Pronator Teres

Anterior- Superficial Muscle

O – medial epicondyle of the humerus

I – lateral radius

A – pronates forearm

Anterior Superficial Muscle

O – medial epicondyle of the humerus

I – base of 2^nd and 3^rd metacarpals

A – flexes the wrist and abducts hand

Anterior Superficial Muscle

O – medial epicondyle of humerus

I – palmar aponeurosis

A – weak wrist flexor; tenses skin of palm during hand movments

Anterior Superficial Muscle

O – medial epicondyle of humerus; coronoid process of ulna, shaft of radius

I – middle phalanges of fingers 2-5

A – flexes wrist and middle phalanges of fingers

Flexor Pollicis Longus

Anterior Deep Muscle

O – anterior radius and interosseous membrane

I – distal phalanx of thumb

L – parallels flexor digitorum profundus laterally, partly covered by flexor digitorum superficialis

A – flexes distal phalanx of thumb

Flexor Digitorum Profundus

Anterior Deep Muscle

O – coronoid process of ulna and interosseous membrane

I – distal phalanges of fingers 2-5

L – deep to flexor digitorum superficialis

A – slow-acting flexor of fingers; flexes distal interphalangeal joints

Anterior Deep Muscle

O – distal surface of anterior ulna

I – distal surface of anterior radius

L – deepest muscle of distal forearm

A – prime mover of forearm pronation, also helps hold ulna and radius together

Posterior Deep Muscle 

O – lateral epicondyle of humerus and proximal ulna

I – proximal end of radius

A – assists biceps brachii to supinate forearm

Posterior Deep Muscle

O – posterior surface of radius and ulna and interosseous membrane

I – base of 1^st metacarpal and trapezium

A – abducts and extends thumb, abducts wrist

Posterior Deep Muscle

O – dorsal shaft of radius and ulna, interosseous membrane

I – base of proximal (brevis) and distal (longus) phalanx of thumb

A – extends thumb

Extensor Digiti Minimi 

(portion of extensor digitorum)

Posterior Deep Muscle

(portion of extensor digitorum)

O – lateral epicondyle of humerus

I – distal phalanx of finger 5

A – extends finger 5

Posterior Deep Muscle

O – lateral supracondylar ridge of humerus

I – base of 2^nd metacarpal

A – extends and abducts wrist

Extensor Carpi Radialis Brevis

Posterior Superficial Muscle

O – lateral epicondyle of humerus

I – base of 3^rd metacarpal

A – extends and abducts wrist

Posterior Superficial Muscle

O – lateral epicondyle of humerus

I – distal phalanges of fingers 2-4

A – extends and abducts wrist

Posterior Superficial Muscle

O – lateral epicondyle of humerus and posterior ulna

I – base of 5^th metacarpal

A – extends and adducts wrist

Thenar Eminence (ball of thumb)

(intrinsic muscle of the hand that controls precise, weak movements of the hands)

O – flexor retinaculum and nearby carpals

I – lateral base of thumb’s proximal phalanx

A – abducts thumb at carpometacarpal jt.

Thenar Eminence (ball of thumb)

O – flexor retinaculum and trapezium

I – lateral side of base of proximal phalanx of thumb

A – flexes thumb at carpometacarpal and metacarpophalangeal joints

Thenar Eminence (ball of thumb)

O – capitate bone and bases of metacarpals 2-4

I – proximal phalanx of thumb

A – adducts and helps to oppose thumb

Thenar Eminence

O – flexor retinaculum and trapezium

I – anterior side of metacarpal 1

A – opposition of the thumb

Hypothenar Eminence (ball of finger)

O – pisiform bone

I – proximal phalanx of little finger

A – abducts little finger at metacarpophalangeal joint

Hypothenar Eminence (ball of the little finger)

O – hamate bone and flexor retinaculum

I – proximal phalanx of little finger

A – flexes little finger at metacarpophalangeal joint

Hypothenar Eminence (ball of little finger)

O – hamate bone and flexor retinaculum

I – medial side of metacarpal 5

A – helps in opposition 

Midpalmar Muscle

O – sides of metacarpals

I – extensor expansion over 1^st phalanx of fingers 2-4 on side opposite midaxis of hand and both sides of finger 3

A – abduct (diverge) fingers

Palmar Interossei

Midpalmar Muscle

O – the side of each metacarpal that faces the midaxis of the hand

I – extensor expansion on 1^st phalanx of each finger (except finger 3) on side facing midaxis of hand

A – adducts fingers

to move away from the midline of the body. When indicating movement of the fingers or toes, it means spreading them apart

Think of an alien _____!

to move toward the midline of the body. 

When talking of the digits, toward the midline of the hand or foot

Thinking of adding more too the width of body

the outward rotation of the forearm causing the 

palms face anteriorly

Front

Hands face forward...PALMS UP!

Anterior Superficial Muscle

O – medial epicondyle of humerus; coronoid process of ulna, shaft of radius

I – middle phalanges of fingers 2-5

A – flexes wrist and middle phalanges of fingers