Upper Extremity Muscles: Action Flashcards
This muscle is responsible for thumb adduction.
Adductor pollicis
This muscle flexes metacarpophalangeal joint of thumb
Flexor pollicis brevis
Both palmar and dorsal interossei (1)_____ MCP joints and (2)_____ IP joints
- flex
- extend
This muscle corrugates skin to improve grip of palm
Palmaris Brevis
Determine the muscles described by its action.
- Extends elbow joint
- Pronation & flexion of forearm
- Pronates forearm
A. Anconeus
B. Extensor carpi radialis longus
C. Pronator quadratus
D. Pronator teres
E. Extensor digitorum
- A
- D
- C
Determine the muscles described by its action.
- Pulls thumb medially and forward across palm
- Abduction of thumb
- Flexes metacarpophalangeal joint of thumb
- Adduction of thumb
A. Flexor pollicis brevis
B. Abductor pollicis brevis
C. Opponens pollicis
D. Adductor pollicis
- C
- B
- A
- D
TRUE OR FALSE: Palmar interossei abduct fingers toward center of third finger
False.
It adducts.
This muscle flexes MCP joints and extend IP joints of fingers except thumb.
Lumbricals
Determine the action of the Flexor carpi radialis
A. Flexes hand
B. Flexes distal phalanx of thumb
C. Flexes middle phalanx of fingers and assists in
flexing proximal phalanx and hand
D. Flexes and adducts hand at wrist joint
E. Flexes and abducts hand at wrist joint
E. Flexes and abducts hand at wrist joint
Determine the action of the Flexor digitorum superficialis
A. Flexes hand
B. Flexes distal phalanx of thumb
C. Flexes middle phalanx of fingers and assists in
flexing proximal phalanx and hand
D. Flexes and adducts hand at wrist joint
E. Flexes and abducts hand at wrist joint
C. Flexes middle phalanx of fingers and assists in
flexing proximal phalanx and hand
Determine the action of the Flexor carpi ulnaris.
A. Flexes hand
B. Flexes distal phalanx of thumb
C. Flexes middle phalanx of fingers and assists in
flexing proximal phalanx and hand
D. Flexes and adducts hand at wrist joint
E. Flexes and abducts hand at wrist joint
D. Flexes and adducts hand at wrist joint
This muscle flexes the hand.
Palmaris longus
This muscle flexes distal phalanx of thumb
Flexor pollicis longus
The (1)_______ muscle flexes forearm at ridge of humerus elbow joint and rotates forearm to the (2)______position
- Brachioradialis
- midprone
Determine the following muscles described by its action.
- Extends and abducts hand at wrist joint
- Extends fingers and hand
- Extends and adducts hand at wrist joint
A. Extensor digitorum
B. Extensor carpi radialis brevis
C. Extensor carpi radialis longus
D. Extensor carpi ulnaris
E. Extensor digiti minimi
F. A & D
G. B & C
H. A & E
- G
- H
- D
Supination of forearm is performed by the _____ muscle
Supinator
This muscle abducts and extends the thumb
Abductor pollicis longus
Determine the action of the Opponens pollicis
A. Extends metacarpophalangeal joints of thumb
B. Extends metacarpophalangeal joint of index
finger
C. Flexes metacarpophalangeal joint of thumb
D. Pulls thumb medially and forward across palm
E. Extends distal phalanx of thumb
D. Pulls thumb medially and forward across palm
Determine the action of the Extensor pollicis brevis
A. Extends metacarpophalangeal joints of thumb
B. Extends metacarpophalangeal joint of index finger
C. Flexes metacarpophalangeal joint of thumb
D. Pulls thumb medially and forward across palm
E. Extends distal phalanx of thumb
A. Extends metacarpophalangeal joints of thumb
Determine the action of the Extensor pollicis longus
A. Extends metacarpophalangeal joints of thumb
B. Extends metacarpophalangeal joint of index
finger
C. Flexes metacarpophalangeal joint of thumb
D. Pulls thumb medially and forward across palm
E. Extends distal phalanx of thumb
E. Extends distal phalanx of thumb
TRUE OR FALSE. Flexor digitorum profundus flexes proximal phalanx of fingers then assists in flexion of middle and proximal phalanges and wrist
FALSE.
