Flashcards in Axilla Deck (29)
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Apex of axilla
Is the cervico-axiallary canal, which is the passage way between the neck and the axilla
It is bounded by the first rib , clavicle, and superior edge of scapula
1
Base of the axilla
Formed by the concave skin, subcutaneous tissue, and axillary(deep) fascia extending from the arm to the thoracic wall forming the axillary fossa(armpit)
2
Anterior wall of axilla
Is formed by the pec major and minor and the pectoral and clavipectoral fascia
Anterior axillary fold is the most inferior part of the anterior wall
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Posterior wall of the axilla
Anteriorly formed by the scapula and subscapulari
inferiorly by lats and teres major
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Medial wall of axilla
Formed by the thoracic wall and the overlying serratus anterior
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Lateral wall of axilla
Is the narrow bony wall formed by the intertubercular sulcus of humerus
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Axillary artery (first part)
Located between lateral border of the first rib and the medial border of pec minor
It is enclosed in axillary sheath and has one branch: the superior thoracic artery
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Axillary artery(second part)
Lies posterior to the pectoralis minor and has 2 branches: the thoraco-acromial artery and lateral thoracic artery
8
Axillary artery(3rd part)
Extends from the lateral border of the pectoralis minor to the inferior border of the teres major and has 3 branches: the subscapular artery(largest), the anterior circumflex humeral artery, and posterior circumflex humeral artery
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Seperior thoracic artery
First part of axillary
Helps supply first and second intercostal spaces and superior part of Sarratus anterior
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Thoraco-acromial artery
2nd part of axillary
Divides into four branches: pectoral, deltoid, acromial, and clavicular
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Lateral thoracic artery
Second part of axillary
Supply lateral aspect of breast
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Circumflex humeral(posterior and anterior)
Third part of axillary
Encircle surgical neck of humerous, anastomosing with each other laterally; larger posterior branch traverses quadrangular space
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Subscapular artery
Third part of axillary artery
Descends from level of inferior border of subscapularis along lateral border of scapula, dividing within 2-3 cm into terminal branches, the circumflex scapular, and thoracodorsal arteries
14
Roots of the brachial plexus are ____ and begin_____
C5-t1 anterior rami
Lateral cervical region(posterior triangle)
Plexus- network of nerves ...innervating the upper limbs
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In the inferior part of the neck the roots of the brachial plexus unite to form______
3 trunks: superior, middle, and inferior
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Superior trunk of brachial plexus
From the union of c5 and c6 roots
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Middle trunk of the brachial plexus
Which is a continuation of the c7 root
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Inferior trunk of brachial plexus
From the union of c8 and t1 roots
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Anterior divisions of the trunks
Supply the anterior(flexor) compartments of the upper limb
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Posterior divisions of the trunks
Supply posterior(extensor) compartments of the upper limb
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Lateral cord of b.p.
Formed by the union of Anterior devisions of the superior and middle trunks
-1st branch of this is lateral pectoral nerve
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Medial cord of b.p.
Continuation of the anterior division of the inferior trunk
-1st medial pectoral nerve
-2nd medial cutaneous nerve of arm
-3rd medial cutaneous forearm
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Posterior cord of the b.p.
Formed by the union of all the posterior divisions of all 3 trunks
Behind the axillary artery
1st branch upper subscapular
2nd thoracodorsal nerve
3rd lower subscapular
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Axillary artery
Continuation of the subclavian artery
-first rib
Continues distally as brachial artery
-inferior border of teres major
3 parts
-divided by pec minor
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Subclavian artery stops where the axillary starts. Where is this?
Lateral border of 1st rib
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Terminal branches of lateral cord
Musculocutaneous n
Half of the median n
27
Terminal branches of posterior cord
Axillary n
Radial n
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