Cutaneous Nerves and Drainage Flashcards
What nerve supplies the arm laterally?
C5
What nerves supply the region at the base of the neck, extending laterally over the shoulder?
C3 and C4
What nerve supplies the forearm laterally and the thumb?
C6
What does dermatome C7 supply?
the middle and ring fingers (or the middle three fingers) and the middle of the posterior surface of the thumb
What does dermatome C8 supply?
the little finger, the medial side of the hand, and the forearm
What supplies the middle of the forearm to the axilla?
T1
What does dermatome T2 supply?
a small part of the arm and the skin of the axilla
What is the brachial plexus?
a major nerve network formed by the anterior rami of the C5-T1 spinal nerves
Most cutaneous nerves of the upper limb are derived from what?
brachial plexus
The cutaneous nerves to the shoulder are derived from what?
cervical plexus
What is the cervical plexus?
a nerve network consisting of series of nerve loops formed between adjacent anterior rami of the first four cervical nerves
What are the segments of the supraclavicular nerves?
C3 and C4
What does the supraclavicular nerves innervate?
the skin over clavicle and superolateral aspect of the pectoralis major
What are the segments of the posterior cutaneous nerve of the arm?
C5-C8
Which nerves are branches of the radial nerve?
posterior cutaneous nerve of the arm, posterior cutaneous nerve of the forearm, and inferior lateral cutaneous nerve of the arm
What does the posterior cutaneous nerve of the arm innervate?
the skin on the posterior surface of the arm
What are the segments of the posterior cutaneous nerve of the forearm?
C5-C8
What does the posterior cutaneous nerve of the forearm innervate?
the skin on the posterior surface of the forearm
What are the segments of the superior lateral cutaneous nerve of the arm?
C5 and C6
What nerve is the terminal branch of the axillary nerve?
superior lateral cutaneous nerve of the arm
What does the superior lateral cutaneous nerve of the arm innervate?
the skin over the lower part of the deltoid and on the lateral side of the midarm
What are the segments of the inferior lateral cutaneous nerve of the arm?
C5 and C6
What does the inferior lateral cutaneous nerve of the arm innervate?
the skin over the inferolateral aspect of the arm
What are the segments of the lateral cutaneous nerve of the forearm?
C6 and C7
What does the lateral cutaneous nerve of the forearm innervate?
the skin on the lateral side of the forearm
What nerve is the terminal branch of the musculocutaneous nerve?
lateral cutaneous nerve of the forearm
What are the segments of the medial cutaneous nerve of the arm?
C8-T2
From where does the medial cutaneous nerve of the arm and the forearm arise?
medial cord of the brachial plexus
What does the medial cutaneous nerve of the arm innervate?
the skin on the medial side of the arm
What nerve unites in the axilla with the lateral cutaneous branch of the 2nd intercostal nerve?
medial cutaneous nerve of the arm
What are the segments of the intercostobrachial nerve?
T2
The intercostobrachial nerve is a branch of what?
2nd intercostal nerve
What does the intercostobrachial nerve innervate?
skin on the medial surface of the arm
What are the segments of the medial cutaneous nerve of the forearm?
C8 and T1
What does the medial cutaneous nerve of the forearm innervate?
the skin on the anterior and medial surfaces of the forearm
What forms the floor of the axilla?
axillary fascia
What supports the axillary fascia and pulls it and the skin inferior to it upward during abduction of the arm?
suspensory ligament of axilla
What forms the base of the palmar aponeurosis?
superficial transverse metacarpal ligament
What are the main superficial veins of the upper limb?
cephalic and basilic veins
What forms communications between the superficial and deep veins?
perforating veins
Where do the cephalic and basilic veins originate?
subcutaneous tissue on the dorsum of the hand from the dorsal venous network
What are the main superficial veins of the upper limb?
cephalic and basilic veins
Where do the cephalic and basilic veins orginate?
subcutaneous tissue on the dorsum of the hand from the dorsal venous network
What are perforating veins?
form communications between superficial and deep veins
What is the course of the cephalic vein?
ascends along lateral wrist, forearm and arm, passes between the deltoid and the pectoralis major (deltopectoral groove), and enters the clavipectoral triangle
Where does the cephalic vein terminate?
axillary vein
What is the course of the median cubital vein?
communicates with the cephalic vein anterior to the elbow, passes obliquely across anterior elbow, and joins basilic vein
What is the course of the basilic vein?
ascends along medial forearm, runs parallel to brachial artery, and merges with accompanying veins of brachial artery to form the axillary vein
