Muscle Cards Exam Two

Triceps Brachii origin

Long head - infraglenoid tubercle of the scapula; lateral head - lateral and posterior surface of the proximal half of the humerus; medial head - distal, medial, and posterior surfaces of the humerus below radial groove

Triceps Brachii insertion

posterior surface of the olecranon process of the ulna

Tricep Brachii action

extends elbow joint, long head add and extends should joint

Triceps Brachii nerve

radial C7, 8

Anconeus origin

lateral epicondyle of the humerus, posterior surface

Anconeus insertion

lateral side of the olecranon process and upper posterior surface of ulna

Anconeus action

extends the elbow joint and stabilizes the ulna during pronation and supination

Anconeus nerve

Radial C7, 8

Supinator origin

lateral epicondyle of humerus and supinator crest of ulna

Supinator insertion

lateral surface of the upper radius

Supinator action

supinates the forearm

Supinator nerve

Radial C6

Pronator Quadratus origin

distal, medial anterior surface of the ulna

Pronator Quadratus insertion

distal, lateral anterior surface of the radius

Pronator Quadratus action

pronates the forearm

Pronator Quadratus nerve

Median C8, T1

Biceps Brachii origin

short head - coracoid process of scapula; long head - supraglenoid tubercle of the scpaula

Biceps Brachii insertion

radial tuberosity

Biceps Brachii action

flexes the shoulder, short head add and long head abd; flexes and supinates elbow joint

Biceps Brachii nerve

musculocutaneous C5,6

Brachialis origin

distal half of anterior surface of the humerus

Brachialis insertion

tuberosity and coronoid process of the ulna

Brachialis action

flexes the elbow joint

Brachialis nerve

musculocutaneous, small branch of radial C5,6

Brachioradialis origin

proximal lateral supracondylar ridge of humerus

brachioradialis insertion

lateral side of the base of styloid process of the radius

Brachioradialis action

flexes the elbow joint, pronates and supinates the forearm during resistance

Brachioradialis nerve

radial C5, 6

Pronator Teres origin

humeral head - common felxor tendon of the medial epicondyle of the humerus; ulnar head - medial side of the coronoid process of the ulna

Pronator teres insertion

middle of the lateral surface of the radius

Pronator Teres action

pronates the forearm, flexion of elbow joint

Pronator Teres nerve

Median C6, 7

Extensor Digitorum origin

common extensor tendon from the lateral epicondyle of the humerus

Extensor Digitorum insertion

by 4 tendons on the dorsum of the 2nd-5th digits and dividing over the proximal phalanx into a medial and 2 lateral bands; medial band - inserts on base of middle phalanx; lateral band - reunite over the middle phalanx on base of distal phalanx

Extensor Digitorum action

extends MCP and IP joints of 2-5 digits; abd the index, ring and little fingers; extension and abd of wrist

Extensor Digitorum nerve

Radial C6, 7, 8

Extensor Digiti Minimi origin

common extensor tendon from the lateral epicondyle of humerus

Extensor Digiti Minimi insertion

extensor expansion of the little finger with extensor digitorum; medial band - base of the middle phalanx; 2 lateral bands - reunite over the middle phalanx to insert on the base of the distal phalanx of little finger

Extensor Digiti Minimi action

Extends PIP, DIP, and MCP joints of the little finger; assists in abd of the little finger

Extensor Digiti Minimi nerve

Radial C7, 8

Extensor Indicis origin

posterior surface of the ulna, distal to origin of extensor pollicis longus

Extensor Indicis insertion

extensor expansion of index finger with extensor digitorum; medial band - base of middle phalanx; 2 lateral bands - reunite over middle phalanx to insert on the base of the distal phalanx of index finger

Extensor Indicis action

extends the PIP, DIP, and MCP joints of index finger and abd index finger

Extensor Indicis nerve

Radial C7, 8

Flexor Digitorum Superficialis origin

humeral head - common flexor tendon from medial epicondyle of humerus; ulnar head - medial side of coronoid process; radial head - oblique side of radius

Flexor Digitorum Superficialis insertion

by 4 tendons into sides of middle phalanges to digits 2-5

Flexor Digitorum Superficialis action

Flexes PIP and MCP joints of digits 2-5, flexes wrist

Flexor Digitorum Superficialis nerve

Median C7, 8, T1

Flexor Digitorum Profundus origin

anterior medial surface of proximal ulna

Flexor Digitorum Profundus insertion

by 4 tendons into the bases of distal phalanges of digits 2-5

Flexor Digitorum Profundus action

Flexes DIP, PIP, and MCP joints of digits 25, flexes wrist

Flexor Digitorum Profundus nerve

1st and 2nd - median C8, T1; 3rd and 4th - ulnar C8, T1

Flexor Carpi Radialis origin

common flexor tendon from medial epicondyle of humerus

Flexor Carpi Radialis insertion

base of second MC and a slip to base of third MC

Flexor Carpi Radialis action

flexes and abd the wrist, pronation, and flexion of elbow joint

Flexor Carpi Radialis nerve

Median C6, 7

Flexor Carpi Ulnaris origin

humeral head - common flexor tendon from medial epicondyle of humerus; ulnar head - proximal posterior border of ulna

