Brachium

Question 1

What nerve supplies forearm flexion in anterior arm?

Answer 1

Muculocutaneous nerve.

Question 2

What nerve does forearm extension on posterior arm?

Answer 2

Radial nerve.

Question 3

What 3 muscles are in anterior portion of arm?

Answer 3

Biceps brachii.
Coracobrachialis.
Brachialis.

Question 4

What muscle is on posterior side of arm?

Answer 4

Triceps brachii.

Question 5

Origin of long head of biceps brachii?

Answer 5

Supraglenoid tubercle of scapula.

Question 6

What is origin of short head of biceps brachii?

Answer 6

Coracoid process of scapula.

Question 7

What is insertion for both long and short head of biceps brachii?

Answer 7

Radial tuberosity.

Question 8

What innervates biceps brachii?

Answer 8

Musculocuteanous nerve.

Question 9

What are the actions of biceps brachii?

Answer 9

Supinates forearms.
Is simple forearm flexor when elbow is extended and forearm is supinated.
The long head is the stabilizer of glenohumeral joint.

Question 10

What is the origin and insertion of coracobrachialis?

Answer 10

Coracoid process of scapula.
Inserts on medial surface of middle humerus.

Question 11

What innervates coracobrachialis?

Answer 11

Musculocuteanous nerve.

Question 12

What does coracobrachialis do?

Answer 12

Flexes and abducts the humerus @ glenohumeral joint.

Question 13

Brachialis origin and insertion?

Answer 13

Origin: distal half of anterior humerus.
Insertion: ulnar tuberosity and anterior surface of coronoid process.

Question 14

What innervates Brachialis?

Answer 14

Musculocuteanous nerve.

Question 15

Action of Brachialis?

Answer 15

Flexes the forearm at the elbow in any position. Controlled relaxation during extension of forearm to gently place a glass upon the table.

Question 16

What are entrapment sites for Musculocuteanous nerve?

Answer 16

Coracobrachialis.
Space between biceps brachii and Brachialis.

Question 17

What are entrapment sites for lateral antebrachial cutaneous nerve?

Answer 17

Biceps brachii and Brachialis.

Question 18

Triceps brachii origins?

Answer 18

Lateral head: posterolateral surface of humerus and lateral inter muscular septum.
Long head: infraglenoid tubercle of scapula.
Medial head: posteromedial surface of humerus and medial inter muscular septum.

Question 19

Where does triceps brachii insert and what innervates it?

Answer 19

Inserts on olecranon process of ulna and innervated by radial nerve.

Question 20

Action of triceps brachii?

Answer 20

Extend forearm at elbow. Long head stabilizes the glenohumeral joint and extends the humerus at glenohumeral joint.

Question 21

What forms medial border of cubital fossa?

Answer 21

Pronator teres.

Question 22

What forms floor of cubital fossa?

Answer 22

Brachialis

Question 23

What forms roof of cubital fossa?

Answer 23

Bicipital aponeurosis.

Question 24

What forms lateral border of cubital fossa?

Answer 24

Brachioradialis.