O-I-A-N Posterior Forearm Muscles

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PT605 Anatomy, Oregon Tech

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47 Terms

1
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<p>Origin of Brachioradialis</p>

Origin of Brachioradialis

Proximal 2/3 of the lateral supracondylar ridge, lateral intermuscular septum.

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<p>Insertion of Brachioradialis</p>

Insertion of Brachioradialis

Radial styloid process.

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<p>Actions of Brachioradialis</p>

Actions of Brachioradialis

Elbow flexion, forearm pronation, forearm supination.

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<p>Nerve Supply of Brachioradialis</p>

Nerve Supply of Brachioradialis

Radial nerve C5, C6.

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<p>Origin of Extensor Carpi Radialis Longus</p>

Origin of Extensor Carpi Radialis Longus

Distal 1/3 of the lateral supracondylar ridge, lateral intermuscular septum.

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<p>Insertion of Extensor Carpi Radialis Longus</p>

Insertion of Extensor Carpi Radialis Longus

Base of MC #2.

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<p>Actions of Extensor Carpi Radialis Longus</p>

Actions of Extensor Carpi Radialis Longus

Elbow flexion, wrist extension, wrist RD.

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<p>Nerve Supply of Extensor Carpi Radialis Longus</p>

Nerve Supply of Extensor Carpi Radialis Longus

Radial nerve C6, C7.

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<p>Origin <span>of Extensor Carpi Radialis Brevis</span></p>

Origin of Extensor Carpi Radialis Brevis

Lateral epicondyle via the CET.

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<p>Insertion of Extensor Carpi Radialis Brevis</p>

Insertion of Extensor Carpi Radialis Brevis

Base of MC #3.

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<p>Actions of Extensor Carpi Radialis Brevis</p>

Actions of Extensor Carpi Radialis Brevis

Wrist extension, wrist RD.

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<p>Nerve Supply of Extensor Carpi Radialis Brevis</p>

Nerve Supply of Extensor Carpi Radialis Brevis

Deep Radial nerve C6, C7.

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<p>Origin of Extensor Digitorum</p>

Origin of Extensor Digitorum

Lateral epicondyle via the CET.

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<p>Insertion of Extensor Digitorum</p>

Insertion of Extensor Digitorum

Base of the middle and distal phalanges 2-5 via DDE.

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<p>Actions of Extensor Digitorum</p>

Actions of Extensor Digitorum

Wrist extension, finger extension 2-5 of MCP, PIP, DIP joints.

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<p>Nerve Supply of Extensor Digitorum</p>

Nerve Supply of Extensor Digitorum

Radial nerve (PIN) C7, C8.

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<p>Origin of Extensor Digiti Minimi</p>

Origin of Extensor Digiti Minimi

Lateral epicondyle via the CET.

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<p>Insertion of Extensor Digiti Minimi</p>

Insertion of Extensor Digiti Minimi

Base of distal phalanx #5 via DDE, runs on ulnar side of ED.

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<p>Actions of Extensor Digiti Minimi</p>

Actions of Extensor Digiti Minimi

Wrist extension, wrist UD, little finger extension at MCP, PIP, DIP joints.

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<p>Nerve Supply of Extensor Digiti Minimi</p>

Nerve Supply of Extensor Digiti Minimi

Radial nerve (PIN) C7, C8.

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<p>Dorsal Digital Expansion</p>

Dorsal Digital Expansion

Allows MCP flexion while maintaining PIP and DIP extension.

<p>Allows MCP flexion while maintaining PIP and DIP extension.</p>
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<p>Origin of Extensor Carpi Ulnaris</p>

Origin of Extensor Carpi Ulnaris

Humeral head: Lateral epicondyle via the CET.

Ulnar head: Posterior border of ulna.

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<p>Insertion of Extensor Carpi Ulnaris</p>

Insertion of Extensor Carpi Ulnaris

Base of MC #5.

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<p>Actions of Extensor Carpi Ulnaris</p>

Actions of Extensor Carpi Ulnaris

Wrist extension, wrist UD.

