Muscles

Buccinator

Used to suck in your cheeks

Frontalis

Used to form the horizontal frown crease on the forehead

Masseter

Prime mover of jaw closure

Orbicularis oculi

Used in winking

Orbicularis oris

The "kissing" muscle

Sternocleidomastoid

Prime mover of head flexion; a two-headed muscle

Temporalis

Synergist muscle for jaw closure

Zygomaticus

Used in smiling

Deltoid

Prime mover of for shoulder abduction

Diaphragm

Unpaired muscle that acts with the muscles named immediately above to accomplish inspiration

External intercostal

Deep muscles of the thorax that promote the inspiratory phase of breathing

External Oblique

Part of the abdominal girdle; forms the external lateral walls of the abdomen.

Internal Oblique and Transversus abdominus

Two muscle pairs that help form the natural abdominal girdle

Pectoralis Major

Prime mover for shoulder flexion and adduction

Rectus abdominus

The name means "straight muscle of the abdomen

Sternocleidomastoid

Acting alone, each muscle of this pair turns the head toward the opposite shoulder

Trapezius

Muscle that allows you to shrug your shoulders or extend your head

Erector spinae

Prime mover of back extension; a deep composite muscle consisting of three columns

Latismus Dorsi

Muscle that adducts shoulder and causes extension of the shoulder joint.

Quadratus lumborum

Fleshy muscle forming part of the posterior abdominal wall that helps maintain upright posture.

Adductors

Muscle group that allows you to draw your legs to the midline of your body, as when standing at attention

Fibularis Muscle

Muscle group of the lateral leg; plantar flex and evert the foot

Gastrocnemius

toe dancer's" muscle; a two-bellied muscle of the calf

Gluteus Maximus

Used to extend the hip when climbing the stairs

Gluteus medius

Smaller hip muscle commonly used as an injection site.

Iliopsoas

Hip flexor, deep in pelvis; a composite of two muscles

Quadriceps

Muscle group that extends the knees

Sartorius

Straplike muscle that is a weak thigh flexor; the "tailor's muscle

Soleus

A plantar flexor muscle

Tibialis Anterior

Inverts and dorsiflexes the foot

Flexor carpi ulnaris

Wrist flexor that follows the ulna

Extensor Digitorium

Muscle that extends the fingers

Flexor Digitorium superficialis

Muscle that flexes the fingers

Biceps brachii

Muscle that allows you to bend (flex) the elbow

Triceps brachii

Muscle that extends the elbow

Deltoid

Powerful shoulder abductor, used to raise the arm overhead

Endomysium

Thin connective tissue investing each muscle

Epimysium

Connective tissue ensheathing the entire muscle

Fasicle

A discrete bundle of muscle cells

Myofilament

Actin or myosin containing structure

Myofibril

A long, filamentous organelle found within muscle cells that has a banded appearance

Perimysium

Connective tissure surrounding a fasicle

Sarcolemma

Plasma membrane of the muscle cell

sarcomere

Contractile unit of muscle

Tendon

Cordlike extension of connective tissue beyond the muscle, serving to attach it to the bone.