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Arm and Forearm
Muscles
96
Medical
Graduate
05/29/2013

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Cards

Term
Brachialis (Origin)
Definition
Lower half of humerus
Term
Brachialis (Insertion)
Definition
Coronoid process of ulna
Term
Brachialis (Action)
Definition
Prime elbow flexor
Term
Brachialis (Innervation)
Definition
musculocutaneous (twig of radial to lateral side)
Term
Biceps brachii (Origin)
Definition
Long head: Supraglenoid tubercle of scapula
Short head: coracoid process of scapula
Term
Biceps brachii (Insertion)
Definition
Radial tuberosity
Term
Biceps brachii (Action)
Definition
Felxion (Synergist) of forearm
Supination of forearm
Flexion of the arm
Stabilizes shoulder joint
Term
Biceps brachii (Innervation)
Definition
Musculocutaneous
Term
Brachioradialis (Origin)
Definition
humerus
Term
Brachioradialis (Insertion)
Definition
Radius (Distal, near styloid)
Term
Brachioradialis (Action)
Definition
Flexion of elbow
synergist with brachialis and biceps brachii
Term
Brachioradialis (Innervation)
Definition
Radial
Term
Coracobrachialis (Origin)
Definition
Scapula (coracoid process)
Term
Coracobrachialis (Insertion)
Definition
Middle of humerus (anteromedial)
Term
Coracobrachialis (Action)
Definition
Flexion and adduction of the arm
Term
Coracobrachialis (Innervation)
Definition
Musclocutaneous
Term
Muscles acting of the elbow
Definition
Brachialis
Biceps brachii
Brachioradialis
Coracobrachialis
Term
Triceps brachii (Origin)
Definition
Long head: infraglenoid tubercle of scapula
Medial head: posterior humerus (below and medial to radial groove)
Lateral head: Posterior humerus (above and lateral to radial groove)
Term
Triceps brachii (Insertion)
Definition
olecranon of ulna
Term
Triceps brachii (Action)
Definition
extends elbow and shoulder (long head) joints
Term
Triceps brachii (Innervation)
Definition
Radial (long head by axillary)
Term
Anconeus (Origin)
Definition
Lateral epicondyle of humerus
Term
Anconeus (Insertion)
Definition
olecranon of ulna laterally
Term
Anconeus (Action)
Definition
Extends elbow (synergist with Triceps brachii)
Term
Anconeus (Innervation)
Definition
radial
Term
Extensors of the Forearm
Definition
Triceps brachii
Anconeus
Term
Pronator teres (Origin)
Definition
medial epicondyle of humerus
Coronoid process of the ulna
Term
Pronator teres (Insertion)
Definition
Shaft of radius
Term
Pronator teres (Action)
Definition
Pronation of forearm (Palm forward to palm back)
Synergist to pronator quadratus
Term
Pronator teres (Innervation)
Definition
Median
Term
Pronator quadratus (Origin)
Definition
Ulna (distal)
Term
Pronator quadratus (Insertion)
Definition
Radius (distal)
Term
Pronator quadratus (Action)
Definition
Agonist for forearm pronation
resists separation of radius and ulna
Term
Pronator quadratus (Innervation)
Definition
Median and Anterior interosseous nerve (roots C8 and T1 with T1 being primary)
Term
Muscles acting on the elbow
Definition
Pronator teres
Pronator quadratus
Term
Supinator (origin)
Definition
humerus
Term
Supinator (Insertion)
Definition
proximal radius
Term
Supinator (Action)
Definition
supinates forearm
Term
Supinator (Innervation)
Definition
posterior interosseous nerve (a continuation of the deep branch of the radial nerve)
Term
Muscles acting on elbow and wrist
Definition
Supinator
Term
Deltoid (innervation)
Definition
axillary nerve
Term
infraspinatus (innervation)
Definition
suprascapular nerve
Term
Latissimus dorsi (innervation)
Definition
thracodorsal nerve
Term
Levator scapulae (innervation)
Definition
C3 and C4; dorsal scapular nerve
Term
Pectoralis major (innervation)
Definition
medial and lateral pectoral nerves
Term
Pectoralis minor (innervation)
Definition
medial pectoral nerve
Term
Rhomboideus minor (innervation)
Definition
dorsal scapular nerve
Term
Rhomboideus major (innervation)
