muscles of arm

Question 0

biceps brachii origin

Answer 0

short head: tip of coracoid process of scapula

long head: supraglenoid tubercle of scapula

Question 1

four armmuscles

Answer 1

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

Question 2

biceps brachii insertion

Answer 2

tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 3

biceps brachi innervation

Answer 3

musculocutaneous nerve

C5, C6

Question 4

biceps brachii main actions

Answer 4

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

Question 5

brachialis origin

Answer 5

distal half of anterior surface of humerus

Question 6

brachialis insertion

Answer 6

coronoid process and uberosit of ulna

Question 7

brachialis innervation

Answer 7

musculocutaneous nerve

C5, C6

Question 8

brachialis main actions

Answer 8

flexes elbow joint in all positions

Question 9

coracobrachialis origin

Answer 9

tip of coracoid process of scapula

Question 10

coracobrachialis insertion

Answer 10

middle third of medial surface of humerus

Question 11

coracobrachialis innervation

Answer 11

musculocutaneous nerve

C5, C6, C7

Question 12

coracobrachialis ction

Answer 12

helps flex and adduct shoulder joint, resists dislocation of shoulder

Question 13

triceps brachii origin

Answer 13

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

Question 14

triceps brachii insertion

Answer 14

proximal end of olecranon of ulna and fascia of forearm

Question 15

triceps brachii innervation

Answer 15

radial nerve

C6, C7, C8

Question 16

triceps brachii action

Answer 16

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

Question 17

anconeus origin

Answer 17

lateral epicondyle of humerus

Question 18

anconeus insertion

Answer 18

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

Question 19

anconeus innervation

Answer 19

radial nerve

C7, C8, T1

Question 20

anconeus main actions

Answer 20

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

Question 21

transverse humeral ligament

Answer 21

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

Question 22

bicipital aponeurosis

Answer 22

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

Question 23

what type of muscle is brachialis

Answer 23

fusiform

Question 24

additional function of brachialis

Answer 24

when elbow is extended slowly, steadies movement by slowly relaxing

Question 25

subtendinous olecranon bursa

Answer 25

between triceps tendon and olecranon, reduces friction