Muscle Anatomy

External oblique

Compresses abdomen; laterally flexes and rotates vertebral column

Internal intercostals

Draws the ribs together and depresses rib cage

Internal oblique

Compresses abdomen; laterally flexes and rotates vertebral column

Rectus abdominis

Compresses abdominal cavity and flexes vertebral column

Transversus abdominis

Constricts abdomen and supports abdominal viscera

External intercostals

Elevates the rib cage

Pectoralis minor

Elevates 3rd-5th ribs during forced inspiration

Diaphragm

Flattens on contraction increasing the volume of thorax during inspiration

Transversus abdominis

Constricts abdomen and supports abdominal viscera

External oblique

Compresses abdomen; laterally flexes and rotates vertebral column

Psoas Major

Flexes the hip

Gluteus Maximus

Extends the hip

Rectus Femoris

Flexes the hip

Sartorius

Flexes, abducts, and externally rotates the hip

Gracilis

Adducts the hip; Flexes and internally rotates lower leg

Adductor Longus

Adducts the hip

Tensor Fascia Latae

Abducts, flexes, and internally rotates the hip; Connected to the iliotibial band

Rectus Femoris

Part of quadriceps muscle group; Extends the knee

Vastus Lateralis

Part of quadriceps muscle group; Extends the knee; Located on the lateral side of the thigh

Vastus Medialis

Part of quadriceps muscle group; Extends the knee; Located on the medial side of the thigh

Biceps Femoris

Part of hamstring muscle group; Flexes the knee; Located on the lateral side of the thigh

Semitendinosus

Part of hamstring muscle group; Flexes the knee; Located on the medial side of the thigh

Semimembranosus

Part of hamstring muscle group; Flexes the knee; Located on the medial side of the thigh

Gastrocnemius

Flexes the knee; Also plantar flexes the foot

Soleus

Plantar flexes the foot

Tibialis Anterior

Dorsiflexes and inverts the foot

Masseter

What muscle is #2?

Sternocleidomastoid

What muscle is #3?

Temporalis

What muscle is #5?

Orbicularis oculi

What muscle is #6?

Buccinator

What muscle is #7?

Orbicularis oris

What muscle is #8?

Platysma

What muscle is #9?

Sartorius

Rectus femoris

Vastus lateralis

Vastus medialis

Gracilis

Gluteus maximus

Biceps femoris

Semitendinosus

Semimembranosus

Gastrocnemius

Soleus

Tibialis anterior

Calcaneal tendon

Rectus abdominis

External oblique

Diaphragm

Trapezius

Deltoid

Latissimus dorsi

Pectoralis major

Triceps brachii

Biceps brachii

Brachioradialis

External intercostals

Internal intercostals

Transversus abdominis

Internal oblique

Frontalis

Draws back scalp, wrinkles forehead, raises eyebrows

Orbicularis oculi

Closes eyelids; used in blinking, winking, and squinting

Orbicularis oris

Closes and protrudes lips; used in whistling and forming many letters during speech; the "kissing muscle"

Sternocleidomastoid

Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck

Temporalis

Elevates and retracts mandible; assists in side to side movement of mandible

Trapezius

Elevates, depresses, retracts, and rotates the scapula; rotates the arm

Zygomaticus major

Draws angles of the mouth upward and outward; major muscle used in smiling and laughing

Buccinator

Draws angles of the mouth laterally; compresses cheek; used to create sucking action

Masseter

Elevates mandible when chewing and slightly protracts it

Occipitalis

Draws back scalp, wrinkles forehead

Splenius capitis

Extends and hyperextends the head; Contraction of only one side laterally flexes and rotates the head and neck

Splenius capitis

Extends and hyperextends the head; Contraction of only one side laterally flexes and rotates the head and neck

Temporalis

Elevates and retracts mandible; assists in side to side movement of mandible

Trapezius

Elevates, depresses, retracts, and rotates the scapula; rotates the arm

Frontalis

Draws back scalp, wrinkles forehead, raises eyebrows

Masseter

Elevates mandible when chewing and slightly protracts it

Orbicularis oculi

Closes eyelids; used in blinking, winking, and squinting

Orbicularis oris

Closes and protrudes lips; used in whistling and forming many letters during speech; the "kissing muscle"

Zygomaticus major

Draws angles of the mouth upward and outward; major muscle used in smiling and laughing

Platysma

Draws down the lower lip and angles of the mouth; tenses skin of the neck; helps depress mandible

Sternocleidomastoid

Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck

Zygomaticus major

Draws angles of the mouth upward and outward; major muscle used in smiling and laughing

Biceps brachii

Flexes and supinates forearm

Brachialis

Flexes elbow

Deltoid

Flexes, medially rotates, and abducts arm

Infraspinatus

Laterally rotates shoulder; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

Supraspinatus

Abducts arm; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

Teres minor

Laterally rotates arm; one of the "rotator cuff" muscles

Teres major

Medially rotates and adducts the arm

Triceps brachii

Extends forearm

Biceps brachii

Flexes and supinates forearm

Brachioradialis

Flexes elbow

Triceps brachii

Extends forearm

Trapezius

Elevates, depresses, retracts, and rotates the scapula; rotates the arm

Trapezius

Elevates, depresses, retracts, and rotates the scapula; rotates the arm

Latissimus dorsi

Extends, adducts, and medially rotates the arm; draws the shoulder downward and backward

Pectoralis major

Adducts and medially rotates the arm; flexes and extends humerus

Serratus anterior

Abducts and protracts the scapula

Serratus anterior

Abducts and protracts the scapula

Latissimus dorsi

Extends, adducts, and medially rotates the arm; draws the shoulder downward and backward