Can only pull. Origin Insertion Functional groups Prime movers or agonists Antagonists synergists. Naming muscles 1. Location of the muscle. 2. Shape of the muscle. 3. Size of the muscle 4. Direction of muscle fibers. Rectus—straight Transverse– run at right angles to each other
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Prime movers or agonists
1. Location of the muscle.
2. Shape of the muscle.
3. Size of the muscle
4. Direction of muscle fibers.
Transverse– run at right angles to each other
5. Number of origins
6. Location of attachments.
7. ActionThe Muscular System
thorax to base of skull. Turns face from side to side, bends head toward chest, elevates sternum.
cervical and thoracic vertebrae to occipital
rotates head, bends to one side, extends neck.
same as above
extends head, bends head to 1 side, rotates head.Muscles that move the head and vertebral column
Consists of 2 parts connected by the cranial aponeurosis.
I—skin of eyebrows and roof of nose. Raises eyebrows and wrinkles the forehead skin.
Occipitalis—O—occipital and temporal bones
Pulls scalp posteriorly.
O—frontal and maxillary bones and ligaments of the orbit.
I—tissue of the eyelid
Blinking, squinting, draws eyebrows inferiorly.Muscles of Facial Expression
I—Skin and muscle at the corner of the mouth.
Orbicularis Oris—O—maxilla, mandible, and other facial muscles.
I—muscle and skin at angles of the mouth.
Closes lips, kissing, whistling, protrudes lips.
Buccinator---O—molar region of maxilla and mandible
Compresses cheeks, sucking, whistling, chewing.
Platysma—O—fascia of chest.
I—lower margin of mandible; skin and muscle at the corner of the mouth.
Depresses mandible; frowning, tenses the skin of the neck.Muscles of Facial Expression
rotates, raises, pulls scapula medially.
thoracic to scapula
raises and adducts scapula
upper ribs to ventral surface of scapula
pulls scapula anteriorly and downward.
PECTORALIS MINOR-- upper ribs to coracoid process.
pulls scapula forward and downwardMuscles that move the pectoral girdle
flexes and adducts arm
PECTORALIS MAJOR--clavicle, sternum and ribs to groove in humerus
flexes, adducts, and rotates arm.
TERES MAJOR-- scapula to groove in humerus
extends, adducts and rotates arm mediallyMuscles that move the arm
extends, adducts, rotates arm medially, and pulls should down and back.
SUPRASPINATUS-- scapula to humerus
DELTOID--acromion process and clavicle to humerus.
abducts, extends, and flexes the arm.
INFRASPINATUS-- scapula to humerus.
rotates arm medially.
TERES MINOR--scapula to humerus.
Rotates arm laterally.Muscles that Move the Arm
BRACHIALIS--anterior humerus to ulna
flexes forearm at elbow.
BRACHIORADIALIS- distal humerus to radius
TRICEPS BRACHII-- scapula and humerus to ulna.
extends forearm at the elbow.Muscles that move the forearm
I—superior border between ribs
Elevate rib cage; Aids in inspiration
Internal Intercostals—O—Superior border of rib;
I—inferior border of rib
Draw ribs together; depress rib cage; aid in expiration.
Diaphragm—O—inferior, internal surface of rib cage and sternum; costal cartilages and lumbar vertebrae
Prime mover of inspiration. Flattens on contraction.Breathing Muscles
extends the thigh at the hip
GLUTEUS MEDIUS--ilium to femur
abducts and rotates thigh medially.
ADDUCTOR MAGNUS--ischium to femur
adducts, extends and rotates thigh laterally.
GRACILIS--symphysis pubis to tibia
adducts thigh and flexes leg at kneeMuscles that move the thigh
BICEPS FEMORIS-- ischium and femur to fibula and tibia
flexes and rotes the leg laterally. extends the thigh
ischium to tibia.
flexes and rotates leg medially. extends thigh.
SEMIMEMBRANOSUS- ischium to tibia
flexes and rotates leg medially and extends the thigh.
SARTORIUS-- ilium to tibia
flexes leg and thigh, abducts and rotates thigh laterally.Muscles that move the leg
dorsiflexion and inversion of foot.
EXTENSOR DIGITORUM LONGUS--tibia and fibula to phalanges.
extension of toes, dorsiflexion and eversion of foot.
GASTROCNEMIUS- femur to calcaneus
plantar flexion of foot and flexion of leg at the knee.Muscles that move the foot