Muscular System

Review

• Parts of a muscle

Review

Review

Types of Contractions

• Isotonic– Concentric-muscle shortens– Eccentric- muscle lengthens

• Isometric- hold in a stationary position

Interactions of Skeletal Muscle

• Prime movers (agonist)- has responsibility for producing movement

• Antagonist- Moves opposite to movement• Synergist - help prime mover• Fixators- Immobilize bone that muscle are

moving around

Naming muscle

• Location- bone or body region associated• Shape- Deltoid (triangle)• Size- Gluteus Maximus (largest)• Direction of muscle fibers- rectus (straight),

oblique (right angles)• Number of origins- biceps, triceps• Location of attachment- sternocleidomastoid• Actions- flexor, extensor

Facial expression

• Frontalis• Platysma• Obicularis Oculi & Oris• Zygomaticus Major &minor• Levator labii superioris• Buccinator

Facial Expressions

• Frontalis and Occipitalis (Epicranius)• Raises head back, wrinkles forehead

Facial Expression

• Platysma- PeeWee Herman muscle

Facial Expression

• Obicularis Oculi– Closes eye

Facial Muscle

• Around the Lips– Makes puckering (kissing muscle)

Facial Expression

• Zygomaticus Major and minorMajor- SmileMinor- sad face

Facial Expression

• Levator labii superioris– Elvis Muscle– Elevates lip

Facial Expression

• Buccinator– Blowing

Muscles of Mastication

• Masseter• Temporalis• Medial pterygoid• Lateral pterygoid

Muscles of Mastication

• Masseter– Elevates mandible (closes mouth)

Muscles of Mastication

• Temporalis– Closes and opens mouth– Side to side movement of mandible

Muscles of Mastication

• Medial pterygoid– Protract mandible, assist in side to side movement

Muscle of Mastication

• Lateral pterygoid– Forward sliding and side to side movement of the

mandible

Movement of Neck

• Sternocleidomastiod- Flexes and laterally rotates head

• Splenis capitis- extends head

Abdominal Wall

• Rectus Abdominis- sectioned (6 pack)• External Oblique- Sit up• Internal Oblique-same as external oblique• Transversus abdominis- compresses

abdominal contents

Abdominal Wall

Shoulder and Back

• Deltoid- flap like a bird• Pectoralis Major- brings arms together• Serratus anterior- brings arms down and

forward• Latissimus dorsi- brings arms down• Trapezius- should shrugs

Shoulder and Back

Upper Extremity

• Triceps Brachii• Brachialis• Biceps Brachii• Brachioradialis

Lower Extremity

• Sartorius- Tailors Muscle• Adductor group- Groin muscles• Quadriceps femoris– Rectus femoris– Vastus lateralis– Vastus medials

Gluteal Muscles

• Gluteus maximus• Gluteus medius• Gluteus minimus

Hamstrings

• Biceps femoris• Semitendinosus• semimembranosus

Calf Muscles

• Gastrocnemius• Soleus• Plantaris