muscles of the arm

Question 1

The intermuscular septa of the arm divide it into…

Answer 1

Anterior + posterior compartments

Question 2

The anterior compartment of the arm contains…

Answer 2

The flexors

Question 3

The posterior compartment of the arm contains…

Answer 3

The extensors

Question 4

Name the flexors of the arm

Answer 4

Coracobrachialis, brachialis + biceps brachii

Question 5

Name the extensors of the arm

Answer 5

Triceps

Question 6

The lateral intermuscular septum is perforated by…

Answer 6

The brachial artery + radial nerve

Question 7

The medial intermuscular septum is perforated by…

Answer 7

The ulnar nerve

Question 8

The coracobrachialis originates in…

Answer 8

The coracoid process of the scapula

Question 9

The coracobrachialis inserts into…

Answer 9

The anteroproximal portion of the humeral shaft

Question 10

Nerve that innervates all the muscles in the anterior compartment

Answer 10

Musculocutaneous

Question 11

Nerve that innervates the extensors in the arm

Answer 11

Radial nerve

Question 12

Origin of the brachialis

Answer 12

Anterior portion of distal humeral shaft

Question 13

Where does the brachialis insert?

Answer 13

Into the tuberosity of the ulna

Question 14

Function of the coracobrachialis

Answer 14

Shoulder flexion (elevation)

Question 15

Function of the brachialis

Answer 15

Elbow flexion

Question 16

Muscle with 2 heads that inserts into the bicipital tuberosity of the radius

Answer 16

Biceps brachii

Question 17

The long head of the biceps originates in…

Answer 17

The supraglenoid tubercle

Question 18

The short head of the biceps originates in…

Answer 18

The coracoid process

Question 19

Function of the biceps

Answer 19

Mainly supination, also flexion

Question 20

… of the elbow works best when done at the same time as supination

Answer 20

Flexion

Question 21

Name the 3 heads of the triceps

Answer 21

Long, medial and lateral

Question 22

The long head of the triceps originates in…

Answer 22

The infraglenoid tubercle

Question 23

The medial head of the triceps is…

Answer 23

The deepest one

Question 24

The medial head of the triceps originates in…

Answer 24

The posteromedial portion of the humeral shaft, distal to the radial groove

Question 25

The lateral head of the triceps originates in…

Answer 25

The posterolateral portion of the humeral shaft, proximal to the radial groove

Question 26

2 of the 3 tendons of the triceps fuse. Name them

Answer 26

Medial + lateral heads

Question 27

Site of insertion of the triceps

Answer 27

Olecranon

Question 28

Main vessel irrigating the arm

Answer 28

Brachial artery

Question 29

Where does the brachial artery end?

Answer 29

In the cubital fossa (anteromedially to the neck of the radius)

Question 30

Where do you place the stethoscope to measure blood pressure (in the arm)? Why?

Answer 30

In the anteromedial region, proximal to the elbow skinfold.

Because of the trajectory of the brachial artery (first medial + then anterior to the humerus)

Question 31

Where does the radial artery originate?

Answer 31

In the cubital fossa (anteromedially to the neck of the radius)

Question 32

Muscle that covers the radial artery in the forearm

Answer 32

Brachioradialis

Question 33

Vessel that, once it reached the wrist, divides into a main branch (surrounding the trapezius + entering the palm), forming the deep palmar arch

Answer 33

Radial artery