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Human Anatomy Exam III > Axilla & Brachial Plexus > Flashcards

Axilla & Brachial Plexus Flashcards

1
Q

What makes up the anterior wall of the axilla?

A

Pectoralis Major and Minor

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2
Q

What makes up the posterior wall of the axilla?

A

Latissimus Dorsi, Teres Major, and subscapularis

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3
Q

What makes up the medial wall of the axilla?

A

Serratus anterior

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4
Q

What makes up the lateral wall of the axilla?

A

Intertubercular sulcus of humerus

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5
Q

What makes up the base of the axilla?

A

Skin and fascia of armpit

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6
Q

What is contained within the axilla?

A

Fat & connective tissue, axillary v & lymphatics (outside sheath), cutaneous nerves, axillary sheath (axillary a & brachial plexus)

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7
Q

What are the five principal lymph node groups?

A

Humeral (lateral), pectoral (anterior), subscapular (posterior) drain to central node, which drains to apical node

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8
Q

What branch comes off the first part of axillary artery?

A

Superior thoracic artery

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9
Q

What branches come off the second part of axillary artery?

A

Thoracoacromial and lateral thoracic aa

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10
Q

What branches come off the third part of axillary artery?

A

Subscapular, anterior, and posterior circumflex humeral aa

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11
Q

Where do the rami of the brachial plexus emerge? How many are there?

A

5 emerge in upper neck

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12
Q

Where do the trunks of the brachial plexus form? How many are there?

A

3 form in lower neck

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13
Q

Where do the divisions of the brachial plexus split? How many are there?

A

6 split off behind clavicle

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14
Q

Where do the cords of the brachial plexus form? How many are there?

A

3 form in the axillary region

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15
Q

Where do the branches of the brachial plexus split? How many are there?

A

5 split off in upper arm

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16
Q

What muscle does musculocutaneous n pass through?

A

Corachobrachialis

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17
Q

What muscles does musculocutaneous n enter?

A

Biceps brachii and brachialis

18
Q

What kind of innervation is musculocutaneous n providing?

A

Motor and sensory

19
Q

What does median nerve innervate?

A

Most of the anterior forearm, 3 thenar eminence mm, and first 2 lumbricals in hand

20
Q

Where does ulnar nerve run?

A

Behind medial epicondyle

21
Q

What does ulnar nerve innervate?

A

Most of the mm of the hand, FCU m, and ulnar half of FDP m in forearm

22
Q

Where does axillary nerve run?

A

Circles behind humerus in quadrangular space

23
Q

What does axillary nerve innervate?

A

Deltoid and teres minor mm

24
Q

Where does radial nerve run?

A

Passes posterior to humerus in radial groove and within triangular interval

25
Q

What does radial nerve innervate?

A

All muscles in both regions & half of brachial is m

26
Q

What nerves make up the upper plexus?

A

Dorsal scapular nerve, long thoracic nerve, and supra scapular nerve

27
Q

Where does dorsal scapular nerve originate? What does it innervate?

A

C5; rhomboid & levator scapulae mm

28
Q

Where does long thoracic nerve originate? What does it innervate?

A

C5-C7; serratus anterior

29
Q

Where does suprascapular nerve originate? What does it innervate?

A

C5-C6; supraspinatus & infraspinatus

30
Q

What are the pectoral nerves?

A

Lateral and medial pectoral nn

31
Q

Where does lateral pectoral n originate? What does it innervate?

A

C5-C7; pectoralis major m

32
Q

Where does medial pectoral n originate? What does it innervate?

A

C8-T1; pectoralis major & minor mm

33
Q

What nerves make up the lower plexus?

A

Upper subscapular, thoracodorsal, and lower subscapular nn

34
Q

Where does upper subscapular n originate? What does it innervate?

A

C5-C6; subscapularis m

35
Q

Where does thoracodorsal n originate? What does it innervate?

A

C6-C8; latissimus dorsi m

36
Q

Where does lower subscapular n originate? What does it innervate?

A

C5-C6; subscapularis and teres major mm

37
Q

What additional nerves are in the brachial plexus?

A

Nerve to subclavius, medial brachial cutaneous n, medial antibrachial cutaneous n

38
Q

Where does nerve to subclavius originate? What does it innervate?

A

C5-C6; subclavius m

39
Q

Where does medial brachial cutaneous n originate? What does it innervate?

A

C8-T1; sensory to medial arm

40
Q

Where does medial anti brachial cutaneous n originate? What does it innervate?

A

C8-T1; sensory to medial forearm

41
Q

No nerves come directly off of which part of the brachial plexus?

A

Divisions

Human Anatomy Exam III (5 decks)

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