Exam 2: Muscles of the Upper Limb Flashcards
Trapezius
-elevates and retracts scapula
Rhomboids (major, minor)
-elevate and retract scapula
Levator Scapulae
-elevates scapula
Pectoralis Minor
-protracts and depresses scapula
Serratus Anterior
-protracts and depresses scapula
Pectoralis Major
- flexes and adducts arm/humerus at glenohumeral joint/arm
- originates on axial skeleton
Latissimus Dorsi
- extends and adducts arm at glenohumeral joint/arm
- originates on axial skeleton
Deltoid
- abducts, flexes and extends arm
- originates on scapula
Coracobrachialis
-flexes and adducts arm
Teres Major
-extends and adducts arm
Rotator Cuff Muscles
-provide main support for glenohumeral joint
Subscapularis
- medially rotates arm
- rotator cuff muscle
- wind up for pitch
Supraspinatus
- abducts arm
- rotator cuff muscle
- execute pitch
Infraspinatus
- laterally rotates arm
- rotator cuff muscle
- execute pitch
Teres Minor
- laterally rotates arm, extend arm/shoulder joint
- rotator cuff muscle
- finsih pitch, slow down pitching arm
Anterior Arm Muscles
- flexors of forearm/elbow joint
- biceps brachii
- brachialis
- brachioradialis
Posterior Arm Muscles
- extensors of the forearm/elbow joint
- triceps brachii
- anconeus
Forearm Muscles
-Anterior forearm contains pronator and flexor muscles
Pronators
- pronator teres (more superficial)
- pronator quadratus (deep)
Flexors
- flex wrist MP joints (knuckles) and/or IP joints
- most originate from medial epicondyle of humerus
Flexor Retinaculum
- band of dense irregular connective tissue to hold flexor tendons close to bone.
- space underneath is carpal tunnel
Flexor Carpi Radialis
- flexes wrist and abducts hand
- superficial group
Palmaris Longus
- flexes wrist
- superficial group
Flexor Carpi Ulnaris
- flexes wrist and adducts hand
- superficial group
Flexor Digitorum Superficialis
- flexes wrist and flexes digits 2 through 5 at the MP and PIP joints (MP=metacarpal-phalangeal PIP=proximal interphalangeal)
- does not move DIP joint
- tendons attach to middle phalanges
- intermediate group
Flexor Digitorum Profundus
- flexes wrist and digits 2-5 at the MP, PIP and DIP joints (DIP=distal interphalangeal)
- tendons attach to distal phalanges
- deep group
Flexor Pollicis Longus
- flexes wrist MP joint, IP joint of thumb
- deep group
Supinator
- supinates forearm
- biceps brachi supinates too
Extensors
-extend wrist MP joints and/or IP joints, most originate from lateral epicondyle of humerus
Extensor Retinaculum
- holds tendons down
- keeps them from bowing out
Extensor Carpi Radialis Longus
- extends wrist and abducts hand
- superficial group
Extensor Carpi Radialis Brevis
- extends wrist and abducts hand
- superficial group
Extensor Digitorum
- extends wrist and extends digits 2-5 at MP, PIP, and DIP joints
- superficial group
Extensor Carpi Ulnaris
- extends wrist and adducts hand
- superficial group
Extensor Pollicis Longus
- :extends thumb
- deep group
Extensor Pollicis Brevis
- extends thumb
- deep group
Abductor Pollicis Longus
- abducts thumb
- deep group
Thenar muscles
-move the thumb
Hypothenar muscles
-move little finger
Midpalmar muscles
- move fingers 2-5
- all of these muscles flex the MP joints and extend the PIP/DIP joints
1. Lumbricals: (4) thin, narrow band of muscles
2. Palmar Interossei: (3) also adduct fingers
3. Dorsal Interossei: (4) also abduct fingers
PAD-DAB
Palmer Interossei ADduct, Dorsal Interossei ABduct