Parts of Skeletal Muscles
How many parts do most skeletal muscles have?
1. Belly
2. Origin
3. Insertion
What is another name for the agonist?
Prime mover
Which two facial muscles are responsible for smiling?
1) the zygomaticus major
2) the zygomaticus minor
Major muscle of respiration, contraction expands thoracic cavity during inspiration
Diaphragm
Function of the Brachialis
Flexion of forearm
What is the bulk of the muscle where most fibers are located?
Belly
What is the major muscle that contracts to produce desired movement?
Agonist/Prime mover
Which two muscles move the eyeball upwards and downwards?
Upwards: Superior rectus
Downwards: Inferior rectus
Muscles that elevates ribs, aid in normal and forced inspiration
External Intercostals
Adducts and flexes thigh
Adductor Longus, Adductor Magnus
What is another name for the "belly"?
The gaster
What muscle opposes the action of the agonist?
Antagonist
What muscle is the strongest jaw muscle? (elevates mandible & closes the jaw)
Masseter
Flexes vertebral column and depresses abdomen
Rectus Abdominis
Muscles used for Plantar flexion (extension) of foot
Gastronemius and Soleus
This area does NOT move when the belly contracts
Origin
During flexion of the forearm (at the elbow), what muscle is the antagonist?
Triceps Brachii
What are the functions of the Medial Pterygoid & Lateral Pterygoid muscles?
Medial Pterygoid: Elevates mandible, Closes jaw, Side-to-Side movement
Lateral Pterygoid: Opens jaw, Side-to-Side movement
Function of the Internal Oblique Muscle
Compresses abdomen, depress ribs, flex or bends vertebral column (deep to external oblique)
Name the 4 Quadriceps & function
Quads: Rectus femoris, vastus lateralis, vastus medialis, vastud intermedius
Function: Extension of leg
Part of the muscle that moves and pulls on the bone or the body part it is attached
Insertion
Which two muscles work synergistically to stabilize the flexion of the forearm?
Biceps brachii and brachialis
Muscle that's the synergist of the masseter, elevates mandible, and closes jaw
Temporalis
Function of the Transversus Abdominis Muscle
Compresses abdomen & flexes vertebral column (deepest of abdominal muscles)
Name the Rotator Cuff muscles & function
Muscles: Supraspinatus, Infraspinatus, Teres Major, Subscapularis
Function: Abduction, adduction and rotation of arm