Muscles Flashcards
Sternocleidomastoid origin?
Mastoid process and lateral third of superior nuchal line
Sternocleidomastoid insertion?
manubrium of sternum and medial 1/3 of clavicle
Sternocleidomastoid action?
tilts head toward the shoulder on the same side
Rotates head to the opposite side
Sternocleidomastoid innervation
Spinal part of CN XI and ventral rami of C2/3 (proprioception)
Trapezius origin?
Medial 1/3 of superior nuchal line, external occipital protuberance, ligamentum nuchae, SP C7, all T vertebrae
Trapezius insertion?
lateral 1/3 of clavicle, medial aspect of acromion and spine of scapula
Trapezius action?
Shrug shoulder
Retract/rtn of scapula
Trapezius innervation?
Spinal part CN XI (motor) and br C3/4 (proprioception)
Latissimus dorsi origin?
TL fascia, SP lower T/L, last 4 rib, slip from inf angle of scapula
Latissimus dorsi insertion?
floor of the bicipital groove
Latissimus dorsi innervation?
Dorsal scapular nerve (C5)
Latissimus dorsi action?
elevates scapula
Levator scapulae origin?
Post tub of TVP C1-4
Levator scapulae insertion?
Superior angle to root of spine of scapula
Levator scapulae innervation?
dorsal scapular N (C5)
Levator scapulae action?
elevates scapula
Anterior scalene origin?
Ant tubercles TVP C3-6
Anterior scalene insertion?
Scalene tubercle on sup aspect of 1st rib
Anterior scalene innervation?
Ant rami C4-6
Anterior scalene action?
ipsilateral lateral flexion of neck
Accessory muscle of respiration
Medial scalene origin?
Post tubercles of TVP C-7
Medial scalene insertion?
Upper aspect 1st rib (btw groove for subclavian A and scalene tubercle)
Medial scalene innervation?
And rami C3-7
Medial scalene action?
ipsilateral lateral flexion of neck
Serratus anterior origin?
lateral aspects upper 8 ribs
Serratus anterior insertion?
Medial aspect of inferior surface of scapula
Serratus anterior innervation?
Long thoracic N (C5-7)
Serratus anterior action?
Draws scapula forward and rotates scapula
Deltoid origin?
lateral 1/3 clavicle, lateral aspect of acromion, spine of scapula
Deltoid insertion?
deltoid tubercle of humerus
Deltoid action?
abducts arm 15-90o
Ant fibers - flex/med rtn of arm
Post fibers ext/lat rtn of arm
Deltoid innervation?
axillary N C5-6
Pec major origin?
Sternum, upper 6 costal cartilages, medial 1/2 clavicle
Pec major insertion?
lateral lip bicipital groove
Pec major innervation?
medial and lateral pectoral nerves (C8 and T1, C5-7)
Pec major action?
adducts, flex, med rtn arm
Extends flexed arm
Supraspinatus origin?
Supraspinous fossa of scapula
Supraspinatus insertion?
superior facet of greater tuberosity of humerus
Supraspinatus innervation?
Suprascapular N (C5-6)
Supraspinatus action?
initiates abduction 0-15o
Infraspinatus origin?
infraspinous fossa of scapula
Infraspinatus insertion
middle facet of greater tuberosity of humerus
Infraspinatus innervation?
suprascapular N (C5-6)
Infraspinatus action?
ext rtn humerus
Teres Major origin?
oval depression on lateral aspect of dorsum of scapula above inf angle
Teres Major insertion?
medial lip of bicipital groove