Forearm muscles

What nerve innervates the posterior forearm?

What nerve innervates the posterior forearm?

Radial Nerve

What muscle is A? (Origin, insertion, action, innervation)

Extensor carpi radialis longus

O: Lateral supracondylar ridge

Ins: Base of 2nd metacarpal

Act: Extension and assist in radial deviation at Radiocarpal joint

Inn: Radial Nerve

What muscle is B? (Origin, insertion, action, innervation)

Extensor carpi radialis brevis

O: Lateral epicondyle

Ins: Base of 3rd metacarpal

Act: Extension and assist in radial deviation at Radiocarpal joint

Inn: Radial Nerve

What is muscle C? (Origin, insertion, action, innervation)

Extensor Digitorum

O: Lateral epicondyle

Ins: extensor expansion

Act: Extension MCP, PIP, and DIP joint of 2-5 , Extension of radiocarpal joint

Inn: Radial Nerve

What is muscle D? (Origin, insertion, action, innervation)

Extensor carpi ulnaris

O: Lateral epicondyle and posterior ulna

Ins: Base of 5th metacarpal

Act:Extension and assist with ulnar deviation at Radiocarpal joint

Inn: Radial Nerve

What is muscle A ? (Origin, insertion, action, innervation)

Extensor digiti minimi

O: Lateral epicondyle

Ins: 5th phalanx extensor

Act:Extension 5th MCP and Extension of radiocarpal joint (weak)

Inn: Radial Nerve

What is muscle B?

extensor carpi ulnaris

What is muscle C?

extensor Carpi radialis longus

What is D?

extensor carpi radialis brevis

What is E?

Extensor digitorum

What is A? (Origin, insertion, action, innervation)

Supinator

O: Lateral epicondyle

Ins: Lateral surface of proximal 1/3 radius

Act: supination of forearm

Inn: Radial Nerve

what is B? (Origin, insertion, action, innervation)

abductor pollicis Longus

O: mid-ulna, radius, and interosseous membrane

Ins: base of 1st metacarpal

Act: Abduct thumb at CMC

Inn: Radial Nerve

What is C? (Origin, insertion, action, innervation)

Extensor pollicis Longus

O: Posterior mid-ulna and interosseous membrane

Ins: base of distal phalanx of thumb

Act: extends thumb at IP , MCP, and CMC

Inn: Radial Nerve

What is D?(Origin, insertion, action, innervation)

extensor indicis

O: Posterior ulna

Ins: distal phalanx via tendon of extensor digitorum

Act: extends index finger at DIp, Pip, MCP and extension of wrist

Inn: Radial Nerve

What is E?

Extensor Carpi radialis

What is F ? (Origin, insertion, action, innervation)

Extensor Pollicis brevis

O: Posterior distal radius and interosseous membrane

Ins: base of proximal phalanx of thumb

Act: extension thumb at MCP and CMC

Inn: Radial Nerve

What is the green line pointing to?

Flexor carpi ulnaris

Anatomical Snuff box ( boundaries and contents)

Lateral: extensor pollicis brevis and abductor pollicis longus

Medial: extensor pollicis longus

Floor: scaphoid

Contents: Radial Artery

What muscles make up the superficial compartment of Anterior forearm

Pronator teres, flexor carpi radialis, Palmaris longus, and Flexor carpi ulnaris.

What muscle is the yellow arrow pointing at ? (Origin, insertion, action, innervation)

Brachioradialis

O: Lateral supracondylar ridge

Ins: Lateral distal radial styloid

Act: Flexes elbow joint

Inn: Radial Nerve

what is muscle A?(Origin, insertion, action, innervation)

Pronator Teres

O: Medial Epicondyle of humerus

Ins: Mid-Lateral surface of radius

Act: Pronates forearm at superior radioulnar joint

Inn: Median Nerve

What are the boundaries and contents of the cubital Fossa?

Lateral: brachioradialis

Medial: Pronator teres

Superior: Line connecting medial and lateral epicondyle

Contents:

tendons: biceps

Artery: Brachial

Nerve: Median

What is muscle B?(Origin, insertion, action, innervation)

Flexor Carpi radialis

O: Medial Epicondyle

Ins: 2nd and 3rd metacarpals

Act: flexes and assist with radial deviation

Inn: Median Nerve

what is muscle C?(Origin, insertion, action, innervation)

Palmaris Longus

O: Medial Epicondyle

Ins: flexor retinculum and palmar aponerosis

Act: Weak wrist flexion at radiocarpal joint

Inn: Median Nerve

What is muscle D?(Origin, insertion, action, innervation)

Flexor carpi ulnaris

O: Medial Epicondyle and olecranon

Ins: Pisiform, hamate, 5th metacarpal

Act: flexes and assist with radial deviation at radiocarpal joint

Inn: ulnar Nerve

What muscle makes up the intermediate compartment of the Anterior forearm?

Flexor digitorum superficialis

what muscle is it pointing at?(Origin, insertion, action, innervation)

Flexor digitorum superficialis

O: Medial Epicondyle, radius, and coronoid process

Ins: middle phalanx 2-5

Act: Flexes MCP And PIP of 2-5, Flexes at Radiocarpal joint

Inn: Median Nerve

What muscles make up the deep compartment of the Anterior forearm?

Flexor digitorum profundus, Flexor pollicis longus, and pronator quadratus

What is the blue line pointing at?(Origin, insertion, action, innervation)

Flexor digitorum profundus

O: Anterior medial ulna

Ins: distal phalanges 2-5

Act: Flexes MCP, PIP, and DIP joints of digits 2-5

Inn: Lateral ½ -Median Nerve, Medial ½ - Ulnar nerve

What is the green line pointing at? (Origin, insertion, action, innervation)

Flexor Pollicis Longus

O: Anterior radius and interosseous membrane

Ins: base of distal phalanx of thumb

Act: Flexes MCP,IP, and CMC joints of digits thumb

Inn: Median Nerve

What is the blue box? (Origin, insertion, action, innervation)

Pronator Quadratus

O: distal ulnar shaft

Ins: distal radial shaft

Act:Pronates forearm at inferior radioulnar joint

Inn:Median Nerve

Boundaries and contents of Carpal tunnel

Lateral: trapezium

Medial: Hamate

Floor: Hamate, capitate, and trapezoid

Roof: flexor retinculum

Contents:

9 tendons and 1 nerve

4- FDS

4-FDP

1-FPL

Median nerve