Muscles Week 11

Question 1

What is the origin of the Pronator Quadratus?

Answer 1

anterior distal (¼) of ulna

Question 2

What is the insertion of the Pronator Quadratus?

Answer 2

anterior distal (¼) of radius

Question 3

What is the action of the Pronator Quadratus?

Answer 3

pronation of forearm

Question 4

What is the innervation of the Pronator Quadratus?

Answer 4

median nerve

Question 5

What is the origin of the Brachioradialis?

Answer 5

Lateral supracondylar ridge of humerus

Question 6

What is the insertion of the Brachioradialis?

Answer 6

Styloid process of radius

Question 7

What is the action of the Brachioradialis?

Answer 7

Flexion of elbow

Question 8

What is the innervation of the Brachioradialis?

Answer 8

Radial nerve

Question 9

What is the origin of the Extensor Carpi Radialis Longus?

Answer 9

Distal 1/3 of lateral supracondylar ridge

Question 10

What is the insertion point of the Extensor Carpi Radialis Longus?

Answer 10

Base of 2nd metacarpal

Question 11

What are the actions of the Extensor Carpi Radialis Longus?

Answer 11

Extension of wrist, radial flexion (abduction) of wrist, weak flexion/supination of elbow

Question 12

What is the innervation of the Extensor Carpi Radialis Longus?

Answer 12

Radial nerve

Question 13

What is the origin of the Extensor Carpi Radialis Brevis?

Answer 13

Lateral epicondyle (common extensor tendon)

Question 14

What is the insertion point of the Extensor Carpi Radialis Brevis?

Answer 14

Base of 3rd metacarpal (dorsal side)

Question 15

What are the actions of the Extensor Carpi Radialis Brevis?

Answer 15

Extension of wrist and radial flexion (abduction) of wrist

It crosses the elbow, resulting in weak flexion of the elbow joint.

Question 16

What is the innervation of the Extensor Carpi Radialis Brevis?

Answer 16

Radial nerve

Question 17

What is the origin of the Extensor Digitorum?

Answer 17

Lateral epicondyle of humerus (via common extensor tendon)

Question 18

What is the insertion of the Extensor Digitorum?

Answer 18

Phalanges 2-5 (mid and distal)

Question 19

What is the action of the Extensor Digitorum?

Answer 19

Extension of fingers 2-5 (MCP, PIP, DIP) and extension of wrist

It crosses the elbow joint, so it has a weak effect on elbow extension.

Question 20

What is the innervation of the Extensor Digitorum?

Answer 20

Radial nerve

Question 21

What is the origin of the Extensor Digiti Minimi?

Answer 21

Lateral epicondyle of humerus (common extensor tendon)

Question 22

Where does the Extensor Digiti Minimi insert?

Answer 22

Middle and distal phalanges of 5th digit (extensor expansion)

Question 23

What is the action of the Extensor Digiti Minimi?

Answer 23

Extension of little finger (5th digit)

Also contributes to extension of wrist and weak extension of elbow.

Question 24

What is the innervation of the Extensor Digiti Minimi?

Answer 24

Radial nerve

Question 25

What is the origin of the Anconeus?

Answer 25

Lateral epicondyle of humerus

Question 26

What is the insertion of the Anconeus?

Answer 26

Olecranon process and proximal ¼ of posterior ulna

Question 27

What is the action of the Anconeus?

Answer 27

Extension of elbow

Question 28

What is the innervation of the Anconeus?

Answer 28

Radial nerve

Question 29

What is the origin of the Extensor Carpi Ulnaris?

Answer 29

Humeral head: lateral epicondyle (common extensor tendon); Ulnar head: posterior shaft of ulna

Question 30

Where does the Extensor Carpi Ulnaris insert?

Answer 30

Base of 5th metacarpal (dorsal side)

Question 31

What actions does the Extensor Carpi Ulnaris perform?

Answer 31

Ulnar flexion (adduction of wrist); Extension of wrist; Weak elbow extension

Question 32

What is the innervation of the Extensor Carpi Ulnaris?

Answer 32

Radial nerve