Anatomy of the arm - El Adl

Question 1

At the end of the humerus, we have the lateral and medial ————- , medially we have the————, and laterally we have the————– .

Answer 1

1-epicondyle
2-trochlea
3-capitulum

Question 2

From the posterior aspect of the humerus we have the ?

Answer 2

olecranon fossa for the olecranon process of the ulnar.

Question 3

Just behind the medial epicondyle we have the ?

Answer 3

ulnar nerve . (due to that if you tap on that area you will feel numbness in your fingers)

Question 4

We have three fossae :
2 Anteriorly-
1 Posteriorly -

Answer 4

-Coronoid fossa and radial fossa

-Olecranon fossa

Question 5

Trochlea articulate with?

Answer 5

the trochlear fossa of the ulna.

Question 6

Lateral to the trochlea we have the

Answer 6

capitulum, which in turn articulate with the head of the radius.

Question 7

The upper arm is divided by attachment of

Answer 7

medial and lateral intermuscular septa and the humerus into anterior and posterior compartment.

Question 8

The anterior compartment contains the

Answer 8

flexors group which will flex the elbow and shoulder joint

Question 9

the posterior compartment will contain the

Answer 9

extensors.

Question 10

Lateral intermuscular septum: connects the

Answer 10

deep fascia with the lateral border of the humerus.

Question 11

Medial intermuscular septum: connects the

Answer 11

deep fascia with the medial border of the humerus.

Question 12

The posterior compartment contains one muscle with heads which is the

Answer 12

triceps

Question 13

the anterior contains 3 muscles which are :

Answer 13

BBC - biceps , brachialis , coracobrachialis.

Question 14

biceps ,origin , long head :

Answer 14

Supraglenoid tubercle of the scapula

Question 15

ORIGIN:
2. Short head:

Answer 15

Tip of the coracoid process in common with the coracobrachialis

Question 16

INSERTION of biceps

Answer 16

-posterior rough part of the radial tuberosity
- bicipital aponeurosis

Question 17

NERVE SUPPLY:of biceps:-

Answer 17

Musculocutaneous nerve.

Question 18

ACTION of biceps

Answer 18

Both heads Supination of the flexed forearm.
Flexion of the elbow joint. (The short head is a weak flexor of the shoulder joint.
The long head: prevents the upward dislocation of the shoulder joint)

Question 19

origin of : CORACOBRACHIALIS

Answer 19

Tip of the coracoid process, in common with the short head of the biceps

Question 20

insertion of coracobrachialis

Answer 20

Middle of medial border of the humerus

Question 21

nerve supply of coracobrachialis

Answer 21

Musculocutaneous nerve

Question 22

action of coracobrachialis

Answer 22

Flexion and adduction of the arm

Question 23

Origin of brachialis

Answer 23

-Lower ½ of the front of the humerus.
-Lateral & medial intermuscular septa

Question 24

INSERTION of brachialis

Answer 24

Ulnar tuberosity

Question 25

NERVE SUPPLY of brachialis

Answer 25

-Musculocutaneous nerve.
-Radial nerve supplies a small lateral part.

Question 26

ACTION of brachialis

Answer 26

Flexion of the elbow

Question 27

TRICEPS (long head) origin :

Answer 27

Infraglenoid tubercle of the scapula

Question 28

Triceps (Lateral head) origin :

Answer 28

Upper ½ of the posterior surface of the shaft of the humerus above the spiral groove of the scapula.

Question 29

Triceps (Medial head) origin :

Answer 29

-Posterior surface of the lower ½ of the shaft of the humerus below the spiral groove.
-Back of lateral & medial intermuscular septa.

Question 30

insertion of triceps

Answer 30

olecranon process of the ulna

Question 31

nerve supply of triceps

Answer 31

Each head receives a separate branch from the radial nerve

Question 32

Action of Triceps

Answer 32

Powerful extensor of the elbow joint.
Its main function is to keep the elbow extended when one is pushing an object