Arm And Cubital Fossa

Question 1

Arm Joints

Answer 1

Proximal: Glenohumeral Joint
Distal: Humeroulnar and Humeroradial

Proximal Radio-Ulnar

Question 2

Which bones make up the Glenohumeral joint?

Answer 2

Scapula + Humerus

Question 3

Elbow joints responsible for flexión and extension

Answer 3

Humeroulnar + Humeroradial

Question 4

Elbow joint responsible for supination and pronation

Answer 4

Proximal radio-ulnar joint

Question 5

Attachment and components of Glenohumeral joint

Answer 5

Attaches from supraglenoid tubercle to lesser tubercle of the humerus.

Has an superior, middle and inferior thickening

Question 6

Attachment and components of transverse humeral ligament

Answer 6

Spans the greater and lesser tubercle of the humerus.

Holds the long head of the bicep tendon.

Question 7

What are the components of the ulnar collateral ligament and where does it attach?

Answer 7

Attaches from medial epicondyle of the humerus to coronoid process and olecranon of ulna.

Has an anterior, posterior and oblique band.

Question 8

What are the components of the radial collateral ligament and where does it attach?

Answer 8

Attaches from lateral epicondyle of humerus to radial notch and angular ligament.

Weaker than ulnar collateral ligament but provides posterolateral stability.

Question 9

What are the components of the angular ligament and where does it attach?

Answer 9

It surrounds the radial head and radial notch of the ulna.

Keeps the radial head in the radial notch; allows pronation and supination.

Question 10

In what two compartments is the arm divided?

Answer 10

It is divided into anterior (flexor) and posterior (extensor) by the intermuscular septum

Question 11

What nerve and blood vessel supplies the posterior compartment of the arm?

Answer 11

Radial nerve + profunda brachii artery

Question 12

Supplies blood and innervation to flexor compartment of the arm

Answer 12

Brachial artery and musculocuteaneous nerve

Question 13

Muscles of of anterior compartment of the arm

Answer 13

Biceps brachii
Brachialis
Coracobrachialis

Question 14

Muscles of of extensor compartment of the arm

Answer 14

Triceps brachii

Anconeus

Question 15

Origin of biceps brachii

Answer 15

Short head: apex of coracoid process of scapula

Long head: supraglenoid tubercle of the scapula

Question 16

Insertion of biceps brachii

Answer 16

Radial tuberosity

Question 17

Attachments of Brachialis

Answer 17

Proximal: middle anterior surface of humerus
Distal: coronoid process and tuberosity of ulna

Question 18

Attachments of Coracobrachialis

Answer 18

Proximal: tip of the coracoid process of the scapula
Distal: middle medial surface of humerus

Question 19

Biceps brachii function

Answer 19

Flexes forearm at elbow; flexes supinated forearm

Question 20

Brachioradialis main action

Answer 20

Flexes forearm at elbow in any position

Question 21

Coracobrachialis function

Answer 21

Helps flex and abduct arm at shoulder

Question 22

Proximal attachment of triceps brachii

Answer 22

Long head: infraglenoid tubercle of scapula

Medial and lateral heads: posterior surface of humerus

Question 23

Distal attachment of triceps brachii

Answer 23

Posterior surface of olecranon of ulna

Question 24

Main actions of triceps brachii

Answer 24

Main extensor of the the elbow; steadies the head of abducted humerus

Question 25

Main actions of anconeus

Answer 25

Assists triceps in extension; abducts ulna during pronation

Question 26

Aconeus attachments

Answer 26

Proximal: lateral epicondyle of humerus Distal: lateral surface of olecranon and superior part of posterior surface of ulna

Question 27

Two articular parts of the condyle

Answer 27

1. Capitulum: articulates with radius | 2. Throchlea: articulates with ulna

Question 28

Brachial artery (4 characteristics)

Answer 28

Continuation of axillary artery Divides into radial and ulnar arteries In proximal arm: lies on medial side In distal arm: lies on lateral side

Question 29

Median nerve (3 characteristics)

Answer 29

Passes down medial side of the arm Proximal region: lateral to brachial artery Distal region: medial to brachial artery

Question 30

Ulnar nerve (trajectory)

Answer 30

Enters arm with median nerve and axillary artery, passing medial to the artery. Passes posterior to medial epicondyle of humerus and then to anterior compartment of the forearm.

Question 31

What is the cubital fossa?

Answer 31

Triangular depression between brachioradialis and pronator teres.