M. Upper Limb

Question 1

What is the upper limb?

Answer 1

Located between the shoulder joint and elbow joint

Question 2

How many muscles does the upper arm contain?

Answer 2

4

Question 3

What are the 4 different upper limb muscles?

Answer 3

Biceps brachii, brachialis, coracobrachialis, triceps brachii

Question 4

Where are the 4 muscles located, anterior or posterior
compartment?

Answer 4

Biceps brachii, brachialis, and coracobrachialis (BBC) ANTERIOR

Triceps brachii POSTERIOR

Question 5

How are all of the 3 anterior muscle compartments innervated by?

Answer 5

Musculocutaneous nerve

Question 6

Which artery supplies the upper arm?

Answer 6

Brachial artery

Question 7

Is biceps brachii a two head muscle ?

Answer 7

Yes

Question 8

Where is the bicep brachii located anterior to?

Answer 8

Humerus (and no attachment to bone itself)

Question 9

What is the bicipital aponeurosis ?

Answer 9

A connective tissues sheet that the tendon of biceps brachii enters through the forearm

Question 10

What does the bicipital aponeurosis form?

Answer 10

Forms the roof of cubital fossa and blends w deep fascia of the anterior forearm

Question 11

What is the origin of biceps brachii ?

Answer 11

Long head originates from the supraglenoid tubercle of the scapula. Both heads insert distally into the radial tuberosity and the fascia of the forearm via bicipital aponeurosis

Question 12

What is the function of the biceps brachii ?

Answer 12

Supination of the forearm, flexes arm at elbow and shoulder

Question 13

What is the biceps brachii innervation?

Answer 13

Musculocutaneous nerve. The bicep tendon reflex test the spinal cord C6

Question 14

Where does the coracobrachilis lie in?

Answer 14

Deep and superior to biceps brachii

Question 15

Where does the coracobrachialis originate from?

Answer 15

Originated from the coracoid process of scapula. The muscle passes through the axilla and attaches to the medial side of the humeral shaft at the level of the deltoid tubercle

Question 16

What is the function of coracobrachialis?

Answer 16

Flexion of the arm at the shoulder and weak adduction

Question 17

What is the innervation of the coracobrachialis?

Answer 17

Musculocutaneous nerve

Question 18

Where does the brachialis lie in?

Answer 18

Lies deep and distally from the biceps brachii. It forms the floor of the cubital fossa

Question 19

Where does the brachialis originate from?

Answer 19

From the medial and lateral surface of the humeral shaft and inserts into the ulnar tuberosity , distal from the elbow joint.

Question 20

Where does the arterial supply to the triceps brachii?

Answer 20

Via profunda brachii artery

Question 21

How many heads does the triceps brachii have and what are they called?

Answer 21

3
Long head
Lateral head
Medial head

Question 22

Where does the triceps brachii originate from?
(3 heads)

Answer 22

Long head - originates from infraglenoid tubercle
Lateral head- originates from the humerus ,superior to radial groove
Medial head- originates from the humerus, inferior to radial groove
Distally, the heads are at a tendon and insert in the olecranon of the ulna

Question 23

What is the function of triceps brachii?

Answer 23

Extension of the arm at the elbow

Question 24

What is the innervation of the triceps brachii?

Answer 24

Radial nerve
Triceps tendon test C7
(In some people it innervates in the axillary nerve)