Higher Extremity Muscles Flashcards
Frontalis
O: cranial aponeurosis
I: skin above eyebrows
A: raises eyebrows, causes wrinkles
Masseter
O: zygomatic and maxilla bone
I: mandible
A: closes jaw, retracts mandible
Sternocleidomastoid
O: sternum and clavicle
I: mastoid process
A: flexes cervical spine
Platysma
O: fascia over deltoid & pectoralis major muscles
I: mandible, muscles around mouth and skin of lower face
A: sad face
Pectoralis major
O: clavicle, sternum, costal cartilages 1-6
I: intertubercular groove of humerous
A: abducts & medially rotates humerous, shoulder flexion
Rectus abdominus
O: pubic bone
I: ribs 5-7 & xiphoid process
A: flexes vertebral column
External oblique
O: inferior 8 ribs
I: illiac crest
A: flexes vertebral column
Biceps
O:
LONG HEAD: glenoid cavity
SHORT HEAD: coracoid process
I: radial tuberosity
A: elbow flexion & supination and shoulder flexion
Crosses two joints
Brachialis
O: distal anterior humerous
I: proximal ulna
A: elbow flexion
Deltoid
O:
A fibres: acromion and clavicle
L fibres: acromion
P fibres: spind of scapula
I: deltoid tuberosity
A:
A fibres: shoulder flexion
L fibres: shoulder abduction
P fibres: shoulder extension
Occipitalis
O: occipital bone and mastoid process
I: cranial aponeurosis
A: draws scalp posteriorly
Trapezius
O: occipital bone, C1-7 spinous process, all thoracic vertebrae
I: clavicle, acromion, and spine of scapula
A:
S fibres: elevate scapula
M fibres: scapular retraction
I fibres: depress scapula and rotate upward
Latissimus dorsi
O: spinous process T6-12, lumbar vertebrae, sacrum, ilium, ribs 9-12
I: intertubucular groove humerous
A: extends, adducts and medially rotates shoulder
Erector spinae
O: illiac crest, ribs 3-12 and vertebrae
I: ribs, thoracic and cervical vertebrae
A: extends and laterally flexes spine
Quadratus lumborum
O: illiac crest and lumbar fascia
I: rib 12 and transverse process L1-4
A: fixes 12th rib during breathing, flexes spine
