Important OIA

Origin of orbicularis oculi

Maxilla, frontal

Insertion of orbicularis oculi

Encircles eye

Action of orbicularis oculi

Closes the eyelids

Origin of orbicularis oris

Maxilla, mandible

Insertion of orbicularis oris

Lips

Action of orbicularis oris

Closes the lips

Origin of risorius

Fascia of masseter

Insertion of risorius

Angle of the mouth

Action of risorius

Draws out the angle of the mouth

Origin of zygomaticus major

Zygomatic bone

Insertion of zygomaticus major

Angle of the mouth

Action of zygomaticus major

Elevates and abducts the upper lip

Origin of zygomaticus minor

zygomatic bone

Insertion of zygomaticus minor

Orbicularis oris of upper lip

Action of zygomaticus minor

Elevates and abducts the upper lip

Origin of masseter

Zygomatic arch

Insertion of masseter

Mandible

Action of masseter

Elevates and protracts mandible

Origin of lateral pterygoid

Sphenoid

Insertion of lateral pterygoid

Mandible

Action of lateral pterygoid

Retracts and depresses mandible

origin of medial pterygoid

Sphenoid, maxilla

Insertion of medial pterygoid

Mandible

Action of medial pterygoid

Protracts and elevates mandible

Origin of internal intercostals

Superior edge of ribs

Insertion of internal intercostals

Inferior edge of next rib above

Action of internal intercostals

Forces expiration, depresses the ribs

Origin of rectus abdominis

Symphysis pubis, pubic crest

Insertion of rectus abdominis

Inferior thoracic cage

Action of rectus abdominis

Flexes the vertebral column, compresses the abdomen

Origin of external abdominal oblique

Ribs

Insertion of external abdominal oblique

Midline of abdomen

Action of external abdominal oblique

Compresses the abdomen, flexes and rotates the vertebral column

Origin of internal abdominal oblique

Pelvis

Insertion of internal abdominal oblique

Midline of abdomen

Action of internal abdominal oblique

Compresses the abdomen, flexes and rotates the vertebral column

Origin of gastrocnemius

Femur

Insertion of gastrocnemius

Calcaneus

Action of gastrocnemius

Plantarflexes floot, flexes leg

Origin of soleus

Tibia, fibula

Insertion of soleus

Calcaneus

Action of soleus

Plantarflexes foot

Origin of flexor digitorum longus

Tibia

Insertion of flexor digitorum longus

Phalanges

Action of flexor digitorum longus

Flexes four lateral toes, plantar flexes and inverts foot

Origin of levator ani

Pubis, ischium

Insertion of levator ani

Sacrum, coccyx

Action of levator ani

Elevates anus, supports the pelvic viscera

Origin of bulbospongiosus in male

Central tendon, median raphe of penis

Origin of bulbospongiosus of female

Central tendon

Insertion of bulbospongiosus male

Dorsal surface and bulb of penis

Insertion of bulbospongiosus of female

Base of clitoris

Action of bulbospongiosus

Constricts urethra, erects penis or clitoris

Origin of ischiocavernosus

Ischial ramus

Insertion of ischiocavernosus

Corpus cavernosum

Action of ischiocavernosus

Compresses base of penis or clitoris

Origin of deep transverse perineal

Ischial ramus

Insertion of deep transverse perineal

Midline connective tissue

Action of deep transverse perineal

Supports pelvic floor

Origin of superficial transverse perineal

Ischial ramus

Insertion of superficial transverse perineal

Central tendon

Action of superficial transverse perineal

Fixes central tendon

Origin of quadriceps femoris

Ilium

Insertion of quadriceps femoris

Tibia

Actions of quadriceps femoris

Extends knee, flexes hip

Muscle of sartorius

Ilium

Insertion of sartorius

Tibia

Action of Sartorius

Flexes hip and knee, laterally rotates thigh

Origin of extensor digitorum longus

Tibia

Insertion of extensor digitorum longus

Phalanges

Action of extensor digitorum longus

Extends the toes

Origin of Extensor hallucis longus

Fibula, interosseus membrane

Insertion of extensor hallucis longus

Distal phalanx of great toe

Action of extensor hallucis longus

Extends great toe, dorsiflexes, inverts foot

Origin of tibialis anterior

Tibia, interosseus membrane

Insertion of tibialis anterior

Tarsal, metatarsal

Action of tibialis anterior

Dorsiflexes, inverts foot