Position And Actions Of The Facial Muscles
| Muscle Name | Location | Action |
| Frontalis | Forehead | Raises the eyebrows and wrinkles the forehead |
| Corrugator | Between the eyebrows | Draws the eyebrows down and together into a frown |
| Orbicularis oculi | A circular muscle around the eyes | Closes the eye |
| Risorius | A triangular muscle that extends diagonally from the masseter muscle to the corner of the mouth | Draws the corners of the mouth out and up into a smile |
| Buccinator | Inside the cheeks. It is attached to the upper and lower jaws | Compresses the cheeks |
| Zygomaticus (major and minor) | Extends diagonally from the zygomatic to the corners of the mouth | Lifts the corners of the mouth up and back into a smile |
| Procerus | Between the eyebrows on the bridge of the nose | Draws the eyebrows inwards and wrinkles the bridge of the nose |
| Nasalis | Front of the nose and around the nostrils | Opens and closes the nostrils |
| Levator labii | Around the upper lip | Raises and draws back the upper lips and nostrils |
| Levator anguli | Extends from the upper jaw to the corner of the mouth | Elevates the angle of the mouth |
| Depressor labii | Around the lower lip | Pulls down the lower lip to one side |
| Depressor anguli | Extends from the lower jaw to the corner of the mouth | Depresses the angle of the mouth |
| Orbicularis oris | A circular muscle around the mouth | Closes the mouth |
| Triangularis | Extends over the chin from the corner of the lower lip | Draws the corners of the mouth down |
| Masseter | A flattened muscle which extends from the zygomatic arch to the mandible | Raises the jaw to exert pressure when chewing |
| Mentalis | Front of the chin |
Position And Actions Of The Neck Muscles
| Muscle Name | Location | Action |
| Platysma | Sides of the neck and chin | Draws the corners of the mouth down and back |
| Sterno-cleido-mastoid | Lies across each side of the neck. Runs from the sternum to the clavicle and temporal bone | Rotates the head and flexes the neck |
| Occipitalis | The back of the head | Draws the scalp backwards |
| Splenius capitis | A posterior muscle that extends from the spine to the temporal bone and occipital bone | Extends the head and neck |
Position And Actions Of The Shoulder Girdle Muscles
| Muscle Name | Location | Action |
| Pectoralis major | Front of the chest | Moves the arm towards the upper body |
| Deltoid | Covers the shoulder | Takes the arm away from the body in a sideways motion |
| Trapezius | Triangular muscle covering the back of the neck and upper back | Allows the head to move backwards |
| Levator scapula | Runs vertically through the neck | Elevates the scapula |
| Rhomboids | Lies between the scapulae | Adducts the scapula |
| Infraspinatus | Attaches to the middle of the scapula | Rotates the humerus outwardly |
| Teres major | Attaches to the bottom end of the scapula and the back of the humerus | Adducts and inwardly rotates the humerus |
| Teres minor | Attaches to the lateral edge of the scapula | Rotates the humerus outwardly |
Position And Actions Of The Posterior Trunk Muscles
| Muscle Name | Location | Action |
| Erector spinae | Several bands of muscles on either side of the vertebrae | Extends, flexes and rotates the spine |
| Latissimus dorsi | Back of the lower thorax and lumber region | Extends and rotates the humerus |
| Quadratus lumborum | Lower back | Side bending and assists the diaphragm |
| Gluteus maximus | Lower part of back and buttocks | Extends the hip and rotates the thigh |
| Gluteus medius | Lateral part of the buttocks behind the gluteus maximus | Abducts and rotates the thigh |
| Gluteus minimus | Lateral part of the buttocks below the gluteus medius | Abducts and rotates the thigh |
| Piriformis | Posterior pelvis. Attaches to the anterior of the sacrum and the top of the femur | Rotates the hip and abducts the thigh |
| Psoas | Lumbar region of the spine and across the hip | Flexes the hip |
| Iliacus | Crosses the hip. Attaches to the iliac crest and the inside of the top of thefemur | Flexes and rotates the thigh |
Position And Actions Of The Anterior Trunk Muscles
| Muscle Name | Location | Action |
| Pectoralis major | Covers the surface of the upper chest | Adducts and inwardly rotates the arm |
| Pectoralis minor | Beneath pectoralis major. Runs from the ribs to the scapula | Rotates the scapula downwards |
| Serratus anterior | Curved muscle at the sides of the ribcage | Pulls the scapula forward |
| External oblique | Slants down from the lower ribs to the pelvic girdle | Flexes, rotates and bends the trunk |
| Internal oblique | Beneath the external obliques | Flexes, rotates and bends the trunk |
| Rectus abdominis | Attaches to the pubic bone and stretches the length of the abdomen to the sternum | Supports the abdominal organs and flexes the vertebral column and trunk |
| Transversus abdominis | Attaches to the inner surface of the ribs | Supports the abdominal organs |
| Diaphragm | Dome shaped muscle that separates the abdominal cavity from the thoracic cavity | Assists breathing as contraction expands the volume of the thoracic cavity, allowing inspiration. |
| External intercostals | Between the ribs, on the outside | Elevate the ribcage when breathing in |
| Internal intercostals | Between the ribs on the outside | Depresses the ribcage when breathing out |