Skeletal Muscular System Flashcards
Frontalis
Raise eyebrows; wrinkle skin on forehead
Occipitalis
Draw scalp posteriorly
Temporalis
Close/elevate mandible
Temporalis (I)
Coronoid process
Orbicularis oculi
Close eye
Orbicularis oris
Close mouth; purse/protrude lips
Zygomaticus major
Smile: draw corner of mouth superior and lateral
Zygomaticus minor
Smile: draw corner of mouth superior and lateral
Risorius
Smirk: draw corner of mouth lateral
Masseter
Closes mandible, elevates mandible
Mentalis
Pout: wrinkle skin on chin, protrude lower lip
Sternocleidomastoid (SCM)
Bilaterally extends neck; unilaterally ipsilaterally flexes and rotates chin to opposite side
Sternocleidomastoid (O)
Sternum (manubrium) & clavicle
Sternocleidomastoid (I)
Mastoid process
Scalenes
Flex neck/cervical spine, elevates first two ribs
Scalenes (O/I of ant and mid)
Attaches to first rib
Scalenes (O/I of post)
Attaches to second rib
Superior rectus
Moves eye superior
Inferior rectus
Moves eye inferior
Lateral rectus
Moves eye lateral
Medial rectus
Moves eye medial
Superior oblique
Depress and medially move the eye
Inferior oblique
Elevate and laterally move the eye
Pectoralis major
Adduction of arm/shoulder, horizontal adduction of arm/shoulder
Pectoralis minor
Protract shoulder
Pectoralis minor (I)
Coracoid process
External intercostals
Elevate the ribs for inhalation
Internal intercostals
Depress the ribs to aid with exhalation
Serratus anterior
Stabilizes shoulder, anterior punch
Diaphragm
Depresses to increase room in thoracic
Rectus abdominis
Flexes trunk
Transverse abdominis
Increases intra-abdominal pressure
Internal oblique
Bilaterally flexes trunk, unilaterally ipsilaterally flexes trunk
External oblique
Bilaterally flexes trunk, unilaterally ipsilaterally flexes trunk
Upper trapezius
Elevates shoulder/scapula
Middle trapezius
Retracts shoulder/scapula
Lower trapezius
Depresses shoulder/scapula
Deltoid
Abduction of arm/shoulder
Deltoid (I)
Deltoid tuberosity
Supraspinatus
Abduction of arm/shoulder, initiates abduction of arm/shoulder
Supraspinatus (O)
Supraspinous fossa
Infraspinatus
Lateral/external rotation of humerus
Infraspinatus (O)
Infraspinous fossa
Infraspinatus (I)
Greater tubercle
Teres major
Internal/medial rotation of humerus
Teres major (I)
Lesser tubercle
Teres minor
External/lateral rotation of humerus
Teres minor (I)
Greater tubercle