nerve and blood supply of the upper limb
DESCRIPTION
This material was developed for use by students of OTPT 102, AY 09-10, College of Allied Medical Professions, University of the Philippines, Manila. Please obtain permission before use.TRANSCRIPT
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This material was developed This material was developed for use by students of OTPT 102, AY 09-10, College of Allied Medical Professions, University of the Philippines, Manila. Please obtain permission before use.
Enrico C. Aguila, OTRPAugust 7, 2009
OTPT 102: Applied Anatomy and KinesiologyCollege of Allied Medical ProfessionsUniversity of the Philippines Manila
Nerve and Blood Supply of the Upper
Extremities
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Learning Objectives:
At the end of the SGD and didactics, the student should be able to:
Describe brachial plexus in terms of:– Roots, trunks, divisions, cords and branches– Pathway– Motor distribution – Sensory distribution
Describe the arterial and venous circulation of the upper extremity in terms of:– Vessels– Pathway– Distribution– Function
Describe the lymphatic circulation of the upper extremity.
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Brachial Plexus - Collection of nerves that enter the upper extremities
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Lies partly in the neck and partly in the axilla
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Gives rise to the nerves that innervate the UE
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Functions
Sensory innervation of skin and deep structures such as joints
Motor innervation of the muscles of the UE
Influence over the diameters of the blood vessels by the sympathetic vasomotor nerves
Sympathetic secretomotor supply to the sweat glands
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Parts
Really Tired? Drink Coffee Buddy!
R = ROOTS (ventral rami) (5)T = TRUNKS (3)D = DIVISIONS (2)C = CORDS (3)B = BRANCHES (Many!!)
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Nerve roots
C5
C6
C7
C8
T1
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Trunks (formed by the roots in the neck)
C5
C6
C7
C8
T1
Upper Middle
Lower
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Divisions (neck)
Upper
Middle
Lower
TRUNKS DIVISIONSAnterior
Anterior
Anterior Posterior
Posterior
Posterior
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Cords – formed by the joining of the divisions in the axilla
T D CORDS
U
M
L
A
A
A
P
P
P
Lateral
Medial
Posterior
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Cords – give off branches (axilla)
Lateral
Medial
Posterior
Musculocutaneous
Median
Ulnar
Axillary
Radial
Thoracodorsal
Upper and lowerSubscapular
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C5
C6
C7
C8
T1
MC
M
U
R
Ax
LTN
DSNSupSN
LPN
USSN
TDN
LSSN
MP
MBC
MABC
Upper
Middle
Lower
Anterior
Ante
rior
Anterior
Posterior
PosteriorPost
eri
or
Posterior
Lateral
Medial
Brachial Plexus
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Nerves of the Brachial Plexus
RootsDorsal scapular (C5)Long thoracic (C5, C6, C7)
Upper trunkNerve to subclavius (C5, C6)Suprascapular
Lateral CordLateral pectoral MusculocutaneousLateral root of median nerve
Medial Cord
Medial pectoralMedial cutaneous nerve of armMedial cutaneous nerve of forearmUlnar Medial root of median
Posterior Cord
Upper subscapularLower subscapularThoracodorsalAxillaryRadial
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Dorsal scapular (C5)
Rhomboids minorRhomboids major
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Long thoracic C5, C6, C7
Serratus anterior
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Nerve to subclavius C5, C6
SubclaviusMay give branch to the phrenic nerve (accessory phrenic nerve)
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Suprascapular C5, C6
Supraspinatusinfraspinatus
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Lateral pectoral C5, C6, C7
Pectoralis major
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Medial pectoral
Pectoralis majorPectoralis minor
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Musculocutaneous C5, C6, C7
CoracobrachialisBrachialisBiceps
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Upper subscapular C5, C6
Subscapularis
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Lower subscapular C5, C6
SubscapularisTeres major
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Thoracodorsal C6, C7, C8
Latissimus dorsi
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Medial cutaneous nerve of arm
Skin on medial side of distal one third of arm
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Medial cutaneous nerve of forearm
Skin on medial side of forearm
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Axillary C5, C6
Motor–Teres minor–Deltoid
Sensory–Skin over lateral part
of upper arm
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Radial C5, C6, C7, C8, T1
