Exam 1 Muscles Flashcards
anterior sternal end of the clavicle, sternum, ribs 1-6, aponeurosis of the external oblique
Pectoralis major origin
crest of the greater tubercle of the humerus
Pectoralis major insertion
lateral and medial pectoral nerve
Pectoralis major nerve
adducts, flexes, extends (when it is flexed, not backwards extension), and medially rotates arm
Pectoralis major action
rips 3-5 (costochondral junction)
Pectoralis minor origin
coracoid process
Pectoralis minor insertion
medial pectoral
Pectoralis minor nerve
depresses scapula, elevate ribs (stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall)
Pectoralis minor action
1st rib (costochondral junction)
Subclavius origin
inferior acromial end of clavicle
Subclavius insertion
subclavian
Subclavius nerve
flexes clavicle or elevates 1st rib
Subclavius action
ribs 1-8(9)
Serratus anterior origin
deep medial border of the scapula
Serratus anterior insertion
long thoracic
Serratus anterior nerve
rotate and protract scapula (pulls medial border forward), elevate ribs, it is the deepest scapula muscle
Serratus anterior action
occipital protuberance through T12 nuchal ligament
Trapezius origin
superior margin of scapular spine and anterior acromial end of the clavicle
Trapezius insertion
accessory and cervical plexus
Trapezius nerve
rotate scapula, abduct and extend head
Trapezius action
transverse processes C1-4
Levator scapulae origin
superior angle of scapula
Levator scapulae insertion
dorsal scapular
Levator scapulae nerve
elevate scapula
Levator scapulae action
spinous processes C7-T1
Rhomboideus minor origin
medial border of scapula at spine
Rhomboideus minor insertion
dorsal scapular
Rhomboideus minor nerve
retracts and elevates scapula
Rhomboideus minor action
spinous processes T1-4
Rhomboideus major origin
medial border of scapula inferior to spine
Rhomboideus major insertion
dorsal scapular
Rhomboideus major nerve
retracts and rotates scapula
Rhomboideus major action
supraspinous fossa
Supraspinatus origin
greater tubercle of humerus
Supraspinatus insertion
suprascapular
Supraspinatus nerve
abducts arm (reach to back of head)
Supraspinatus action
infraspinous fossa
Infraspinatus origin
greater tubercle of humerus
Infraspinatus insertion
suprascapular
Infraspinatus nerve
extends and laterally rotates arm
Infraspinatus action
middle 1/3 of lateral border of scapula
Teres minor origin
greater tubercle of humerus
Teres minor insertion
axillary
Teres minor nerve
adducts and extends and laterally rotates arm
Teres minor action
subscapular fossa
Subscapularis origin
lesser tubercle of humerus
Subscapularis insertion
subscapular (upper and lower)
Subscapularis nerve
rotates arm medially (toward belly)
Subscapularis action
spinous process of T7-12, L1-5, median ridge of sacrum and iliac crest (overlaps with trapezius T7-12; trapezius is superficial; occasionally originates at inferior scapula)
Latissimus dorsi origin
crest of lesser tubercle of humerus
Latissimus dorsi insertion
thoracodorsal
Latissimus dorsi nerve
adduct, extend, medially rotate arm
Latissimus dorsi action
inferior 1/3 of lateral border of scapula
Teres major origin
crest of lesser tubercle humerus
Teres major insertion
lower subscapular
Teres major nerve
adducts, extends, medially rotates arm
Teres major action
lateral clavicle, acromion process, spine of scapula
Deltoid origin
deltoid tuberosity
Deltoid insertion
axillary
Deltoid nerve
abduct, flex, extend, and rotate arm
Deltoid action
coracoid process
Coracobrachialis origin
mid medial border of humerus
Coracobrachialis insertion
musculocutaneous
Coracobrachialis nerve
adducts and flexes arm
Coracobrachialis action
coracoid process
Coracobrachialis origin
mid medial border of humerus
Coracobrachialis insertion
musculocutaneous
Coracobrachialis nerve
adducts and flexes arm
Coracobrachialis action
long head: supraglenoid tubercles; short head: coracoid process
Biceps brachii origin
radial tuberosity (primary), bicipital aponeurosis (secondary)
Biceps brachii insertion
musculocutaneous
Biceps brachii nerve
flex and supinate forearm; flex and adduct arm
Biceps brachii action
inferior 2/3 of anterior surface of humerus
Brachialis origin
coronoid process of ulna
Brachialis insertion
musculocutaneous
Brachialis nerve
flex forearm
Brachialis action
long head: lateral border of scapula; lateral head: posterior surface of the humerus; medial head: posterior surface of the humerus
Triceps brachii origin
olecranon of ulna
Triceps brachii insertion
radial
Triceps brachii nerve
extend forearm; extend and adduct arm
Triceps brachii action
superior from highest rib to next lowest
External intercostals origin
next lowest rib (each muscle only extends between 2 ribs)
External intercostals insertion
intercostal
External intercostals nerve
elevate ribs during inspiration
External intercostals action
superior from highest rib to next lowest
Internal intercostals origin
next lowest rib (each muscle only extends between 2 ribs
Internal intercostals insertion
depresses ribs during expiration
Internal intercostals function
Xiphoid process and inferior sternum
Transverse thoracics origin
costal cartilage 2-6
Transverse thoracics insertion
intercostal
Transverse thoracics nerve
expiration (narrows the chest)
Transverse thoracics action
part of internal intercostals
Innermost intercostals