Muscles

Muscles 700 skeletal muscles For each muscle: Name Location Origin Insertion Movement

Organization of Muscle Fibers Parallel Muscles Fascicles = parallel to long axis of muscle When contracted:

Organization of Muscle Fibers Convergent Muscles Fibers are spread over a large area, but come together at a common site Fibers all pull in separate directions

Organization of Muscle Fibers Pennate Muscles Fascicles form common angle with tendon Unipennate – Bipennate – Multipennate -

Organization of Muscle Fibers Circular Muscles Fibers are concentrically arranged around an opening When muscle contracts –

Muscle Terminology Origin – Insertion – Action – Gastrocnemius

Muscle Terminology Actions 2 methods: Bones affected Joints affected Almost all originate or insert on skeleton 2 methods: Bones affected Joints affected

Muscle Terminology Agonist – contraction is responsible for movement Biceps brachii – Antagonist – Triceps brachii - Synergist – helps agonist Most useful at start of contraction

Muscle Terminology Fascicle Organization Rectus - Tranverse - Oblique – Location Temporalis - Brachialis - Gluteus - Glossus -

Muscle Terminology Relative Position Structural Features Superficialis , externus– Internus, profundus – Extrinsic – Intrinsic – Structural Features Biceps – Triceps – Quadriceps –

Muscle Terminology Shape Length Size Trapezius - Deltoid - Rhomboidus - Orbicularis - Length Longus, teres – Brevis – Size Maximus, major - Minimus, minor -

Muscle Terminology Origin and Insertion Function Association Sacrospinalis – Sternocleidomastoid – Function Extensor/flexor - Supinator - Adductor - Association Sartoris – Buccinator –

Define origin and insertion. Name the origin and insertion of the styloglossus. What action does the flexor carpi ulnaris perform?

Former Canadian Prime Minister Jean Chrétien acquired Bell's palsy in his youth which never resolved

Muscles of the Head Orbicularis oris Orbicularis oculi Location Origin Insertion Movement Orbicularis oculi

Muscles of the Head Buccinator Masseter Location Origin Insertion Movement Masseter

Muscles of the Head Temporalis Zygomaticus major Location Origin Insertion Movement Zygomaticus major

Muscles of the Head Risorius Frontalis Location Origin Insertion Movement Frontalis

Muscles of the Head Platysma Location Origin Insertion Movement

Muscles of the Neck Sternocleidomastoid Hyoid Location Origin Insertion Movement Hyoid

1. Where does the temporalis muscle insert? 2. What movement is the orbicularis oris responsible for? 3. What movement is the orbicularis oculi responsible for? 4. Where does the buccinator originate?

Abdominal Muscles Transversus Abdominis Rectus Abdominis Location Origin Insertion Movement Rectus Abdominis

Abdominal Muscles Internal Oblique External Oblique Location Origin Insertion Movement External Oblique

Ribcage Muscles Internal Intercostals External Intercostals Location Origin Insertion Movement External Intercostals

Ribcage Muscles Diaphragm Location Origin Insertion Movement

Which layer of abdominal muscle is the most internal? What is the movement of the rectus abdominus muscles? What is the origin of the sternocleidomastoid muscle? Which muscle depresses the jaw?

Muscles of the Leg Gluteus Maximus Gluteus Medius Location Origin Insertion Movement Gluteus Medius

Muscles of the Leg Gluteus Minimus Location Origin Insertion Movement

Muscles of the Leg Semimembranosus Semitendinosus Location Origin Insertion Movement Semitendinosus

Muscles of the Leg Biceps femoris Location Origin Insertion Movement

Muscles of the Leg Gracilis Adductor brevis Location Origin Insertion Movement Adductor brevis

Muscles of the Leg Adductor longus Adductor magnus Location Origin Insertion Movement Adductor magnus

Muscles of the Leg Sartorius Rectus femoris Location Origin Insertion Movement Rectus femoris

Muscles of the Leg Vastus lateralis Vastus medialis Location Origin Insertion Movement Vastus medialis

Muscles of the Leg Vastus intermedias Location Origin Insertion Movement

Muscles of the Leg Tibialis anterior Location Origin Insertion Movement 37

Muscles of the Leg Soleus Gastrocnemius Location Origin Insertion Movement Gastrocnemius

Muscles of the Back Trapezius Rhomboids Location Origin Insertion Movement Rhomboids

Muscles of the Back Levator scapulae Pectoralis minor Location Origin Insertion Movement Pectoralis minor

Muscles of the Back Serratus anterior Location Origin Insertion Movement

Muscles Acting on the Shoulder Teres Major Location Origin Insertion Movement Deltoid

Muscles Acting on the Shoulder Pectoralis major Location Origin Insertion Movement Latissimus dorsi

Muscles Acting on the Forearm Biceps brachii Location Origin Insertion Movement Brachialis

Muscles Acting on the Forearm Triceps brachii Location Origin Insertion Movement

Muscles Acting on the Forearm Flexors + palmaris longus Location Origin Insertion Movement Extensors