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Flashcards in muscles of arm Deck (26):
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four armmuscles

three flexors: biceps brachii, coracobrachialis, brachialis: in anterior compartment and supplied by musculocutaneous nerve
one extensor: triceps brachii: posterior compartment, radial nerve
small triangular muscle on posterior aspect of elbow: anconeus

1

biceps brachii origin

short head: tip of coracoid process of scapula
long head: supraglenoid tubercle of scapula

2

biceps brachii insertion

tuberosity of radius and fascia of forearm via bicipital aponeurosis

3

biceps brachi innervation

musculocutaneous nerve
C5, C6

4

biceps brachii main actions

supinates forearm and when it is supinated, flexdes elbow joint
flexes shoulder joint, short head resists dislocation of shoulder

5

brachialis origin

distal half of anterior surface of humerus

6

brachialis insertion

coronoid process and uberosit of ulna

7

brachialis innervation

musculocutaneous nerve
C5, C6

8

brachialis main actions

flexes elbow joint in all positions

9

coracobrachialis origin

tip of coracoid process of scapula

10

coracobrachialis insertion

middle third of medial surface of humerus

11

coracobrachialis innervation

musculocutaneous nerve
C5, C6, C7

12

coracobrachialis ction

helps flex and adduct shoulder joint, resists dislocation of shoulder

13

triceps brachii origin

long head: infraglenoid tubercle of scapula
lateral head: posterior surface of humerus, superior to radial groove
medial head: posterior surface of humerus, inferior to radial groove

14

triceps brachii insertion

proximal end of olecranon of ulna and fascia of forearm

15

triceps brachii innervation

radial nerve
C6, C7, C8

16

triceps brachii action

chief extensor of elbow joint
long head extends shoulde joint nd resists dislocation of humerus
especially impt during abduction

17

anconeus origin

lateral epicondyle of humerus

18

anconeus insertion

lateral surface of olecranon and superior part of posterior surface of ulna

19

anconeus innervation

radial nerve
C7, C8, T1

20

anconeus main actions

assists triceps in extending elbow joint; stabilizes elbow joint; abducts ulna during pronation

21

transverse humeral ligament

broad band that passes from less to greater tubercle of humerus and converts intertubercular groove into canal for tendon of long head of biceps

22

bicipital aponeurosis

runs from biceps tendon across cubital fossa and merges with ntebrachial (deep) fascia, covering flexor muscles in medial side of forearm

23

what type of muscle is brachialis

fusiform

24

additional function of brachialis

when elbow is extended slowly, steadies movement by slowly relaxing

25

subtendinous olecranon bursa

between triceps tendon and olecranon, reduces friction