Definition
dorsal scapular nerve
Term
serratus anterior (innervation)
Definition
long thoracic nefve
Term
Subscapularis (innervation)
Definition
upper and lower subscapular nerves
Term
Supraspinatus (innervation)
Definition
suprascapular nerve
Term
Teres major (innervation)
Definition
lower subscapular nerve
Term
Teres minor (innervation)
Definition
axillary nerve
Term
Trapezius (innervation)
Definition
accessory nerve
Term
Deltoid (Origin)
Definition
acromion, spine of scapula
Term
Deltoid (Insertion)
Definition
umerus
Term
Deltoid (Action)
Definition
flexion, externsion, and abduction of humerus
Term
Infraspinatus (Origin)
Definition
Infraspinatous fossa
Term
Infraspinatus (Insertion)
Definition
greater tubercle of humerus
Term
Infraspinatus (Action)
Definition
rotates humerus laterally
prevents upward slippage of humeral head
Term
Latissiums dorsi (Origin)
Definition
vertebrae T5-L5
iliac crest
Term
Latissiums dorsi (insertion)
Definition
humerus
Term
Latissiums dorsi (action)
Definition
adducts humerus
medially rotates humerus
(Back swing of arm, climbing)
Term
Levator scapulae (origin)
Definition
C1-C4
superior angle of scapula
Term
Levator scapulae (insertion)
Definition
superior angle to medial border of scapula
Term
Levator scapulae (action)
Definition
elevates, retracts, rotates scapula
flexes neck laterally
Term
Pectoralis major (origin)
Definition
clavicle
coastal cartilage
Term
Pectoralis major (insertion)
Definition
humerus
Term
Pectoralis major (action)
Definition
flexes, adducts, and medially rotates humerus
(Climbing, hugging)
Term
Pectoralis minor (origin)
Definition
ribs 3-5
Term
Pectoralis minor (insertion)
Definition
coracoid process of scapula
Term
Pectoralis minor (action)
Definition
protracts and depresses scapula
lifts ribs during forced inspiration
Term
Rhomboideus major (origin)
Definition
vertebrae T2-T5
Term
Rhomboideus major (insertion)
Definition
medial border of the scapula
Term
Rhomboideus major (action)
Definition
retracts and fixes scapula
Term
Rhomboideus minor (origin)
Definition
vertebrae C7-T1
Term
Rhomboideus minor (insertion)
Definition
medial border of the scapula
Term
Rhomboideus minor (action)
Definition
retracts and fixes scapula
Term
Serratus anterior (origin)
Definition
ribs 1-9
Term
Serratus anterior (insertion)
Definition
Medial border of scapula (Note from Becca, not Dr. S - goes under scapula)
Term
Serratus anterior (action)
Definition
abducts (or rotates) and depresses scapula
throwing muscles
Prime mover in forward reaching and pushing actions
Term
Subscapularis (origin)
Definition
subscapular fossa
Term
Subscapularis (insertion)
Definition
lesser tubercle of humerus
Term
Subscapularis (action)
Definition
prevents humeral head from sliding upward as arm is abducted
rotates humerus medially
Term
Supraspinatus (origin)
Definition
supraspinous fossa
Term
Supraspinatus (insertion)
Definition
greater tubercle of humerus
Term
Supraspinatus (action)
Definition
aids deltiod in abduction
resists downward slippage of humeral head
Term
Teres major (origin)
Definition
inferior angle of scapula
Term
Teres major (insertion)
Definition
humerus
Term
Teres major (action)
Definition
extends, medially rotates humerus
(arm swinging)
Term
Teres minor (origin)
Definition
scapula
Term
Teres minor (insertion)
Definition
greater tubercle of humerus
Term
Teres minor (action)
Definition
rotates humerus laterally
prevents upward slippage of humeral head
Term
Trapezius (origin)
Definition
spinous processes of C7-T3

(Note from Becca - Also occipital bone, C7-T12)
Term
Trapezius (insertion)
Definition
Acromion and spine of scapula
lateral third of clavicle
Term
Trapezius (action)
Definition
Stabilizes shoulderr during arm movements
elevates and depresses apex of shoulder
acts with other muscles to rotate and retract scapula
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