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<p>Nerve Supply of Extensor Carpi Ulnaris</p>

Nerve Supply of Extensor Carpi Ulnaris

Radial nerve (PIN) C7, C8.

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<p>Origin of Supinator</p>

Origin of Supinator

Humeral head: Lateral epicondyle via CET.

Ulnar head: Supinator fossa.

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<p>Insertion of Supinator</p>

Insertion of Supinator

Proximal 1/3 posterior surface of the radius.

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<p>Actions of Supinator</p>

Actions of Supinator

Forearm supination.

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<p>Nerve Supply of Supinator</p>

Nerve Supply of Supinator

Deep Radial nerve C5, C6.

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<p>Origin of Abductor Pollicis Longus</p>

Origin of Abductor Pollicis Longus

Middle 1/3 posterior surface of the radius and ulna, interosseous membrane.

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<p>Insertion of Abductor Pollicis Longus</p>

Insertion of Abductor Pollicis Longus

Radial side of the base of MC #1.

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<p>Actions of Abductor Pollicis Longus</p>

Actions of Abductor Pollicis Longus

Wrist RD, thumb abduction at CMC joint.

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<p>Nerve Supply of Abductor Pollicis Longus</p>

Nerve Supply of Abductor Pollicis Longus

Radial nerve (PIN) C7, C8.

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<p>Origin of Extensor Pollicis Brevis</p>

Origin of Extensor Pollicis Brevis

Middle 1/3 posterior surface of radius just distal to APL, interosseous membrane.

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<p>Insertion of Extensor Pollicis Brevis</p>

Insertion of Extensor Pollicis Brevis

Base of proximal phalanx #1.

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<p>Actions of Extensor Pollicis Brevis</p>

Actions of Extensor Pollicis Brevis

Wrist RD, thumb extension at the CMC and MCP joints.

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<p>Nerve Supply of Extensor Pollicis Brevis</p>

Nerve Supply of Extensor Pollicis Brevis

Radial nerve (PIN) C7, C8.

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<p>Origin of Extensor Pollicis Longus</p>

Origin of Extensor Pollicis Longus

Middle 1/3 posterior surface of the ulna just distal to APL, interosseous membrane.

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<p>Insertion of Extensor Pollicis Longus</p>

Insertion of Extensor Pollicis Longus

Base of distal phalanx #1, EPL tendon travels around ulnar side of “Lister’s tubercle” like a pulley.

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<p>Actions of Extensor Pollicis Longus</p>

Actions of Extensor Pollicis Longus

Wrist extension, thumb extension at the CMC, MCP, IP joints.

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<p>Nerve Supply of Extensor Pollicis Longus</p>

Nerve Supply of Extensor Pollicis Longus

Radial nerve (PIN) C7, C8.

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<p>Origin of Extensor Indicis</p>

Origin of Extensor Indicis

Distal 1/3 posterior surface of the ulna, interosseous membrane.

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<p>Insertion of Extensor Indicis</p>

Insertion of Extensor Indicis

Base of distal phalanx #2 via the DDE, runs on ulnar side of ED.

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<p>Actions of Extensor Indicis</p>

Actions of Extensor Indicis

Wrist extension, index finger extension at the MCP, PIP, DIP joints.

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<p>Nerve Supply of Extensor Indicis</p>

Nerve Supply of Extensor Indicis

Radial nerve (PIN) C7, C8.

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<p>Deep Posterior Forearm Muscles</p>

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)

<p>Supinator*, Abductor Pollicis Longus (APL), Extensor Pollicis Brevis (EPB), Extensor Pollicis Longus (EPL), Extensor Indicis (EI).</p><p>On Cross Section: Abductor Pollicis Longus (APL), Extensor Pollicis Brevis (EPB), Extensor Pollicis Longus (EPL)</p>
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<p>Anatomical Snuff Box</p>

Anatomical Snuff Box

  1. EPL,

  2. EPB,

  3. APL.

<ol><li><p>EPL, </p></li><li><p>EPB, </p></li><li><p>APL.</p></li></ol>