FDP flexes distal phalanx of fingers
These 2 muscles acts to extend and abduct hand at wrist joint
Extensor carpi radialis longus and Extensor carpi radialis brevis
This muscle extends MCP joint of index finger
Extensor indicis
What is the action of the Dorsal interossei?
abduct shafts of metacarpal fingers from center of third finger
TRUE OR FALSE: Abductor digiti minimi solely acts to abduct little finger.
True
Flexor digiti minimi flexes what?
little finger/ pinky finger
Opponens digiti minimi pulls the (1)_____ metacarpal forward as in (2)____ the palm
- fifth
- cupping
This muscle flexes the arm and acts as a weak abductor.
Coracobrachialis
Determine the following actions of the SITS muscles. You may choose 2 or more letters.
- abducts arm and stabilizes shoulder joint
- medially rotates arm and stabilizes shoulder joint
- laterally rotates arm and stabilizes shoulder joint
A. Supraspinatus
B. Infraspinatus
C. Teres minor
D. Subscapularis
- A
- D
- B & C
The trapezius, as a whole, has 3 functions. Its upper fibers (1)_______ the scapula. Its middle fibers (2)______ the scapula. Its lower fibers pull the (3)_______ border of the scapula (4)______.
- elevate
- medially pulls
- medial
- downward
This muscle only raises medial border of scapula
Levator Scapulae
The latissimus dorsi has 3 functions. What are they?
- extends the arm
- adducts the arm
- medially rotates the arm
These 2 muscles raises medial border of scapula
upward and medially
Rhomboid Major and Rhomboid Minor
The deltoid acts to (1)_____ the arm. However, its anterior fibers aid in (2)_____ and (3)____ of the arm, while its posterior fiber aid in (4)_____ and (5)______ of the arm.
- abduct
- flexion
- medial rotation
- extension
- lateral rotation
Enumerate the function of the triceps brachii
extensor of elbow joint
Determine the function of the Serratus anterior
A. depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
B. medially rotates and adducts arm and stabilizes shoulder joint
C. draws the scapula forward around the thoracic wall; rotates scapula
D. depresses the clavicle and steadies this bone during movements of the shoulder girdle
E. adducts arm and rotates it medially; clavicular fibers also flex arm
C. draws the scapula forward around the thoracic wall; rotates scapula
Determine the function of the Subclavius
A. depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
B. medially rotates and adducts arm and stabilizes shoulder joint
C. draws the scapula forward around the thoracic wall; rotates scapula
D. depresses the clavicle and steadies this bone during movements of the shoulder girdle
E. adducts arm and rotates it medially; clavicular fibers also flex arm
D. depresses the clavicle and steadies this bone during movements of the shoulder girdle
Determine the function of the Pectoralis major
A. depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
B. medially rotates and adducts arm and stabilizes shoulder joint
C. draws the scapula forward around the thoracic wall; rotates scapula
D. depresses the clavicle and steadies this bone during movements of the shoulder girdle
E. adducts arm and rotates it medially; clavicular fibers also flex arm
E. adducts arm and rotates it medially; clavicular fibers also flex arm
Determine the function of the Pectoralis minor
A. depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
B. medially rotates and adducts arm and stabilizes shoulder joint
C. draws the scapula forward around the thoracic wall; rotates scapula
D. depresses the clavicle and steadies this bone during movements of the shoulder girdle
E. adducts arm and rotates it medially; clavicular fibers also flex arm
A. depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
This muscle medially rotates and adducts arm and
stabilizes shoulder joint.
NOTE: It is not part of the SITS muscle
Teres major
This muscle is a supinator of forearm and flexor of elbow joint. It may also act as a weak flexor of shoulder joint.
Biceps brachii
