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PT605 Anatomy, Oregon Tech
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Origin of Brachioradialis
Proximal 2/3 of the lateral supracondylar ridge, lateral intermuscular septum.
Insertion of Brachioradialis
Radial styloid process.
Actions of Brachioradialis
Elbow flexion, forearm pronation, forearm supination.
Nerve Supply of Brachioradialis
Radial nerve C5, C6.
Origin of Extensor Carpi Radialis Longus
Distal 1/3 of the lateral supracondylar ridge, lateral intermuscular septum.
Insertion of Extensor Carpi Radialis Longus
Base of MC #2.
Actions of Extensor Carpi Radialis Longus
Elbow flexion, wrist extension, wrist RD.
Nerve Supply of Extensor Carpi Radialis Longus
Radial nerve C6, C7.
Origin of Extensor Carpi Radialis Brevis
Lateral epicondyle via the CET.
Insertion of Extensor Carpi Radialis Brevis
Base of MC #3.
Actions of Extensor Carpi Radialis Brevis
Wrist extension, wrist RD.
Nerve Supply of Extensor Carpi Radialis Brevis
Deep Radial nerve C6, C7.
Origin of Extensor Digitorum
Lateral epicondyle via the CET.
Insertion of Extensor Digitorum
Base of the middle and distal phalanges 2-5 via DDE.
Actions of Extensor Digitorum
Wrist extension, finger extension 2-5 of MCP, PIP, DIP joints.
Nerve Supply of Extensor Digitorum
Radial nerve (PIN) C7, C8.
Origin of Extensor Digiti Minimi
Lateral epicondyle via the CET.
Insertion of Extensor Digiti Minimi
Base of distal phalanx #5 via DDE, runs on ulnar side of ED.
Actions of Extensor Digiti Minimi
Wrist extension, wrist UD, little finger extension at MCP, PIP, DIP joints.
Nerve Supply of Extensor Digiti Minimi
Radial nerve (PIN) C7, C8.
Dorsal Digital Expansion
Allows MCP flexion while maintaining PIP and DIP extension.
Origin of Extensor Carpi Ulnaris
Humeral head: Lateral epicondyle via the CET.
Ulnar head: Posterior border of ulna.
Insertion of Extensor Carpi Ulnaris
Base of MC #5.
Actions of Extensor Carpi Ulnaris
Wrist extension, wrist UD.
Nerve Supply of Extensor Carpi Ulnaris
Radial nerve (PIN) C7, C8.
Origin of Supinator
Humeral head: Lateral epicondyle via CET.
Ulnar head: Supinator fossa.
Insertion of Supinator
Proximal 1/3 posterior surface of the radius.
Actions of Supinator
Forearm supination.
Nerve Supply of Supinator
Deep Radial nerve C5, C6.
Origin of Abductor Pollicis Longus
Middle 1/3 posterior surface of the radius and ulna, interosseous membrane.
Insertion of Abductor Pollicis Longus
Radial side of the base of MC #1.
Actions of Abductor Pollicis Longus
Wrist RD, thumb abduction at CMC joint.
Nerve Supply of Abductor Pollicis Longus
Radial nerve (PIN) C7, C8.
Origin of Extensor Pollicis Brevis
Middle 1/3 posterior surface of radius just distal to APL, interosseous membrane.
Insertion of Extensor Pollicis Brevis
Base of proximal phalanx #1.
Actions of Extensor Pollicis Brevis
Wrist RD, thumb extension at the CMC and MCP joints.
Nerve Supply of Extensor Pollicis Brevis
Radial nerve (PIN) C7, C8.
Origin of Extensor Pollicis Longus
Middle 1/3 posterior surface of the ulna just distal to APL, interosseous membrane.
Insertion of Extensor Pollicis Longus
Base of distal phalanx #1, EPL tendon travels around ulnar side of “Lister’s tubercle” like a pulley.
Actions of Extensor Pollicis Longus
Wrist extension, thumb extension at the CMC, MCP, IP joints.
Nerve Supply of Extensor Pollicis Longus
Radial nerve (PIN) C7, C8.
Origin of Extensor Indicis
Distal 1/3 posterior surface of the ulna, interosseous membrane.
Insertion of Extensor Indicis
Base of distal phalanx #2 via the DDE, runs on ulnar side of ED.
Actions of Extensor Indicis
Wrist extension, index finger extension at the MCP, PIP, DIP joints.
Nerve Supply of Extensor Indicis
Radial nerve (PIN) C7, C8.
Deep Posterior Forearm Muscles
Supinator*, Abductor Pollicis Longus (APL), Extensor Pollicis Brevis (EPB), Extensor Pollicis Longus (EPL), Extensor Indicis (EI).
On Cross Section: Abductor Pollicis Longus (APL), Extensor Pollicis Brevis (EPB), Extensor Pollicis Longus (EPL)
Anatomical Snuff Box
EPL,
EPB,
APL.