Arm + Axilla Flashcards Preview

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Flashcards in Arm + Axilla Deck (21)
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1
Q

how many muscles are in the posterior compartment?

A

one - triceps brachii

2
Q

what are the loose major functions of the two compartments?

A
posterior = extensor
anterior = flexor
3
Q

name the three heads of the triceps, and where their joint tendon inserts

A

long, lateral and medial (medial deepest, covered by the other two)
insert onto olecranon of ulna

4
Q

what is the action and innervation of triceps brachii?

A
radial nerve (C6-8, mainly C7)
extension @ elbow
5
Q

how many muscles are in the anterior compartment?

A

3 (BBC) - biceps / brachialis / coracobrachialis

6
Q

which nerve innervates the anterior compartment muscles?

A

musculocutaneous

7
Q

what is the main action of biceps brachii?

A

supination of forearm when flexed at elbow

also flexes @ arm and shoulder

8
Q

what forms the roof of the cubital fossa?

A

bicipital aponeurosis

9
Q

what do the two heads of the biceps combine to attach to?

A

radial tuberosity

10
Q

what is the action of the coracobrachialis?

A

flexor @ shoulder

11
Q

what is the action of the brachialis?

A

main flexor @ elbow

12
Q

which muscle forms the base of the cubital fossa?

A

brachialis

13
Q

what makes up the anterior border of the axilla?

A

pectoralis major and minor

14
Q

what makes up the medial border of the axilla?

A

serratus anterior and thoracic wall

15
Q

what makes up the posterior border of the axilla?

A

scapularis, teres major, lattissimus dorsi

16
Q

what makes up the lateral border of the axilla?

A

bicipital groove on the humerus

17
Q

what are the 3 pathways exiting the axilla?

A

main one is straight into the upper limb.
quadrangular space - gap in posterior wall of axilla, access to posterior arm and shoulder area
clavipectoral triangle - opening in anterior wall

18
Q

what passes through the quadrangular space?

A

axillary nerve and posterior circumflex humeral artery

19
Q

what passes through the clavipectoral triangle?

A

cephalic vein enters, medial and lateral pectoral nerves leave

20
Q

what 3 structures border the clavipectoral triangle?

A

pectoralis major, deltoid and clavicle

21
Q

name the contents of the axilla (6 structures)

A
axillary artery (medial and posterior parts)
axillary vein
brachial plexus
corachobrachialis
biceps brachii
axillary lymph nodes