Arm

Question 1

What nerve pierces the medial intermuscular septum?

Answer 1

Ulnar nerve

Question 2

What nerve pierces the lateral intermuscular septum?

Answer 2

Radial nerve

Question 3

Origin of Coracobrachialis Muscle

Answer 3

Coracoid process of scapula

Question 4

Insertion of Coracobrachialis Muscle

Answer 4

Middle of medial aspect of humerus

Question 5

Nerve Supply of Coracobrachialis Muscle

Answer 5

Musculocutaneous nerve

Question 6

Action of Coracobrachialis Muscle

Answer 6

• flexion of shoulder joint

- adduction of the arm

Question 7

Origin of Biceps Brachii Muscle

Answer 7

Short head: coracoid process

Long head: supraglenoid tubercle of the scapula

Question 8

Insertion of Biceps Brachii Muscle

Answer 8

Posterior part of the radial tuberosity

Bicipital aponeurosis into the deep fascia of the cubital fossa

Question 9

Relation of Biceps brachii to shoulder

Answer 9

Intracapsular, extrasynovial

Question 10

Nerve supply of Biceps brachii

Answer 10

Musculocutaneous nerve

Question 11

Actions of Biceps brachii

Answer 11

Flexor of the elbow
Supinator of flexed arm
Long head: stabilises shoulder joint

Question 12

Origin of Brachialis

Answer 12

Lower half of the front of the shaft of the humerus and the front of the two intermuscular septa

Question 13

Insertion of Brachialis

Answer 13

Cornoid process of ulna and ulnar tuberosity

Question 14

Nerve supply of the Brachialis

Answer 14

Musculocutaneous 
Radial nerve (for the lateral part)

Question 15

Action of Brachialis

Answer 15

Main flexor of the elbow joint

Question 16

Origin of Musculocutaneous nerve

Answer 16

Branching from the lateral cord of the Brachial plexus

Question 17

Termination of Musculocutaneous nerve

Answer 17

By continuing as the lateral cutaneous nerve of the forearm

Question 18

Course of Musculocutaneous nerve

Answer 18

Descends lateral to the 3rd part of the axillary artery between it and the coracobrachialis muscle. It pierces the Coracobrachialis

Question 19

Branches of Musculocutaneous nerve

Answer 19

• 2 heads of biceps brachii
• Coracobrachialis
• greater part of brachialis

Question 20

Origin of Brachial Artery

Answer 20

Lower border of teres major as a continuation of the axillary artery

Question 21

Termination of Brachial Artery

Answer 21

Ends opposite the neck of the radius

Divides into radial and ulnar terminal arteries

Question 22

The brachial artery is laterally related to

Answer 22

The median nerve

Question 23

The brachial artery is medially related to

Answer 23

The basilic vein

Question 24

Branches of the brachial artery

Answer 24

• profunda brachii artery
• muscular branches
• nutrient artery to the humerus
• superior ulnar collateral artery
• inferior ulnar collateral artery
• radial and ulnar terminal branches

Question 25

Contents of Posterior Compartment of the Arm

Answer 25

- triceps muscle - radial nerve - profunda brachii vessels - superior ulnar collateral vessels - posterior branch of inferior ulnar collateral

Question 26

Origin of Triceps Muscle

Answer 26

- long head: infraglenoid tubercle - lateral head: back of the humerus above the spiral groove - medial head: back of the humerus below the spiral groove

Question 27

Insertion of Triceps

Answer 27

Olecranon process of ulna

Question 28

Nerve Supply of Triceps

Answer 28

Radial Nerve

Question 29

Actions of Triceps

Answer 29

- main extensor of the arm - long head shares in stability of shoulder - long head helps in adduction

Question 30

Median Nerve Origin

Answer 30

Medial root: C8, T1 Lateral root: C5 C6 C7 Unison if two roots

Question 31

Course of the Median Nerve

Answer 31

- lateral to 3rd part of axillary artery and upper half of brachial artery - crosses in front of the brachial artery at the middle of the arm - descends medial to the artery down to the cubital fossa - enters the forearm by passing between 2 heads of pronator teres

Question 32

Branches of the median nerve in arm

Answer 32

None

Question 33

Origin of the Ulnar Nerve

Answer 33

C7, C8, T1 | Branch if medial cord of brachial plexus

Question 34

Course of the Ulnar Nerve

Answer 34

- descends close to the medial side of the 3rd part of axillary artery and upper half of brachial artery - at the mid-humeral shaft, it pierces the medial intermuscular septum to reach the posterior compartment - descends down to the back of the medial epicondyle - enters the forearm by passing between the two heads of flexor carpi ulnaris muscle

Question 35

Branches of Ulnar Nerve in arm

Answer 35

None

Question 36

Origin of Radial Nerve

Answer 36

Posterior Cord of Brachial Plexus

Question 37

Course of Radial Nerve

Answer 37

- descends posterior to the 3rd part of the axillary artery and brachial artery - in the spiral groove, it lies in the middle of the medial and lateral heads of the triceps - pierces the lateral intermuscular septum to reach the front of the arm - descends between brachialis and brachioradialis

Question 38

Branches of the Radial Nerve in the Axilla

Answer 38

- muscular branches to long and medial heads of triceps | - posterior cutaneous nerve of the arm

Question 39

Branches of the Radial Nerve in the Arm (Spiral Groove)

Answer 39

- muscular branches to the lateral and medial heads of triceps - muscular branch to the anconeus muscle - lower lateral cutaneous nerve of the arm - posterior cutaneous nerve of the forearm

Question 40

Branches of the Radial Nerve in the groove between brachialis and brachioradialis

Answer 40

- muscular branch to brachialis - muscular branch to brachoradialis - muscular branch to extensor carpi radialis longus

Question 41

Medial Boundary of Cubital fossa

Answer 41

Pronator Teres

Question 42

Lateral Boundary of Cubital Fossa

Answer 42

Brachioradialis

Question 43

Base of Cubital Fossa

Answer 43

Imaginary line connecting the two humeral epicondyles

Question 44

Apex of Cubital fossa

Answer 44

Point of overlap of brachioradialis over pronator teres

Question 45

Roof of cubital fossa

Answer 45

- skin - superficial fascia - deep fascia - bicipital aponeurosis

Question 46

Floor of Cubital fossa

Answer 46

``` Brachialis muscle (medially) Supinator muscle( laterally) ```

Question 47

Contents of Cubital Fossa (from lateral to medial)

Answer 47

- biceps tendons - brachial artery - median nerve