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Flashcards in Arm + Axilla Deck (21):
1

how many muscles are in the posterior compartment?

one - triceps brachii

2

what are the loose major functions of the two compartments?

posterior = extensor
anterior = flexor

3

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

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

4

what is the action and innervation of triceps brachii?

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

5

how many muscles are in the anterior compartment?

3 (BBC) - biceps / brachialis / coracobrachialis

6

which nerve innervates the anterior compartment muscles?

musculocutaneous

7

what is the main action of biceps brachii?

supination of forearm when flexed at elbow
also flexes @ arm and shoulder

8

what forms the roof of the cubital fossa?

bicipital aponeurosis

9

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

radial tuberosity

10

what is the action of the coracobrachialis?

flexor @ shoulder

11

what is the action of the brachialis?

main flexor @ elbow

12

which muscle forms the base of the cubital fossa?

brachialis

13

what makes up the anterior border of the axilla?

pectoralis major and minor

14

what makes up the medial border of the axilla?

serratus anterior and thoracic wall

15

what makes up the posterior border of the axilla?

scapularis, teres major, lattissimus dorsi

16

what makes up the lateral border of the axilla?

bicipital groove on the humerus

17

what are the 3 pathways exiting the axilla?

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

what passes through the quadrangular space?

axillary nerve and posterior circumflex humeral artery

19

what passes through the clavipectoral triangle?

cephalic vein enters, medial and lateral pectoral nerves leave

20

what 3 structures border the clavipectoral triangle?

pectoralis major, deltoid and clavicle

21

name the contents of the axilla (6 structures)

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