Muscles of the Upper Extremities Flashcards
coracobrachialis origin
apex of the coracoid process by a common tendon with short head of the biceps
coracobrachialis insertion
medial aspect of middle shaft of the humerus
coracobrachialis innervation
musculocutaneous nerve
deltoid origin: anterior part
anterior surface of the lateral end of the clavicle
deltoid origin: middle part
superior surface of the lateral edge of the acromion
deltoid origin: posterior part
posterior border of the spine of the scapula
deltoid insertion
deltoid tuberosity of the humerus
deltoid innervation
axillary nerve
infraspinatus origin
infraspinatus fossa
infraspinatus insertion
middle facet of the greater tubercle of the humerus
infraspinatus innervation
suprascapular nerve
latissimus dorsi origin
posterior layer of the thoracolumbar fascia, spinous processes & supraspinous ligaments of the lower half of the thoracic vertebrae & all lumber vertebrae, median sacral crest, posterior crest of the ilium, lower four ribs, small area near the inferior angle of the scapula, and muscular interdigitations from the obliquus external abdominis
latissimus dorsi insertion
floor of the intertubercular groove of the humerus
latissimus dorsi innervation
middle subscapular (thoracodorsal) nerve
levator scapula origin
transverse processes of C1-2 & posterior tubercles of transverse processes of C3-4
levator scapula insertion
medial border of the scapula between the superior angle & root of the spine
levator scapula innervation
ventral rami of spinal nerves (C3-4) & the dorsal scapular nerve
pectoralis major origin: clavicular head
anterior margin of the medial one half of the clavicle
pectoralis major origin: sternocostal head
lateral margin of the manubrium & body of the sternum & cartilages of the first six or seven ribs. the costal fibers bled with muscular slips from the obliquus external abdominis
pectoralis insertion
crest of the greater tubercle of the humerus
pectoralis innervation: clavicular head
lateral pectoral nerve
pectoralis innervation: sternoclavicular head
lateral & medial pectoral nerve
pectoralis minor origin
external surfaces of the third through the 5th ribs
pectoralis minor insertion
medial border of the coracoid process
pectoralis minor innervation
medial pectoral nerve
rhomboid major & minor origin
ligamentous nuchae & spinous processes of C7-T5
rhomboid major & minor insertion
medial border of scapula, from the root of the spine to the inferior angle
rhomboid major & minor innervation
dorsal scapular nerve
serratus anterior origin
external surface of the lateral region of the 1st to 9th ribs
serratus anterior insertion
entire medial border of the scapula, with a concentration of fibers near the inferior angle
serratus anterior innervation
long thoracic nerve
subclavius origin
near the cartilage of the 1st rib
subclavius insertion
inferior surface of the middle aspect of the clavicle
subclavius innervation
branch from the upper trunk of the brachial plexus (C5-6)
subscapularis origin
subscapular fossa
subscapularis insertion
lesser tubercle of the humerus
subscapular innervation
upper & lower subscapular nerves
supraspinatus origin
suprapsinatus fossa
supraspinatus insertion
upper facet of the greater tubercle of the humerus
supraspinatus innervation
suprascapular nerve
teres major origin
inferior anlge of the scapula
teres major insertion
crest of the lesser tubercle of hte humerus
teres major innervation
lower subscapular nerve
teres minor origin
posterior surface of the lateral border of the scapula
teres minor insertion
lower facet of the greater tubercle of the humerus
teres minor innervation
axillary nerve
trapezius origin
medial part of superior nuchal line & external occipital protuberance, ligamentum nuchae, spinous processes & supraspinous ligaments of the 7th cervical vertebrae & all thoracic vertebrae
trapezius insertion: upper part
posterior-superior edge of the lateral 1/3 of the clavicle
trapezius insertion: middle part
medial margin of the acromion & upper lip of the spine of the scapula
trapezius insertion: lower part
medial end of the spine of the scapula, just lateral to the root
trapezius innervation
primarily by the spinal accessory nerve (cranial nerve XI); secondary innervation directly from ventral rami of C2-4
anconeus origin
posterior side of the lateral epicondyle of the humerus
anconeus insertion
between the olecranon process & proximal surface of the posterior side of the ulna
anconeus innervation
radial nerve
biceps brachii origin: long head
supraglenoid tubercle of the scapula
biceps brachii origin: short head
apex of the coracoid process of the scapula
biceps brachii insertion
bicipital tuberosity of the radius; also to deep connective tissue within the forearm via the fibrous lacertus
biceps brachii innervation
musculocutaneous nerve
brachialis origin
distal aspect of the anterior surface of the humerus
brachialis insertion
coronoid process & tuberosity on the proximal ulna
brachialis innervation
musculocutaneous nerve (small contribution from the radial nerve)
brachioradialis origin
upper 2/3 of the lateral supracondylar ridge of the humerus
brachioradialis insertion
near styloid process at the distal radius