Practical Two Muscles & Actions Flashcards
Orbicularis oculi
Closes eyes
Orbicularis oris
Closes lips
Buccinator
Compresses cheek
Masseter
Prime mover of jaw closure
Platysma
Tenses skin of neck, “shaving muscle”
Sternocleidomastoid
Flexion of neck forwards
Scalenes (Anterior, Middle, and Posterior)
Elevate ribs 1 and 2
Pectoralis major
Prime mover of arm flexion, adducts and medially rotates arm
Serratus anterior
Prime mover to protract and hold scapula against the chest wall, rotates scapula
Deltoid
Prime mover of arm abduction
Pectoralis minor
Draws scapula forward and inferiorly
External intercostals
Pull ribs toward each other for rib elevation
Internal intercostals
Draw ribs together for rib cage depression
Diaphragm
Prime mover of inspiration, flattens during contraction
Rectus abdominis
Flexes/Rotates vertebral column
External oblique
Compresses abdominal wall
Internal oblique
Compresses abdominal wall
Trapezius
Raises, rotates, and adducts scapula
Latissimus dorsi
Prime mover of arm extension, adducts and medially rotates arm
Infraspinitus
Lateral rotation of humerus
Teres minor
Lateral rotation of humerus
Teres major
Extends, medially rotates, and adducts humerus
Supraspinitus
Initiates abduction of humerus
Erector spinae (From most lateral to most medial: Iliocostales, Longissimus, and Spinalis)
Extend and bend vertebral column laterally
Splenius
Extend or hyperextend head
Tricep brachii
Powerful forearm extensor