EXSC 418 Exam 2 Muscle OIA

Brachioradialis Origin:

Lateral supracondylar ridge of humerus

Brachioradialis Insertion

Lateral distal end of the radius

Brachioradialis Action

Flex forearm

Brachioradialis Blood supply

Branch of radial artery (radial recurrent A)

Extensor Carpi Radialis Longus Origin

Lateral supracondylar ridge of humerus

Extensor Carpi Radialis Longus Insertion

Base of the second metacarpal

Extensor Carpi Radialis Longus Action

Extension of hand at wrist, abduction (radial abduction) of hand at wrist

Extensor Carpi Radialis Longus Blood supply

Radial Artery

Extensor Carpi Radialis Brevis Origin

Lateral epicondyle of humerus

Extensor Carpi Radialis Brevis Insertion

Base of the 3rd metacarpal

Extensor Carpi Radialis Brevis Action

Extension of the hand at wrist, abduction (radial abduction) of hand at wrist

Extensor Carpi Radialis Brevis Blood supply

Radial Artery

Extensor Digitorum Origin

Lateral epicondyle of the humerus

Extensor Digitorum Insertion

Middle and distal phalanges of digits 2-5

Extensor Digitorum Action

Extends all joints (MCP, PIP, DIP) of digits 2-5

Extensor Digitorum Blood supply

Branches of Ulnar artery (interosseous recurrent A and posterior interosseous A)

Posterior Forearm Muscles Innervation

Radial N (under brachioradialis)

Extensor Digiti Minimi Origin

Lateral epicondyle of the humerus

Extensor Digiti Minimi Insertion

Middle and distal phalanges of digits 5

Extensor Digiti Minimi Actions

Extends all joints (MCP, PIP, DIP) of digit 5

Extensor Digiti Minimi Blood supply

Branches of Ulnar Artery (interosseous recurrent A)

Extensor Carpi Ulnaris Origin

Lateral epicondyle of the humerus

Extensor carpi Ulnaris Insertion

Base of 5th metacarpal

Extensor Carpi Ulnaris Action

Extension and adduction (ulnar abduction) hand at wrist

Extensor Carpi Ulnaris Blood supply

Ulnar Artery

Supinator Origin

Lateral epicondyle of humerus, supinator crest and fossa of ulna

Supinator Insertion

Proximal 1/3 of the radius

Supinator Action

Supination of the forearm

Supinator Blood supply

Branches of the ulnar Artery (interosseous recurrent A)

Abductor Pollicis Longus Origin

Posterior surface of the radius and ulna

Abductor Pollicis Longus Insertion

Base of metacarpal 1

Abductor pollicis longus Action

Abduction of the thumb, extension of thumb

Abductor pollicis longus Blood supply

Branches of ulnar artery (posterior interosseous A)

Extensor Pollicis Brevis Action

Extension of proximal phalanx of thumb

Extensor Pollicis Longus Origin:

Posterior surface of ulna

Extensor Pollicis Longus Insertion:

Base of distal Phalanx of thumb

Extensor Pollicis Longus Action

Extension of distal phalanx of thumb

Extensor Pollicis Longus Blood supply

Branches of the ulnar artery ( posterior interosseous A)

Exentsor Indicis Action

Extension of all joints (MCP, PIP, DIP) of digits 2

Dorsal Interossei Action

abduct digits 2, 4 abduct digits 3 towards the radius or ulna

Pronator Teres Origin

Medial epicondyle of the humerus, coronoid process of ulna

Pronator Teres Insertion

Middle of the radius

Pronator Teres Action

Pronation of the forearm

Pronator Teres Innervation

Median Nerve

Anterior Forearm muscles blood supply

Ulnar Artery

Flexor Carpi Radialis Origin

Medial Epicondyle of the humerus

Flexor Carpi Radialis Innervation

Base of second metacarpal

Flexor Carpi Radialis Action

Flexion of hand at wrist, abduction (radial abduction) of hand

Flexor Carpi Radialis Innervation

Median Nerve

Palmaris Longus Origin

Medial epicondyle of humerus

Palmaris Longus Insertion

Palmar aponeurosis

Palmaris longus Action

Flexion of hand at wrist hand

Palmaris longus Innervation

Median Nerve

Flexor Carpi Ulnaris Origin

Medial epicondyle of humerus, olecranon process, and posterior border of ulna

Flexor Carpi Ulnaris Insertion

Pisiform, hamate, fifth metacarpal

Flexor Carpi Ulnaris Action

Flexion of hand at wrist, adduction (ulnar abduction) of hand

Flexor digitorum Superficialis Origin

Medial epicondyle of humerus, coronoid process of ulna, superior half of radius

Flexor digitorum superficialis insertion

Middle phalanges of digits 2-5

Flexor digitorum Superficialis Action

Flex middle phalanges of digits 2-5 at PIP

Flexor digitorum superficialis Innervation

Median Nerve

Flexor Digitorum profundus Origin

Proximal ¾ of ulna

Flexor digitorum profundus insertion

Base of distal phalanges of digits 2-5

Flexor digitorum profundus Action

flex distal phalanges of digits 2-5 at DIP

Flexor Digitorum Profundus Innervation

Median Nerve (radial half), Ulnar nerve (ulnar half)

Flexor pollicis longus origin

Anterior surface of radius

Flexor pollicis longus Insertion

Base of distal phalanx of thumb

Flexor Pollicis longus Action

Flexion of distal phalanx of thumb

Flexor Pollicis longus Innervation

Branches of Ulnar Nerve

Pronator Quadratus Origin

Distal end of ulna

Pronator quadratus insertion

Distal end of radius

Pronator Quadratus Action

Pronate forearm and hand

Pronator quadratus Innervation

Median Nerve

Diaphram Origin

Diploid process of sternum, lower ribs, bodies of upper lumbar vertebrae

Diaphragm Insertion

Central tendon of diaphragm

Diaphragm Action

Increases voumne of thoracic cavity for inspiration

Diaphragm Innervation

Phrenic Nerve

External Intercostals origin

Lower border of superior rib

External Intercostals Insertion

Superior border of the inferior rib

External Intercostals Action

Lift lower rib to expand thoracic cavity for inspiration

External intercostals Innervation

Intercostal nerves (T1-T12)

Internal Intercostals Action

Pull upper rib downward to collapse thoracic cavity for expiration

Transverse thoracic Action

Pulls upper rib downward and medially to collapse thoracic cavity for expiration

Rectus abdominus Origin

Pubic crest and pubic symphysis

Rectus abdominus Insertion

xiphoid process of sternum, cartilage of ribs 5-7

Rectus abdominus Action

Flexion of trunk, assists in forced expiration, defecation, urination, and parturition

Rectus abdominis Innervation

Ventral rami spinal nerves (T7-T12)

External Oblique Origin

Inferior eight ribs

External Oblique insertion

Iliac Crest of Ilium, Pubis, linea alba

External Obliques Action

Compression of abdomen, flexion of trunk, rotation of trunk, forced expiration, defecation, urination, parturition

External Oblique Innervation

Ventral Rami spinal nerves (T7-T12)

Internal Oblique Origin

Iliac crest of ilium, thoracolumbar fascia

Internal oblique insertion

Cartilage of inferior 3 or 4 ribs, linea alba

Internal oblique Action

Compression of abdomen, flexion of trunk, rotation of trunk, forced expiration, defecation, urination, partition

Internal oblique innervation

Ventral Rami Spinal Nerves (T7-T12)

Transverse abdominis Action

Compress abdomen, forced expiration, defecation, urination, partition