related to?
Name the 3 divisions of cord in relation to axillary artery
What does the lateral cord terminate as?
Lateral part of median nerve
What is the motor and sensory function of the musculocutaneous nerve
Motor - Anterior arm
Sensory - Lateral forearm
What does the medial cord terminate as?
Medial part of median nerve
What is the motor and sensory function of the median nerve
Motor - anterior forearm and lateral hand
Sensory - Lateral palm of the hand, d123 and half 4
What is the motor and sensory function of the ulnar nerve?
Motor - medial side anterior forearm and hand
Sensory - medial hand and half d4 and d5
What does the posterior cord terminate as?
What is the motor and sensory function of the radial nerve?
Motor - posterior arm and posterior forearm
Sensory - Posterior arm and posterior forearm and lateral dorsum hand
What is the motor and sensory function of the axillary nerve?
Motor - deltoid muscle and teres minor
Sensory - Badge area of arm
What is a dermatome?
An individual area of skin innervated by a single spinal nerve
When are dermatomes established?
What is the clinical significance of dermatomes?
Altered sensation in the region of a dermatome indicates damage to specific spinal nerve of spinal cord segment (i.e. proximal nerve injury)
What do terminal branches contain?
axons from multiple spinal nerve