A&P Muscle Project

superior muscles

Frontalis= raises eyebrows

Frontalis

• insertion= eyebrow
• origin= frontal bone

orbicularis oculi= helps blink and wink

orbicularis oculi

• insertion= frontal bone
• origin= eyelids

obicularis oris= helps "pucker" the lips and close mouth

orbicularis oris

• insertion=lips
• origin= mandible and maxilla

platysma= pulls corner of mouth into a frown

platysma

• insertion= lower lip
• origin= fascia

deltoid= flexes the shoulder

Deltoid

• insertion= humerus
• origin= clavicle and scapula

latissimus dorsi= abducts, extends, and internally rotates the arm

latissimus Dorsi

• insertion= humerus
• origin= the vertebrae

pectoralis major= contributes to flexion and adduction of the arm

pectoralis major

• insertion= humerus
• origin= clavicular head

rectus abdominis= helps flex the lumbar spine

Rectus abdominis

• insertion= ribs, xiphoid process
• origin= pubis

extensor digitorum longus= helps flex the toes

extensor digitorum longus

• insertion= toes
• origin= tibia and fibula

biceps brachii= flexes elbow and abducts shoulder

BIceps brachii

• insertion= radius
• origin= humerus

triceps brachii= extends forearm and shoulder

triceps brachii

• insertion= ulna
• origin= scapula

brachialis= flexes the elbow

brachialis

• insertion= ulna
• origin= humerus

brachioradialis= helps with soupination and flexion of elbow

brachioradialis

• insertion= radius
• origin= humerus

gluteus medius= helps abduct the hip and prevents adduction of hip

Gluteus Medius

• insertion= femur
• origin= under gluteus maximus

gluteus maximus= extension and rotation of the hips

gluteus maximus

• insertion= femur
• origin= sacrum

sternocleidomastoid=rotation of the head and flexion of the neck

sternocleidomastoid

• insertion= occipital bone
• origin= clavicle

biceps femoris= flexes the knee

biceps femoris

• insertion= tibia
• origin= femur

semimembranosus= extension of hip and flexion of knee

semimembranosus

• insertion= tibia
• origin= ishium

gastrocnemius= flexes foot and knee

Gastronemius

• insertion= calcaneus
• origin= femur

vastus lateralis= extends and stabilizes knee

Vastus lateralis

• insertion= patella
• origin= femur

masseter= helps close the mouth

masseter

• insertion= mandible
• origin= maxilla

trapezius= rotation, elevation

trapezius

• insertion= scapula
• origin= vertebrae

external oblique= rotation of toroso

external oblique

• insertion= iliac crest
• origin= ribs

soleus= plantar flexion

Soleus

• insertion= calcaneus
• origin= fibula

tibials anterior= dorsi flexion and inversion of foot

tibialis anterior

• insertion= metatarsals
• origin= tibia

deep muscles

buccinator= helps chew

splenius capitis= to help rotate and flex the head

semispinalis capitis= extends and hyperextends head and neck

levator scapulae= elevates scapula and bends neck laterally

supraspinatus=

rhomboid= elevates scapula

transversus abdominus= compresses the abdomen

serratus anterior= abducts scapula

external intercostals= elevation of ribcage during breathing

internal oblique=