Ch 6

• FACIAL MUSCLES

  • Frontalis
  • Skin of eyebrows
  • Raise eyebrows (surprise); wrinkle forehead

  
  

  Orbicularis oculi

  • Skin/muscle around the eyes
  • Closes eyes, squints, blinks, winks

  
  

  Orbicularis oris

  • Skin & muscle around mouth
  • Closes mouth and protrudes lips

  
  

  Buccinator

  • Orbicularis oris
  • Compresses cheek, chews

  
  

  Zygomaticus

  • Skin and muscle at corner of lips 
  • Raises corners of mouth
• CHEWING MUSCLES

  
  

  Masseter

  • mandible
  • Close jaw/elevate platysma 

  
  

  Temporalis

  • mandible
  • Closes jaw, synergist of masseter
• NECK MUSCLES

  
  

  Platysma

  • Connective tissue, covering of superior chest muscles
  • Tissue around mouth
  • Tenses skin of neck

  
  

  Sternocleidomastoid

  • Sternum & clavicle
  • Mastoid process 
  • Flexes neck; laterally rotates head
• Pectoralis major

  • Proximal humerus
  • Adducts & flexes humerus

  
  

  • External intercostal: Raise rib cage (inhale)
  • Internal intercostal: Depress rib cage (exhale)

  Muscles of the abdominal girdle

  • 1.Rectus abdominis: flexes abdominal girdle
  • 2.&3.External & internal oblique: flexes vertebral column, bends trunk laterally
  • 4.Transversus abdominis: compresses abdominal contents
• Trapezius

  • Extend head (antagonist of sternocleidomastoid), elevate, depressed, adduct, & stabilize scapula

  Latissimus Dorsi

  • Lower spine & iliac crest, Proximal humerus
  • extends/adducts humerus (power stroke- swimming, striking blow)

  Erector Spinae

  • Iliac crests, ribs 3-12, & vertebrae Ribs, thoracic, & cervical vertebrae
  • Prime mover of back extension (erectors) provides resistance that helps control bending at the waist 
• Quadratus lumborum

  • Iliac crest lumbar fascia, upper lumbar vertebrae
  • Lateral spine flexion (forward bending), extension of lumbar spine

  Deltoid

  • Scapular spine & clavicle, Humerus (deltoid tuberosity)
  • Injection site, prime movers of arm abduction