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Muscles of the Forearm
Lab One Anatomy Two
34
Anatomy
Undergraduate 3
02/07/2011

Additional Anatomy Flashcards

 


 

Cards

Term

Pronator Teres

Definition

Anterior- Superficial Muscle

O – medial epicondyle of the humerus

I – lateral radius

A – pronates forearm

 

Term
Flexor Carpi Radialis
Definition

Anterior Superficial Muscle

O – medial epicondyle of the humerus

I – base of 2nd and 3rd metacarpals

A – flexes the wrist and abducts hand

 

Term
Palmaris Longus
Definition

Anterior Superficial Muscle

O – medial epicondyle of humerus

I – palmar aponeurosis

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

 

Term
Flexor Carpi Ulnaris
Definition

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

 

Term

Flexor Pollicis Longus

Definition

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

 

Term

 

Flexor Digitorum Profundus

 

Definition

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

 

Term
Prontator Quadratus
Definition

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

 

Term
Supinator
Definition

Posterior Deep Muscle 

O – lateral epicondyle of humerus and proximal ulna

 

I – proximal end of radius

A – assists biceps brachii to supinate forearm

Term
Abductor Pollicus Longus
Definition

Posterior Deep Muscle

O – posterior surface of radius and ulna and interosseous membrane

I – base of 1st metacarpal and trapezium

A – abducts and extends thumb, abducts wrist

 

Term
Extensor Pollicis Brevis and Longus
Definition

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

 

Term

Extensor Digiti Minimi 

(portion of extensor digitorum)

Definition

Posterior Deep Muscle

(portion of extensor digitorum)

O – lateral epicondyle of humerus

I – distal phalanx of finger 5

A – extends finger 5

 

Term
Extensor Carpi Radialis Longus
Definition

Posterior Deep Muscle

O – lateral supracondylar ridge of humerus

I – base of 2nd metacarpal

A – extends and abducts wrist

 

Term

Extensor Carpi Radialis Brevis

 

Definition

Posterior Superficial Muscle

O – lateral epicondyle of humerus

I – base of 3rd metacarpal

A – extends and abducts wrist

 

Term
Extensor Digitorum
Definition

Posterior Superficial Muscle

O – lateral epicondyle of humerus

I – distal phalanges of fingers 2-4

A – extends and abducts wrist

 

Term
Extensor Carpi Ulnaris
Definition

Posterior Superficial Muscle

O – lateral epicondyle of humerus and posterior ulna

I – base of 5th metacarpal

A – extends and adducts wrist

 

 

Term
Abductor pollicis brevis
Definition

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.

 

 

Term
Flexor pollicis brevis
Definition

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

 

Term
Adductor Pollicis
Definition

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

 

Term
Opponens Pollicis
Definition

Thenar Eminence

 

O – flexor retinaculum and trapezium

I – anterior side of metacarpal 1

A – opposition of the thumb

 

Term
Abductor digiti minimi
Definition

Hypothenar Eminence (ball of finger)

 

O – pisiform bone

I – proximal phalanx of little finger

A – abducts little finger at metacarpophalangeal joint

 

Term
Flexor digiti minimi brevis
Definition

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

 

Term
Opponens digiti minimi
Definition

Hypothenar Eminence (ball of little finger)

 

O – hamate bone and flexor retinaculum

I – medial side of metacarpal 5

A – helps in opposition 

 

Term
Dorsal Interossei
Definition

Midpalmar Muscle

 

O – sides of metacarpals

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

A – abduct (diverge) fingers

 

Term

Palmar Interossei

 

Definition

Midpalmar Muscle

 

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

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

A – adducts fingers

 

Term
Origin
Definition
this is the attachment of a muscle that remains relatively fixed during muscular contraction
Term
Insertion
Definition
this is the movable attachment of the muscle; usually this is the distal part 
Term
Abduct
Definition

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 _____!

Term
Adduct
Definition

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

Term
Pronation
Definition
the inward rotation of the forearm causing the radius to cross diagonally over the ulna-palms face posteriorly
Term
Supination
Definition

the outward rotation of the forearm causing the 

palms face anteriorly

Term
Opposition
Definition
action taken when you touch your thumbs to the tips of the other fingers on the same hand
Term
Posterior
Definition
The back (dorsal)
Term
Anterior
Definition

Front

Hands face forward...PALMS UP!

Term
Flexor Digitorum Superficialis
Definition

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

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