Muscles ID/Fxn Review

Skeletal Muscle Function: raises corners of the mouth

• Frontalis
• Orbicularis oculi
• Orbicularis oris
• Zygomaticus

Skeletal Muscle Function: closes eyes, squints, blinks, winks

• Frontalis
• Orbicularis oculi
• Orbicularis oris
• Zygomaticus

Skeletal Muscle Function: closes mouth and protrudes the lips

• Frontalis
• Orbicularis oculi
• Orbicularis oris
• Zygomaticus

Skeletal Muscle Function: raises eyebrows

• Frontalis
• Orbicularis oculi
• Orbicularis oris
• Zygomaticus

What is the function of the masseter?

Skeletal Muscle Function: flex vertebral column; rotate trunk

• Rectus abdominis
• External and internal obliques
• Trapezius
• Pectoralis major

Skeletal Muscle Function: elevates, depresses, adducts, and stabilizes the scapula (aka shrugs the shoulders)

• Rectus abdominis
• External and internal obliques
• Trapezius
• Pectoralis major

Skeletal Muscle Function: flexes vertebral column and compresses abdominal contents (defecation, childbirth, forced breathing)

• Rectus abdominis
• External and internal obliques
• Trapezius
• Pectoralis major

Skeletal Muscle Function: arm abduction

• Brachioradialis
• Deltoid
• Biceps brachii
• Triceps brachii

Skeletal Muscle Function: thigh extension and knee flexion

• Gluteus maximus
• Gluteus medius
• Hamstring group
• Quadriceps group