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Classes > Forearm/hand joint > Flashcards

Forearm/hand joint Flashcards

1
Q

Extensor carpi radialis longus

A

Origin -
lateral supracondylar ridge of the humerus
The lateral intermuscular septum of the arm
Insertion- The dorsal aspect of the base of the second metacarpal bone
Action -Extends the hand at the wrist joint, Abducts the hand at the wrist and midcarpal joints
Innervation - The radial nerve

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2
Q

Extensor carpi radialis brevis

A

Origin -Lateral epicondyle of the humerus
Insertion-Dorsal aspect of the base of the third metacarpal bone
Action - Wrist extension and hand abduction
Innervation -Deep branch of the radial nerve

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3
Q

Extensor indicis

A

Origin -Posterior surface of the distal ulna and interosseous membrane
Insertion: Extensor expansion of the index finger
Action: Extends the index finger
Innervation: Posterior interosseous nerve (C7, C8)

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4
Q

Extensor digitorum

A

Origin - Lateral epicondyle of the humerus
Insertion: Dorsal surface of the middle and distal phalanges of digits 2-5 (index, middle, ring, and little fingers)
Action: Extends the fingers at the metacarpophalangeal and interphalangeal joints
Innervation: Posterior interosseous nerve (a branch of the radial nerve

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5
Q

Extensor digiti minimi

A

Origin: Lateral epicondyle of the humerus
Insertion: Extensor expansion of the little finger
Action: Extends the little finger
Innervation: Posterior interosseous nerve (C7, C8)

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6
Q

Extensor carpi ulnaris

A

Origin: Lateral epicondyle of the humerus and posterior border of the ulna
Insertion: Base of the fifth metacarpal bone
Action: Wrist extension and ulnar deviation (adduction)
Innervation: Posterior interosseous nerve (C7, C8)

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7
Q

Abductor pollicis longus

A

Origin - posterior surfaces of the radius and ulna bones
Insertion- lateral aspect of the base of the first metacarpal bone
Action - abducts the thumb and extends it at the carpometacarpal joint
Innervation -posterior interosseous nerve

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8
Q

extensor pollicis brevis

A

Origin: Posterior surface of the distal radius and adjacent interosseous membrane
Insertion: Base of the proximal phalanx of the thumb
Action: Extends the thumb at the carpometacarpal and metacarpophalangeal joints
Innervation: Posterior interosseous nerve (C7, C8)

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9
Q

Extensor pollicis longus

A

Origin: Posterior surface of the middle third of the ulna and the interosseous membrane
Insertion: Base of the distal phalanx of the thumb
Action: Extends the thumb at the metacarpophalangeal and interphalangeal joints
Innervation: Posterior interosseous nerve (a branch of the radial nerve)

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10
Q

Flexor carpi radialis

A

Origin: Medial epicondyle of the humerus
Insertion: Base of the second and third metacarpal bones
Action: Wrist flexion and radial deviation (hand abduction)
Innervation: Median nerve (C6-C7)

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11
Q

Palmaris longus

A

Origin - medial epicondyle of the humerus.
Insertion- palmar aponeurosis and the distal half of the flexor retinaculum.
Action - flexes the hand at the wrist
Innervation - median nerve (C7, C8)

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12
Q

Flexor carpi ulnaris

A

Origin: Medial epicondyle of humerus (humeral head), olecranon and posterior border of ulna (ulnar head)
Insertion: Pisiform bone, hook of hamate, and base of the 5th metacarpal bone
Action: Wrist flexion and adduction
Innervation: Ulnar nerve (C7-T1)

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13
Q

flexor digitorum superficialis

A

Origin -
Humeral head: Medial epicondyle of humerus
ulnar head: coronoid process of ulna
Radial head: below radial tuberosity
Insertion- Sides of middle phalanges of digits 2-3
Action -flexes the proximal interphalangeal (PIP) and metacarpophalangeal (MCP)
Innervation - the median nerve

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14
Q

Flexor pollicis longus

A

Origin: The anterior surface of the radius and the interosseous membrane of the forearm
Insertion: The palmar aspect of the base of the thumb’s distal phalanx
Action: Flexes the thumb’s interphalangeal and metacarpophalangeal joints. It may also help flex the wrist
Innervation: The anterior interosseous nerve, which comes from the median nerve

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15
Q

Flexor digitorum profundus

A

Origin - Proximal half of anterior surface of ulna, interosseous membrane
Insertion-Palmar surfaces of distal phalanges of digits 2-5
Action -Metacarpophalangeal and interphalangeal joints 2-5: Finger flexion
Innervation -
The medial part of the FDP is innervated by the ulnar nerve
The lateral part of the FDP is innervated by the anterior interosseous branch of the median nerve

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16
Q

Interossei (palmer/dorsal)

A

Origin: Lateral and medial surfaces of the metacarpal bones.
Insertion: Base of the proximal phalanx and extensor expansion of the finger.
Action:
Palmar Interossei: Adduction of fingers
Dorsal Interossei: Abduction of fingers
Innervation: Deep branch of the ulnar nerve

17
Q

Lumbricals

A

Origin: Tendons of the flexor digitorum profundus
Insertion: Radial aspect of the extensor expansions of the fingers
Action: Flexion at the metacarpophalangeal joint, extension at the interphalangeal joints
Innervation:
Lateral two lumbricals: Median nerve
Medial two lumbricals: Deep branch of the ulnar nerve

18
Q

Adductor pollicis

A

Origin - ransverse head: Palmar base of metacarpal bone 3
Oblique head: Capitate bone, palmar bases of metacarpal bones 2 & 3
Insertion- Medial base of proximal phalanx 1
Action - Thumb adduction
Innervation - deep branch of the ulnar nerve

19
Q

Adductor pollicis brevis

A

Origin - Tubercles of scaphoid and trapezium bones
Insertion- Lateral aspect of base of proximal phalanx 1
Action -Thumb abduction
Innervation - recurrent branch of the medial nerve

20
Q

Opponens pollicis

A

Origin: Tubercle of trapezium bone and flexor retinaculum
Insertion: Lateral side of the first metacarpal bone
Action: Thumb opposition
Innervation: Recurrent branch of the median nerve

21
Q

Flexor pollicis brevis

A

Origin -
Superficial head: Flexor retinaculum, tubercle of trapezium bone
Deep head: Trapezoid and capitate bones
Insertion-Lateral aspect of base of proximal phalanx 1
Action -Thumb flexion
Innervation - Superficial head: Recurrent branch of median nerve
Deep head: Deep branch of ulnar nerve (C8, T1)

22
Q

Abductor digiti minimi

A

Origin: Pisiform bone and flexor carpi ulnaris tendon
Insertion: Medial side of the base of the proximal phalanx of the little finger
Action: Abducts the little finger
Innervation: Deep branch of the ulnar nerve (C8-T1)

23
Q

Flexor digiti minimi brevis

A

Origin: Hook of hamate bone and flexor retinaculum
Insertion: Medial side of the base of the proximal phalanx of the little finger
Action: Flexion of the little finger at the metacarpophalangeal joint
Innervation: Deep branch of the ulnar nerve

24
Q

Opponens digiti minimi

A

Origin - Hook of hamate bone, flexor retinaculum
Insertion- Ulnar aspect of metacarpal bone 5
Action - Finger flexion, finger lateral rotation/opposition
Innervation - Deep branch of ulnar nerve (C8, T1)

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