Muscles of the Elbow

Question 1

Attachments of biceps brachii

Answer 1

O: short head – apex of coracoid process of scapula
Long head – supraglenoid tubercle of scapula and adjacent glenoid labrum

I: posterior part of radial tuberosity

Question 2

Nerve supply to biceps brachii

Answer 2

Musculocutaneous nerve – C5, C6

Question 3

Action of biceps brachii

Answer 3

Flexion and powerful supination (when elbow flexed) of the elbow

Shoulder stabilisation and flexion

Question 4

Function of biceps brachii

Answer 4

picking something up

Question 5

Attachments of triceps brachii

Answer 5

O: long head- infraglenoid tubercle of scapula and adjacent glenoid tubercle, lateral head – above and lateral to spiral groove on posterior surface of humerus

Medial head - posterior surface of the humerus, below and medial to spiral groove

I: posterior proximal surface of olecranon of ulna and deep fascia of forearm.

Question 6

Action of triceps brachii

Answer 6

extends elbow

long head adducts arm and extends from flexed position

Question 7

Nerve supply of triceps brachii

Answer 7

Radial Nerve - C6, 7 and 8

Question 8

function of triceps brachii

Answer 8

pushing up off chair

Question 9

Attachments of pronator teres

Answer 9

O: humeral head - medial supracondylar ridge and common flexor originulnar head - pronator ridge on ulna

I: middle lateral radius

Question 10

Nerve supply to pronator teres

Answer 10

median nerve - C6, C7

Question 11

action of pronator teres

Answer 11

pronates and weak flexion of elbow

Question 12

function of pronator teres

Answer 12

turning something over

Question 13

Attachment of brachioradialis

Answer 13

O: upper 2/3rd of front of lateral supracondylar ridge of humerus

I: lateral surface of radius above styloid process

Question 14

Nerve supply for brachioradialis

Answer 14

Radial nerve - C5, C6

Question 15

Action of brachioradialis

Answer 15

Flexion of elbow, particularly in midpronation/ supernation

Question 16

Function of brachioradialis

Answer 16

Picking something up

Question 17

Attachments of supinator

Answer 17

O: Inferior aspect of lateral epicondyle of humerus, radial collateral ligament, annular ligament, supinator crest and fossa of ulna

I: posteiror, lateral and anterior aspects of radius

Question 18

Nerve supply to supinator

Answer 18

Posterior interosseous nerve of radial nerve C5,C6

Question 19

Function of supinator

Answer 19

Picking something up and turning it over to look at it

Question 20

Action of supinator

Answer 20

supination