Motor•Triceps•Anconeus•Small part of brachialis•Brachioradialis•ECRL•ECRB•Supinator•EDC•EDM•ECU•EPL•APL•EPB•EIP
Sensory•Posterior aspect of the arm•Posterior aspect the forearm•Lower lateral aspect of the arm•Dorsal lateral surface of the hand
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Median nerve C5, C6, C7, C8, T1
Motor•Pronator teres•FCR•PL•FDS•FPL•FDP 1 and 2•Pronator quadratus•OP•FPB•APB•Lumbricales 1 and 2
Sensory
•Palmar side of lateral 3 ½ fingers•Lateral side of palm•Lateral side of wrist
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Ulnar C8, T1
Motor•Abductor Digiti Minimi•Adductor Pollicis•Dorsal Interossei•Flexor Carpi Ulnaris•Flexor Digiti Minimi•Flexor Digitorum Profundus (Med. 2)•Flexor Pollicis Brevis (Med.)•Lumbricals (Med. 2)•Opponens Digiti Minimi•Palmar Interossei
Sensory•Palmar surface of medial 1 ½ fingers •Medial palm and wrist•Dorsal surface of medial 1 ½ fingers
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Innervation of Joints
SHOULDER AXILLARY
ELBOW ULNAR
WRIST RADIAL, MEDIAN, ULNAR
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Sensorty innervation of the UE
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Sensory innervation of the hand
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Arterial supply of the UE
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Subclavian artery
Passes laterally deep to the clavicle.
Becomes the axillary artery as it passes into the axillary region.
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Axillary artery
Starts at the lateral border of the first rib, as a continuation of the subclavian, and ends at the lower border of the axilla (i.e. the lower border of teres major) to become the brachial artery
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Branches of the axillary
1st part:
• superior thoracic artery
2nd part:
• acromiothoracic trunk• lateral thoracic artery
3rd part:
• subscapular artery• anterior circumflex humeral artery• posterior circumflex humeral artery
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First Part of the Axillary Artery
between the lateral border of the first rib and the superior border of the pectoralis minor muscle
enclosed in the axillary sheath along with the axillary vein.
has only one branch, the supreme thoracic artery.
This artery helps to supply the first two intercostal spaces and the superior part of the serratus anterior muscle.
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Second Part of the Axillary Artery
This part of the artery lies deep to the pectoralis minor muscle.
The lateral, medial and posterior cords of the brachial plexus are so named respective to this part of the axillary artery.
This part of the axillary artery has two branches, the thoracoacromial and lateral thoracic arteries.
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The Thoracoacromial Artery
This is a short, wide trunk that arises from the axillary artery deep to the pectoralis minor muscle.
It pierces the costocoracoid membrane, which is part of the clavipectoral fascia.
It then divides into 4 branches (acromial, deltoid, pectoral, and clavicular) deep to the clavicular head of the pectoralis major muscle.
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The Lateral Thoracic Artery
This nerve descends along the axillary border of the pectoralis minor muscle.
It supplies the pectoral muscles and the axillary lymph nodes.
The lateral thoracic artery is large in women, and is an important source of blood to the lower part of the mammary glands.
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Third Part of the Axillary Artery
This part extends from the inferior border of the pectoralis minor muscle to the inferior border of the teres major muscle.
It has three branches, the anterior and posterior circumflex humeral arteries and the subscapular artery.
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Circumflex Humeral Arteries
These arteries pass around the surgical neck of the humerus and anastomose with each other.
The anterior circumflex humeral artery passes laterally, deep to the coracobrachialis and the biceps brachii muscles.
It gives off an ascending branch that supplies the shoulder, but the main artery winds around the surgical neck of the humerus.
The larger posterior circumflex humeral artery passes through the posterior wall of the axilla through the quadrangular space.
It is accompanied by the axillary nerve to supply the surrounding muscles.
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The Subscapular Artery
This is the largest branch of the axillary artery. It descends along the lateral border of the subscapularis muscle and divides into the circumflex scapular artery and the thoracodorsal artery.
The circumflex scapular artery passes around the lateral border of the scapula to supply muscles on the dorsum of the scapula.
The thoracodorsal artery continues the general course of the subscapular artery to supply adjacent muscles, principally, the latissimus dorsi muscle.
