1 Structure IDs- Forearm (Muscles/Ligaments)

Question 1

Ulnar collateral ligament

Answer 1

Function: resists excessive cubital valgus

Attachments: from medial epicondyle to medial margin of coronoid process and olecranon process

Question 2

Radial collateral ligament

Answer 2

Function: resists excessive cubital varus

Attachments: from lateral epicondyle to anular ligament

Question 3

Anular ligament

Answer 3

Function: stabilizes proximal radioulnar joint

Attachments: from anterior margin of the radial notch to posterior margin or radial notch surrounding head of radius

Question 4

Interosseous membrane

Answer 4

Attachments: from interosseous border of radius to interosseus border of ulna

Question 5

Transverse carpal ligament

Answer 5

Function: prevent s bowstringing of the tendons of the flexor pollicis longus, flexor digitorum superficialis and flexor digitorum profundus

Attachments: from the pisiform and hook of hamate to scaphoid and trapezium

Question 6

Collateral ligaments of metacarpophalangeal joints

Answer 6

Function: stabilizes metacarpophalangeal joints

Attachments: from the head of metacarpals to base of adjacent proximal phalanx

Question 7

Abductor pollicis longus (C6-8)

Answer 7

Attachments: from proximal posterior radius, ulna and interosseous membrane to the base of the 1st metacarpal and trapezium

Actions: abducts and extends thumb at carpometacarpal joint and abducts hand and wrist (radial deviation)

Innervation: radial nerve

Question 8

Brachioradialis (C5-6)

Answer 8

Attachments: from the lateral supracondylar ridge of the humerus to the distal radius lateral to the styloid process

Actions: flexes the elbow

Innervation: radial nerve

Question 9

Extensor carpi radialis brevis (C6-8)

Answer 9

Attachments: from the lateral epicondyle of the humerus (common extensor origin) to the base pf the 3rd metacarpal

Actions: extends and abducts hand at wrist (radial deviation)

Innervation: radial nerve

Question 10

Extensor carpi radialis longus (C6-8)

Answer 10

Attachments: from the lateral supracondylar ridge of the humerus to the base of the 2nd metacarpal

Actions: extends and abducts hand at wrist (radial deviation) and assists in flexion of the elbow

Innervation: radial nerve

Question 11

Extensor carpi ulnaris (C6-8)

Answer 11

Attachments: from the lateral epicondyle of the humerus (common extensor origin) to the base of the 5th metacarpal

Actions: extends and adducts hand at wrist (ulnar deviation)

Innervation: radial nerve

Question 12

Extensor digitorum (C6-8)

Answer 12

Attachments: from the lateral epicondyle of the humerus (common extensor origin) to the extensor expansions of digits 2-5

Actions: extends phalanges (primarily at the metacarpophalangeal, secondarily at interpharangeal) and hand at wrist

Innervation: radial nerve

Question 13

Extensor digiti minimi (C7-8)

Answer 13

Attachments: from the lateral epicondyle of the humerus (common extensor origin) to the digital expansion of the 5th digit

Actions: extends 5th digit (metacarpophalangeal and interphalangeal)

Innervation: radial nerve

Question 14

Extensor indicis (C7-8)

Answer 14

Attachments: from the posterior surface of the ulna and interosseous membrane to the digital expansion of the 2nd digit

Actions: extends 2nd digit (metacarpophalangeal and interphalangeal)

Innervation: radial nerve

Question 15

Extensor pollicis brevis (C6-8)

Answer 15

Attachments: from the posterior radial surface and interosseous membrane to the base of the 1st proximal phalanx

Actions: extends thumb (metacarpophalangeal) and extends and abducts CMC joint

Innervation: radial nerve

Question 16

Extensor pollicis longus (C6-8)

Answer 16

Attachments: from the middle 1/3rdof the posterior surface of the ulna and interosseous membrane to the bsae of the 1st distal phalanx

Actions: extends thumb (CMC and metacarpophalangeal and interphalangeal)

Innervation: radial nerve

Question 17

Flexor carpi radialis (C6-8)

Answer 17

Attachments: from the medial epicondyle (common flexor origin) to the palmar aspect of the base of the 2nd metacarpal

Actions: flexes and abducts hand at wrist (radial deviation) and may assist in pronation of forearm and flexion of the elbow

Innervation: median nerve

Question 18

Flexor carpi ulnaris (C7-T1)

Answer 18

Attachments: from the medial epicondyle (common flexor origin) of the humerus and proximal ulnar shaft to the pisiform

Actions: flexes and adducts hand at wrist (ulnar deviation) and assists in flexion of the elbow

Innervation: ulnar nerve

Question 19

Flexor digitorum profundus (C7-T1)

Answer 19

Attachments: from the anterior proximal 2/3rds of the ulna and interosseous membrane to the base of the distal phalanges of digits 2-5

Actions: flexion of digits 2-5 (metacarpophalangeal and distal interphalangeal and proximal interphalangeal) flexion of hand at wrist

Innervation: median (anterior interosseous nerve, 2nd and 3rd digits) and ulnar (4th and 5th digits) nerves

Question 20

Flexor digitorum superficialis (C7-T1)

Answer 20

Attachments: from the medial epicondyle (common flexor digitorum) of the humerus to the sides of the middle phalanges of digits 2-5

Actions: flexion of digits (metacarpophalangeal and proximal interphalangeal) and hand at wrist

Innervation: median nerve

Question 21

Flexor pollicis longus (C7-T1)

Answer 21

Attachments: from the anterior surface of the radius and interosseous membrane to the base of the distal phalanx of the thumb

Actions: flexes thumb (metacarpophalangeal and interphalangeal)

Innervation: median nerve (anterior interosseous nerve)

Question 22

Palmaris longus (C7-8)

Answer 22

Attachments: from the medial epicondyle of the humerus (common flexor origin) to the palmar aponeurosis

Actions: flexes hand at wrist and tenses palmar fascia

Innervation: median nerve

Question 23

Pronator quadratus (C8-T1)

Answer 23

Attachments: from the anterior surface of the distal ulna to the anterior surface of the distal radius

Action: pronates the forearm

Innervation: meadian nerve (anterior interosseous membrane)

Question 24

Pronator teres (C6-7)

Answer 24

Attachments: from the medial epicondyle and ulnar coronoid process to lateral aspect of the radius

Actions: pronates and flexes forearm

Innervation: median nerve

Question 25

Supinator (C5-6)

Answer 25

Attachments: from the lateral epicondyle of the humerus, radial collateral ligament and supinator crest of the ulna to the lateral surface of the proximal radius

Actions: supinates forearm

Innervation: radial nerve