arm1 vizniak

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Muscle Origin Insertion Action Nerve
deltoidSA AN Deltoid 001 lateral 1/3 of clavicle, acromion & spine of scapula deltoid tuberosity of humerus abduction of arm; flexion & medial rotation (anterior part); extension & lateral rotation (posterior part) axillary nerve (C5, C6)
*Rotator Cuff Muscles (SITS ->supraspinatus, infraspinatus, teres minor & subcapularis)
supraspinatus*SA AN Supraspinatus 001 supraspinous fossa of scapula; muscle fascia greater tubercle of humerus (superior facet) abduction of arm; stabilizes glenohumeral joint suprascapular nerve (C5, C6)
infraspinatus*SA AN Infraspinatus 001 infraspinous fossa; inferior portion of spine of scapula greater tubercle of humerus (middle facet) lateral rotation of arm; stabilizes glenohumeral joint suprascapular nerve (C5, 6)
teres minor* SA AN Teres Minor 001 superior lateral border of scapula greater tubercle of humerus (inferior facet) lateral rotation of arm; stabilizes glenohumeral joint; adduction of arm (weak) axillary nerve (C5, C6)
subscapularis*SA AN Subsapularis subscapular fossa of scapula lesser tubercle of humerus medial rotation of arm; stabilizes glenohumeral joint upper & lower subscapular nerves (C5, C6)
Other shoulder muscles
teres majorSA AN Teres Major 001 inferior, lateral border of scapula medial lip of bicipital groove of humerus (just medial to insertion of latissimus dorsi) medial rotation of arm; adduction of arm; extension of arm from a flexed position; upward scapular rotation lower subscapular nerve (C5, C6, C7)
serratus anteriorTS AN Serratus Anterior ribs 1- 9 (outer surface) costal surface of medial border of scapula protract (abducts) scapula; upward rotation of scapula; stabilizes scapula long thoracic nerve (C5, C6, C7)
latissimus dorsiTS AN Latissimus Dorsi 001 SP T7-L5; thoracolumbar fascia; iliac crest; posterior sacrum, ribs 9-12; inferior angle of scapula (occasionally) medial lip of bicipital groove of humerus adduction, medial rotation & extension of humerus; anterior pelvic tilt, elevation of pelvis; depression of scapula; downward rotation of scapula thoracodorsal nerve (C6, C7, C8)
pectoralis majorTS AN Pectoralis_Major 001 medial 1/2 of clavicle, anterior manubrium & body of sternum, cartilaginous attachments of upper 6 ribs, external abdominal oblique aponeurosis lateral lip of bicipital groove of humerus (crest of the greater tubercle) adduction of arm (at shoulder joint) medial rotation of arm flexion of arm (clavicular portion) horizontal adduction of arm medial & lateral pectoral nerves (C5-T1)
pectoralis minorTS AN Pectoralis_Minior 001 ribs 3-5 (anterior lateral portion) coracoid process of scapula (medial aspect) stabilizes scapula for arm movements depresses & downwardly rotates scapula assists in scapular protraction from a retracted position elevates ribs 3-5 medial pectoral nerve (C8, T1)
subclaviusTS AN Subclavius_Colour 001 1st rib (junction of costocartilage) middle 1/3 of clavicle (inferior surface) assists in stabilization of clavicle depression of clavicle elevation of 1st rib nerve to subclavius (C5, C6)
 
Muscle Origin Insertion Action Nerve
Anterior Arm
coracobrachialisSA AN Coricobrachialis coracoid process of scapula medial shaft of humerus (middle 1/3) flexion & adduction of arm musculocutaneous nerve (C5, C6, C7)
biceps brachiiSA AN Biceps Brachii long head: supraglenoid tubercle & glenohumeral labrum short head: coracoid process of scapula radial tuberosity; bicipital aponeurosis flexion & supination of forearm; flexion of arm at shoulder; stabilization of anterior aspect of shoulder; abduction of arm at shoulder (long head), adduction of arm at shoulder (short head) musculocutaneous nerve (C5, C6)
brachialisSA AN Brachialis 001 anterior distal 1/2 of humerus ulnar tuberosity; coronoid process of ulna elbow flexion (prime mover) musculocutaneous nerve (C5, C6, C7)
Posterior Arm
triceps brachiiSA AN Triceps 001 long head: infraglenoid tubercle & neck of scapula; lateral head: upper half of posterior surface of shaft of humerus (above radial groove) medial (deep) head: posterior shaft of humerus (distal to radial groove) olecranon process of ulna extension of forearm at elbow (prime mover); adduction & extension of arm (long head only) radial nerve (C6, C7, C8)
articularis cubiti deep distal surface of medial head of triceps posterior capsule of elbow joint lifts capsule away from joint radial nerve (C6, C7, C8)
(c)Dr. Nikita Vizniak. All Rights ReservedIn order to use these tables as a learning tool, you will need to have JavaScript enabled.

These muscle tables are often slightly different than those found in the muscle manual and other texts to allow students learning to realize there are subtle differences in anatomical variation and nomenclature ultimate allowing you to be more aware of real life presentation – after 15 years and over 400 cadaver dissections this author is always amazed at the differences found in the human body every time we are in the cadaver lab – all text books and videos are only accurate to a point!

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