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A&P I muscles

A&P I muscles and functions

QuestionAnswer
Orbicularis Oculi Closes the eyes
Zygomaticus Raises lateral corners of the mouth (smiles)
Orbicularis Oris Closes the mouth
Masseter Closes the jaw & elevates the mandible
Platysma Tension of skin of the neck
Sternocleidomastoid Flexes and laterally rotates the head
Pectoralis Major Adducts arm; medially rotates arm
Pectoralis Minor Draws the scapula foward and downward
Deltoid Arm abduction
Internal intercostals Depresses the rib cage and draws ribs together
External intercostals Elevates the rib cage and draws ribs together
Rectus abdominis Flexes and rotates the lumbar region of the vertebral column
External obliques Flexes the vertebral column and compresses the abdominal wall
Trapezius Stabilizes, raises, retracts and rotates the scapula
Latissimus Dorsi Extends and adducts arm; medially rotates arm at shoulder
Gluteus Maximus Extends the thigh
Triceps brachii Extends the forearm
Biceps brachii Flexes the elbow joint and supinates forearm
Flexor digitorum profundus Flexes the distal interphalangeal joints
Extensor digitorum Finger extension
Sartorius Flexes, abducts and laterally rotates thigh; flexes the knee
Quadriceps femoris Knee extension
Rectus femoris Extends knee and flexes thigh at hip
Vastus lateralis Extends knee and stabilizes knee
Vastus medialis Extends knee
Biceps femoris Extends thigh and flexes knee
Gastrocnemius Plantar flexes foot
Tibialis posterior foot inversion
Created by: jpalao