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Subclavian A.
Axillary A.
3rd Axillary A.
2nd Axillary A.
1st Axillary A.
Superior thoracic A.
Thoracoacromial A.
lateral thoracic A.
Subscapular A.
anterior circumflex humeral A
posterior circumflex humeral A
Axillary Artery
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Brachial artery
This artery begins at the inferior border of the teres major muscle as the continuation of the axillary artery.
It runs inferiorly and slightly laterally on the medial side of the biceps brachii muscle to the cubital fossa, where it ends opposite the neck of the radius.
It is superficial and palpable throughout its whole length.
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At first it lies medial to the humerus and then anterior to it.
It lies anterior to the triceps brachii and brachialis muscles, and is overlapped by the biceps brachii and coracobrachialis muscles.
It accompanies the median nerve, which crosses it anteriorly at the middle of the arm.
Under the cover of the bicipital aponeurosis, the brachial artery divides into the radial and ulnar arteries.
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Branches of the brachial artery
The brachial artery gives rise to many unnamed muscular branches, mainly from its lateral side.
The named branches of the brachial artery are the profunda brachii artery, the nutrient humeral artery, and the ulnar collateral arteries (superior and inferior).
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Profunda Brachii Artery
This is the largest branch of the brachial artery, and has the most superior origin.
It accompanies the radial nerve in its posterior course in the radial groove.
Posterior to the humerus, the profunda brachii artery (or deep brachial artery) divides into anterior and posterior ascending branches.
These help form the arterial anastomoses of the elbow region.
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Ulnar collateraal arteries
Superior Ulnar Collateral ArteryThis arises from the brachial artery near the middle of the arm.
It accompanies the ulnar nerve posterior to the medial epicondyle of the humerus.
Here, it anastomoses with the posterior ulnar recurrent branch of the ulnar artery and the inferior ulnar collateral artery.
Inferior Ulnar Collateral Artery
This arises from the brachial artery about 5 cm proximal to the elbow crease.
It then passes inferomedially, anterior to the medial epicondyle of the humerus.
Here, it joins the anastomoses of the elbow region.
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Branches of the brachial artery
profunda (accompanying the radial nerve);superior ulnar collateral (accompanying the ulnar nerve);
nutrient (to the humerus); inferior ulnar collateral.
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Radial and ulnar arteries
brachial artery bifurcates proximal to the cubital fossa into the radial and ulnar arteries.
supply the blood to the forearm and a portion of the hand and digits.
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Radial artery
The radial artery courses down the lateral side of the arm where it sends many small branches to the forearm.
The radial recurrent artery is the first and largest major branch of the radial artery which serves the region of the elbow.
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Ulnar artery
The ulnar artery extends down the ulnar side of the forearm and serves the medial side of the forearm through many small branches.
The first large branch of the ulnar nerve is the ulnar recurrent artery which arises from the proximal portion near the elbow.
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Veins of the Upper extremityNote: The veins of the upper extremity are classified as either deep or superficial veins. The superficial veins are highly variable and form an extensive network just below the skin. The deep veins accompany the arteries of the same region and bear similar names. A brief summary of the two types of veins follows.
Deep Veins of the Upper Extremity The radial vein on the lateral side of the forearm and the ulnar vein on the medial side drain blood form the deep and superficial palmar arches of the hand. The radial and ulnar veins join in the cubital fossa to form the brachial vein which continues up the medial side of the brachium. The brachial then becomes the axillary vein draining portion of the biceps and trips. Finally the axillary vein becomes the subclavian vein.
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Superficial Veins of the Upper Extremity The main superficial vessels of the upper extremity are the basilic and cephalic veins. The basilic vein passes on the ulnar side of the forearm and the medial side of the arm. Near the head of the humerus, the basilic vein merges with the brachial vein and forms the axillary vein. The cephalic vein drains the superficial portion of the hand and forearm on the radial side and continues p the lateral side of the arm. In the shoulder region the cephalic vein pierces the fascia and joins the axillary vein. Another portion of the superficial vein is the median vein. It ascends from the cephalic vein on the lateral side to connect with the basilic vein on the medial side.
Superficial Veins Deep Veins
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