326: Arm muscle OIAI

State the Origin, Insert, Action, Innervation (N) for the Deltoid muscle

Origin:

Anterior head: lateral clavicle

Middle head: acromion process of scapula

Posterior head: spine of scapula

Insert: Deltoid tuberosity (of humerus)

Action:

All heads: abduction of the arm

Anterior head: flexion of arm, horizontal flexion/adduction of arm, and medial rotation

Posterior head: extension/hyperextension of arm, horizontal extension/adduction of arm and lateral rotation of arm

Innervation: Axillary nerve

State the Origin, Insert, Action, Innervation (N) for the Teres Major muscle

O: Inferior angle and lateral border of scapula

I: Intertubercular groove of humerus

A: Adduction of arm; medial rotation; extension of arm

N: Subscapular nerve

State the Origin, Insert, Action, Innervation (N) for the Teres Minor muscle

O: Lateral border of scapula

I: Greater tuberosity of humerus

A: Lateral rotation of arm; stabilization of the GHJ

N: Axillary nerve

State the Origin, Insert, Action, Innervation (N) for the Supraspinatus muscle

O: Supraspinous fossa of scapula

I: Greater tuberosity of humerus

A: Abduction of arm; stabilization of GHJ

N: Suprascapular nerve

State the Origin, Insert, Action, Innervation (N) for the Infraspinatus muscle

O: Infraspinous fossa of scapula

I: Greater tuberosity of humerus (posteroinferior to supraspinatus)

A: External rotation of arm; stabilization of GHJ

N: Suprascapular nerve

State the Origin, Insert, Action, Innervation (N) for the Subscapularis muscle

O: Subscapular fossa of scapula (on anterior scapula!)

I: Lesser tuberosity of humerus

A: Medial rotation of arm; stabilization of GHJ

N: Subscapular nerve

State the Origin, Insert, Action, Innervation (N) for the Biceps brachii muscle

O: Long head: Supraglenoid tubercle of the scapula

Short head: coracoid process of the scapula

I: Radial tuberosity + bicipital aponeurosis

A: Both heads: Flexion of forearm, supination of forearm

Long head: flexion of arm (weakly)

N: Musculocutaneous nerve

State the Origin, Insert, Action, Innervation (N) for the Coracobrachialis muscle

O: Coracoid process of scapula

I: Body of humerus

A: flexion of arm; adduction of arm; medial rotation of arm

N: Musculocutaneous nerve

State the Origin, Insert, Action, Innervation (N) for the Brachilais muscle

O: Body of humerus

I: Ulnar tuberosity

A: Flexion of forearm

N: Musculocutaneous nerve + radial nerve

State the Origin, Insert, Action, Innervation (N) for the Triceps brachii muscle

O:

Long head: infraglenoid tubercle of scapula

Lateral head: Body of humerus, superior to the radial groove

Medial head: (deep) body of humerus, inferior to the radial groove

I: Posterior olecranon process of ulna

A:

All heads: Extension of forearm

Long head: extension of arm; adduction of arm

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Anconeus muscle

O: Lateral epicondyle of the humerus

I: Olecranon and superior posterior surface of the ulna

A: Extension of forearm; stabilization during pronation/supination

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Brachioradialis muscle

O: Lateral supracondylar ridge of the humerus

I: Styloid process of the radius

A: Flexion of forearm; pronation and supination of forearm (depending on position of forearm)

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Pronator teres muscle

O: Medial epicondyle of humerus

I: Lateral surface of radius

A: Pronation and flexion of forearm

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Flexor carpi radialis muscle

O: Medial epicondyle of humerus

I: Base of 2nd metacarpal

A: Flexion of hand; abduction/radial deviation of hand

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Palmaris longus muscle

O: Medial epicondyle of humerus

I: Palmar aponeurosis

A: Flexion of hand; weak flexion of forearm; tenses palmar aponeurosis

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Flexor carpi ulnaris muscle

O: Medial epicondyle + olecranon of ulna

I: Base of 5th metacarpal; hook of the hamate; pisiform bone

A: Flexion of hand; adduction/ulnar deviation of hand

N: Ulnar nerve

State the Origin, Insert, Action, Innervation (N) for the Flexor digitorum superficialis muscle

