Muscles Week 11 Flashcards
What is the origin of the Pronator Quadratus?
anterior distal (¼) of ulna
What is the insertion of the Pronator Quadratus?
anterior distal (¼) of radius
What is the action of the Pronator Quadratus?
pronation of forearm
What is the innervation of the Pronator Quadratus?
median nerve
What is the origin of the Brachioradialis?
Lateral supracondylar ridge of humerus
What is the insertion of the Brachioradialis?
Styloid process of radius
What is the action of the Brachioradialis?
Flexion of elbow
What is the innervation of the Brachioradialis?
Radial nerve
What is the origin of the Extensor Carpi Radialis Longus?
Distal 1/3 of lateral supracondylar ridge
What is the insertion point of the Extensor Carpi Radialis Longus?
Base of 2nd metacarpal
What are the actions of the Extensor Carpi Radialis Longus?
Extension of wrist, radial flexion (abduction) of wrist, weak flexion/supination of elbow
What is the innervation of the Extensor Carpi Radialis Longus?
Radial nerve
What is the origin of the Extensor Carpi Radialis Brevis?
Lateral epicondyle (common extensor tendon)
What is the insertion point of the Extensor Carpi Radialis Brevis?
Base of 3rd metacarpal (dorsal side)
What are the actions of the Extensor Carpi Radialis Brevis?
Extension of wrist and radial flexion (abduction) of wrist
It crosses the elbow, resulting in weak flexion of the elbow joint.
What is the innervation of the Extensor Carpi Radialis Brevis?
Radial nerve
What is the origin of the Extensor Digitorum?
Lateral epicondyle of humerus (via common extensor tendon)
What is the insertion of the Extensor Digitorum?
Phalanges 2-5 (mid and distal)
What is the action of the Extensor Digitorum?
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.
What is the innervation of the Extensor Digitorum?
Radial nerve
What is the origin of the Extensor Digiti Minimi?
Lateral epicondyle of humerus (common extensor tendon)
Where does the Extensor Digiti Minimi insert?
Middle and distal phalanges of 5th digit (extensor expansion)
What is the action of the Extensor Digiti Minimi?
Extension of little finger (5th digit)
Also contributes to extension of wrist and weak extension of elbow.
What is the innervation of the Extensor Digiti Minimi?
Radial nerve
What is the origin of the Anconeus?
Lateral epicondyle of humerus
What is the insertion of the Anconeus?
Olecranon process and proximal ¼ of posterior ulna
What is the action of the Anconeus?
Extension of elbow
What is the innervation of the Anconeus?
Radial nerve
What is the origin of the Extensor Carpi Ulnaris?
Humeral head: lateral epicondyle (common extensor tendon); Ulnar head: posterior shaft of ulna
Where does the Extensor Carpi Ulnaris insert?
Base of 5th metacarpal (dorsal side)
What actions does the Extensor Carpi Ulnaris perform?
Ulnar flexion (adduction of wrist); Extension of wrist; Weak elbow extension
What is the innervation of the Extensor Carpi Ulnaris?
Radial nerve
