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ANAT 392 - Meag > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

Brachial plexus is made by ____ rami of ____

A

ventral

C5-T1

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2
Q

Other spinal nerves which contribute to the brachial plexus (other than C5-T1)

A

C4 and T2

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3
Q

Between what muscles is the brachial plexus formed

A

Anterior and middle scalene muscles

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4
Q

What are the 2 branches of the brachial plexus

A

supra-clavicular branches

infra-clavicular branches

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5
Q

The supra-clavicular branches arise from…

A

roots or trunks of the plexus

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6
Q

Infra-clavicular branches arise from….

A

the cords of the plexus

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7
Q

____% of the normal population have brachial pelxi that are…

A

embedded in the anterior scalene

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8
Q

Roots and trunks are located….

A

in the posterior neck triangle (posterior to SCM)

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9
Q

Divisions of the brachial plexus are sitting …

A

immediately behind the clavicle

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10
Q

Cords of the brachial plexus are found…

A

below the clavicle in the axilla

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11
Q

The lateral cord is comprised of which trunks?

A

Upper and middle

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12
Q

The posterior cord is comprised of which trunks?

A

Upper
Middle
lower

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13
Q

The medial cord is comprised of which trunks?

A

Lower

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14
Q

Which roots create the upper trunk

A

C5, C6

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15
Q

Which roots create the middle trunk

A

C7

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16
Q

Which roots create the lower trunk

A

C8, T1

17
Q

What nerves branch off C5 before it becomes the upper trunk

A

Nerve to scalenei
Dorsal scapular
Long thoracic

18
Q

What nerve branches occur off the upper trunk

A

Suprascapular

Nerve to subclavius

19
Q

Posterior cord branches

A 
Upper subscapular 
Thoracodorsal 
Lower subscapular 
Axillary 
Radial
20
Q

Suprascapular and nerve to subclavius (which branch off the upper trunk) are motor or sensory or mixed?

A

motor

21
Q

Are the lateral and medial pectoral nerves motor, sensory, or mixed?

A

motor

22
Q

is the long thoracic nerve motor, sensory, or mixed? what does it supply?

A

motor

serratus anterior

23
Q

What does the dorsal scapular nerve supply?

A

Rhomboids and levator scap

24
Q

is the ulnar nerve motor, sensory, or mixed?

A

mixed

25
Q

What is the name for upper trunk brachial plexus injuries?

A

Erb’s palsy

26
Q

What is Erb’s palsy and how does it look?

A

Post the movements of the shoulder along with flexion of elbow and extension of wrist joint is lost
Waiters position - med rotation of shoulder, flexion of wrist, extension of the elbow

27
Q

How does Erb’s palsy or upper trunk brachial plexus injuries occur?

A

Any injury causing an sudden increase in the angle between the neck and shoulder

28
Q

What are lower trunk brachial plexus lesions called?

A

Klumkes palsy

29
Q

What is Klumkes palsy and how does it appear?

A

Involves C8-T1, usually flexor muscles of the wrist and fingers plus intrinsic mucles of the hand will be affect.

30
Q

What does Klumkes palsy or injuries to the lower trunk of the brachial plexus occur?

A

Often seen in falling accidents when the person tries to hang on to avoid falling

31
Q

When does the axillary artery begin? end?

A

Lateral broder of 1st rib

Lower border of teres major

32
Q

Where is the superior part of the axillary artery? how many branches does it have?

A

Superior to muscle

1 branch

33
Q

Where is the Posterior part of the axillary artery? how many branches does it have?

A

Behind muscles

2 branches

34
Q

how many branches does the inferior part of the axillary artery have?

A

3

35
Q

What is the branch of the superior part of the axillary artery?

A

Superior thoracic

36
Q

What are the branches of the posterior part of the axillary artery?

A

Thoracoacromial

Lateral thoracic

37
Q

What do the branches of the posterior part of the axillary artery supply?

A

Serratus anterior muscle

38
Q

What are the branches of the inferior part of the axillary artery?

A

Subscapular
Anterior circumflex humeral
Posterior circumflex humeral

39
Q

What does the axillary artery become at the lower border of the teres major

A

brachial artery

ANAT 392 - Meag (18 decks)

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