O: Medial epicondyle of humerus, coronoid process of ulna, upper surface of radius

I: Middle phalanges of digits 2-5

A: Flexion of proximal and middle phalanges of digits 2-5, flexion of hand, weak flexion of forearm

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Flexor digitorum profundus muscle

O: Anterior surface of the ulna; interosseous membrane

I: distal phalanges of digits 2-5

A: flexion of proximal, middle and distal phalanges of digits 2-5, flexion of hand

N: Median nerve (laterally); ulnar nerve (medially)

State the Origin, Insert, Action, Innervation (N) for the Flexor pollicis longus muscle

O: Anterior surface of the radius; interosseous membrane

I: distal phalanx of digit 1 (thumb)

A: flexion of proximal and distal phalanges of digit 1 (thumb); abduction of hand/radial deviation; flexion of hand

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Pronator Quadratus muscle

O: Distal ulna

I: Distal Radius

A: Pronation of forearm

N: Median nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor carpi radialis longus muscle

O: Lateral supracondylar ridge of the humerus

I: Dorsal base of second metacarpal

A: Extension of hand; abduction/radial deviation of hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor carpi radialis brevis muscle

O: Lateral epicondyle of the humerus

I: Dorsal base of the third metacarpal

A: Extension of the hand at the wrist; abduction/radial deviation of the hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor digitorum muscle

O: Lateral epicondyle of the humerus

I: Dorsal bases of distal and middle phalanges of digits 2-5

A: Extension of digits 2-5; abduction of fingers

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor digiti minimi muscle

O: Lateral epicondyle of the humerus

I: Dorsal aponeurosis (middle and distal phalanges) of 5th digit

A: Extention of 5th digit; adduction/ulnar deviation of hand; extensions of hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor carpi ulnaris muscle

O: Lateral epicondyle of the humerus; posterior surface of the ulna

I: Dorsal base of 5th metacarpal

A: Extension of hand; adduction/ulnar deviation of had

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Supinator muscle

O: Lateral epicondyle of the humerus; supinator crest of the ulna

I: Posterior surface of radius

A: Supination of the forearm

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Abductor pollicis longus muscle

O: Dorsal surface of radius and ulna and adjacent interosseous membrane

I: Lateral side of the base of 1st metacarpal

A: Abduction of thumb; abduction/radial deviation of hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor pollicis brevis muscle

O: Posterior surface of the radius; interosseous membrane

I: Dorsal base of the 1st proximal phalanx

A: Extension of the thumb; abduction/radial deviation of hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor pillicis longus muscle

O: Posterior surface of the ulna; interosseous membrane

I: Dorsal base of the 1st distal phalanx

A: Extension of the thumb; abduction of hand

N: Radial nerve

State the Origin, Insert, Action, Innervation (N) for the Extensor indicis muscle

O: Posterior distal ulna; interosseous membrane

I: DIstal aponeurosis of the 2nd digit

A: Extension of digit 2, extension of the hand

N: Radial nerve

State the Action, Innervation (N) for the Abductor pollicis brevis muscle

O: (do not need to know)

I: (do not need to know)

A: Abduction of digit 1

N: Median nerve

(Note: most lateral/superficial of the hand muscles)

State the Action, Innervation (N) for the Flexor pollicis brevis muscle

A: Flexion of digit 1

N: Median nerve

State the Action, Innervation (N) for the Opponens pollicis muscle

A: Opposition of 1st digit

N: Median nerve

State the Action, Innervation (N) for the Abductor digiti minimi muscle

A: Abduction of digit 5

N: Ulnar nerve

State the Action, Innervation (N) for the Flexor digiti minimi muscle

A: Flexion of digit 5

N: Ulnar nerve

State the Action, Innervation (N) for the Opponens digiti minimi muscle

A: Opposition of digit 5

N: Ulnar nerve