Flexor Carpi Ulnaris insertion

pisiform bone and the hamate and 5th MC by ligaments

Flexor Carpi Ulnaris action

flexes and add wrist, elbow flexion

Flexor Carpi Ulnaris nerve

Ulnar C8

Extensor Carpi Radialis Longus origin

distal lateral supracondylar ridge of the humerus

Extensor Carpi Radialis Longus insertion

dorsal surface of the base of the 2nd metacarpal bone, radial side

Extensor Carpi Radialis Longus action

extends and abd the wrist, flexes the elbow

Extensor Carpi Radialis Longus nerve

Radial C6, 7

Extensor Carpi Radialis Brevis origin

common extensor tendon from lateral epicondyle of the humerus

Extensor Carpi Radialis Brevis insertion

dorsal surface of the base of the 3rd MC bone

Extensor Carpi Radialis Brevis action

extends and abd the wrist

Extensor Carpi Radialis Brevis nerve

Radial C6, 7

Extensor Pollicis Longus origin

middle third of the posterior surface of ulna distal to origin of abductor pollicis longus

Extensor Pollicis Longus insertion

dorsal surface of base of the distal phalanx of thumb

Extensor Pollicis Longus action

extends the IP, MCP and CMC joints of the thumb, abd and extension of wrist

Extensor Pollicis Longus nerve

Radial C7, 8

Extensor Carpi Ulnaris origin

common extensor tendon from the lateral epicondyle of the humerus

Extensor Carpi Ulnaris insertion

base of the 5th MC, ulnar side

Extensor Carpi Ulnaris action

extends and add the wrist

Extensor Carpi Ulnaris nerve

Radial C7, 8

Extensor Pollicis Brevis origin

posterior surface of body of radius distal to origin of abductor pollicis longus

Extensor Pollicis Brevis insertion

dorsal surface of base of proximal phalanx of thumb

Extensor Pollicis Brevis Action

extends MCP joint, extends and abd CMC join, abd wrist

Extensor Pollicis Brevis nerve

Radial C7,8

Flexor Pollicis Longus origin

anterior surface of body of radius below the tuberosity, medial border of coronoid process of ulna, and/or the medial epicondyle of humerus

Flexor Pollicis Longus insertion

palmar surface of base of distal phalanx of thumb

Flexor Pollicis Longus Action

flexes IP, MCP, and CMC joints of thumb; flexes wrist

Flexor Pollicis Longus nerve

Median C8, T1

Flexor Pollicis Brevis origin

superficial head - trapezium bone; deep head - trapezoid and capitate bones

Flexor Pollicis Brevis insertion

radial side of base of proximal phalanx of thumb and extensor expansion

Flexor Pollicis Brevis action

flexes CMC and MCP joints of thumb, opposes thumb, extends IP joint via attachment to extensor expansion

Flexor Pollicis Brevis nerve

superficial head - Median C6, 7, 8, T1; deep head - Ulnar C8, T1

Adductor Pollicis origin

oblique fibers - capitate bone and bases of 2nd and 3rd MC bones; transverse fibers - palmar surface of 3rd MC bone

Adductor Pollicis insertion

oblique head - extensor expansion of proximal phalanx of thumb; transverse head - ulnar side of base of proximal phalanx of thumb

Adductor Pollicis action

add CMC joint, flexes MCP joint, opposes thumb toward little finger, extends IP joints due to oblique fibers

Adductor Pollicis nerve

Ulnar C8, T1

Abductor Pollicis Brevis origin

tubercle of the trapezium bone and tubercle of the scaphoid bone

Abductor Pollicis Brevis insertion

radial side of base of proximal phalanx of thumb and extensor expansion

Abductor Pollicis Brevis action

abd the CMC joint of thumb ventrally perpendicular to the plane of palm; extends IP joint of thumb via attachment to extensor expansion; opposes, flexes, medially rotates CMC joint of thumb

Abductor Pollicis Brevis nerve

Median C6, 7, 8, T1

Abductor Pollicis Longus origin

posterior surface of body of ulna distal to origin of supinator, posterior surface of middle radius

Abductor Pollicis Longus insertion

radial side of base of 1st MC bone

Abductor Pollicis Longus action

abd and extends CMC joint of thumb, add and flexes wrist

Abductor Pollicis Longus nerve

Radial C7, 8