Muscles Of The Arm

Question 0

Insertion of biceps brachii

Answer 0

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 1

Origin of biceps brachii

Answer 1

Short head: tip of coracoid process of scapula

Long head: supraglenoid tubercle of scapula

Question 2

Innervation of biceps brachii

Answer 2

Musculocutaneous nerve (c5 and c6)

Question 3

Actions of biceps brachii

Answer 3

Supinates forearm and, when it is supinated, flexes elbow joint; flexes shoulder joint, short head resists dislocation of the shoulder

Question 4

Origin of brachialis

Answer 4

Distal half of anterior surface of humerus

Question 5

Insertion of brachialis

Answer 5

Coronoid process and tuberosity of ulna

Question 6

Innervation of brachialis

Answer 6

Musculocutaneous nerve (c5 and c6)

Question 7

Action of brachialis

Answer 7

Flexes elbow joint in all positions

Also steadies elbow extension by slowly relaxing

Question 8

Origin of coracobrachialis

Answer 8

Tip of coracoid process of scapula

Question 9

Insertion of coracobrachialis

Answer 9

Middle third of medial surface of humerus

Question 10

Innervation of coracobrachialis

Answer 10

Musculocutaneous nerve (c5, c6, c7)

Question 11

Action of coracobrachialis

Answer 11

Helps flex and adduct shoulder joint

Resists dislocation of shoulder

Question 12

Origin of triceps brachii

Answer 12

Long head: infraglenoid tubercle of scapula
Lateral head: posterior surface of humerus, superior to radial groove
Medial head: posterior surface of humerus, inferior ro radial groove

Question 13

Insertion of triceps brachii

Answer 13

Proximal end of olecranon of ulna and fascia of forearm

Question 14

Innervation of triceps brachii

Answer 14

Radial nerve (c6, c7, c8)

Question 15

Actions of triceps brachii

Answer 15

Chief extensor of elbow joint; long head extends shoulder joint and resists dislocation of humerus (especially important during abduction)

Question 16

Origin of anconeus

Answer 16

Lateral epicondyle of humerus

Question 17

Insertion of anconeus

Answer 17

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

Question 18

Innervation of anconeus

Answer 18

Radial nerve (c7, c8, t1)

Question 19

Actions of anconeus

Answer 19

Assists triceps in extending elbow joint, stabilizes elbow joint, abducts ulna during pronation

Question 20

What are the two types of movement that occur at the elbow joint?

Answer 20

Flexion-extension and pronation-supination

Question 21

The muscles of the arm are divided into two groups, what are they called and where are they located?

Answer 21

There are three flexors in the anterior compartment and one extensor in the posterior compartment with another muscle that assists in extension and pronation

Question 22

Which muscles of the arm are considered flexors?

Answer 22

Biceps brachii, brachialis, and coracobrachialis

Question 23

What arm muscles are considered extensors?

Answer 23

Triceps brachii and the anconeus (which helps out the triceps in extension)

Question 24

What is the bicipital aponeurosis?

Answer 24

A triangular membraneous band that runs from the biceps tendon across the cubital fossa and merges with the antebrachial fascia covering the flexor muscles in the medial side of the forearm