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Human Muscles
Muscles, Location, Origin, Insertion, Action, Nerve
51
Anatomy
Undergraduate 2
07/21/2010

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Term
Front Belly of Occipitofrontals
Definition
LOC: Frontal Bone
ACT: Wrinkles forehead, moves scalp and eyebrows "Surprise"
NER: Facial nerve
Term
Occipital Belly of Occipitofrontals
Definition
LOC: Occipital Bone
ACT: Retracts the scalp
NER: Facial nerve
Term
Corrugator
Definition
LOC: Supraorbital margin
ACT: Draws eyebrows together "Frown"
NER: Facial nerve
Term
Platysma
Definition
LOC: Lower side of the face and chin
ACT: Draws the angle of the mouth downward, depresses the muscle "Shaving"
NER: Facial nerve
Term
Orbicularis Oculi
Definition
LOC: Around the eye and eyelid
ACT: Closes the eye "Wink"
NER: Facial Nerve
Term
Zygomaticus Major/Minor
Definition
LOC: Inferior to eye and lateral to nasal
ACT: Raises the angle of the mouth "Smile"
NER: Facial nerve
Term
Levator Labii Superioris
Definition
LOC: Lateral to nose and medial to orbicularis oculi
ACT: Raises the upper lip and wing of nose "snear"
NER: Facial
Term
Rosorius
Definition
LOC: Lateral to wing of mouth, it hooks
ACT: Draws angle of mouth laterally "Grin"
NER: Facial nerve
Term
Buccinator
Definition
LOC: Lateral to wing of mouth, runs oblique
ACT: Draws the corner of the mouth laterally, pulls lips against teeth, flattens cheeks, used in mastication and swallowing "Puff and blow"
NER: Facial nerve
Term
Orbicularis Oris
Definition
LOC: Around the mouth
ACT: Closes and purses lips "Pucker"
NER: Facial nerve
Term
Depressor Anguli Oris
Definition
LOC: Lateral to Orbicularis Oris, runs vertically
ACT: Depresses the corner of the mouth, draws the angle of the mouth down and laterally, draws up the skin of the chin and protrudes lip "Grief"
NER: Facial nerve
Term
Mentalis
Definition
LOC: Inferior to orbicularis oris, runs vertically
ACT: Depresses the corner of the mouth, raises and protrudes the lower lip "Pout"
NER: Facial nerve
Term
Temporalis
Definition
LOC: Temporal Bone
ACT: Elevates and retract the mandible, open and close jaw
NER: Trigeminal nerve
Term
Masseter
Definition
LOC: Lateral and posterior to buccinator, runs oblique
ACT: Elevate mandible which closes the jaw
NER: Trigeminal
Term
Lateral Pterygoid
Definition
LOC: Anterior to ear, inferior to Temporalis
ACT: Protrudes the jaw creating a grinding motion with aid of medial pterygoid, only muscle of mastication to participate in mandible depression
NER: Trigeminal nerve
Term
Medial Pterygoid
Definition
LOC: Pterygoid Bone
ACT: Elevates the mandible and moves it laterally, protracts the mandible
NER: Trigeminal nerve
Term
Superior Rectus
Definition
LOC: Posterior to eyeball, superior
ACT: Moves the eyes superiorally and medially
NER: Oculomotor nerve (C3)
Term
Inferior Rectus
Definition
LOC: Posterior to eyeball, inferior
ACT: Moves eyeball inferior and medially
NER: Oculomotor nerve (C3)
Term
Lateral Rectus
Definition
LOC: Posterior and lateral to eyeball
ACT: Moves eye laterally
NER: Abducens nerve (LR6)
Term
Medial Rectus
Definition
LOC: Posterior and medial to eyeball
ACT: Moves eye medially
NER: Oculomotor nerve (C3)
Term
Superior Oblique
Definition
LOC: Posterior to eyeball, hooks through trochlea
ACT: Elevates and turns eye laterally
NER: Trochlear Nerve (SO4)
Term
Inferior Oblique
Definition
LOC: Inferior to eyeball, runs horizontally
ACT: Depresses eye and turns laterally
NER: Oculomotor nerve (C3)
Term
Iliacus
Definition
Origin: Iliac fossa
Inserts: Lesser trochanter of femur
Action: Flexes and rotates thigh laterally, flexes vertebral column
Term
Psoas
Definition
Origin: Transverse processes of all lumbar vertebrae
Inserts: Lesser trochanter of the femur
Action: Flexes and rotates the thigh laterally at the hip, flexes the vertebral column
Term
Sartorius
Definition
Origin: Anterior superior iliac spine
Inserts: Medial surface of the tibia
Action: Flex knee and hip joint, abducts the hip, rotates the thigh laterally, rotates the leg medially at knee
Term
Adductor Longus
Definition
Origin: Pubis
Inserts: Linea aspera of the femur
Action: adduct, flex, and laterally rotate the thigh
Term
Adductor Brevis
Definition
Origin: Inferior ramus of pubis
Inserts: Linea aspera of femur
Action: Adduct, flex, laterally rotate the thigh
Term
Adductor Magnus
Definition
Origin: Inferior ramus of ischium and the pubis
Inserts: Linea aspera and medial epicondyle of the femur
Action: Adduct, flex, laterally rotate thigh
Term
Gracilis
Definition
Origin: Inferior edge of symphysis pubis
Inserts: Proximal medial surface of tibia
Action: Adduct thigh at hip, flex and rotate leg at knee
Term
Pectineus
Definition
Origin: Pectineal line of pubis
Inserts: Distal to lesser trochanter of femur
Action: Adduct and flex thigh
Term
Gluteus Maximus
Definition
Origin: Iliac crest, sacrum, coccyx, aponeuroses of lumbar region
Inserts: Gluteal tuberosity and iliotibial tract
Action: Extends and rotates the thigh laterally
Term
Gluteus Medius
Definition
Origin: Lateral surface of the ilium
Inserts; Greater trochanter
Action: Abduct and rotate thigh medially
Term
Glutues Minimus
Definition
Origin: Lateral surface of the lower half of ilium
Insertion: Greater Trochanter
Action: Abduct thigh, prevents adduction, medially rotates thigh
Term
Tensor Fascia Latae
Definition
Origin: Anterior border of the ilum and the iliac crest
Inserts: Iliotibial tract
Action: Abduct thigh
Term
Biceps Femoris
Definition
Origin: Ischial tuberosity
Origin: Linea aspera of femur
Insertion: Head of fibula and lateral epicondyle of tibia
Action: Flex knee, extend and laterally rotate thigh
Term
Semitendinosous
Definition
Origin: Ischial tuberosity
Inserts: Proximal portion of medial surface of tibia
Action: flex knee, extend and medially rotate thigh
Term
Semimembranosus
Definition
Origin: Ischial tuberosity
Inserts: Poserterior surface of medial tibial condyle
Action Flex knee, extend and medially rotate thigh
Term
Rectus Femoris
Definition
Origin: Anterior superior iliac spine
Inserts: Patella by patellar tendon
Action: Extend leg at knee joint
Two Joint Muscle
Term
Vastus Lateralis
Definition
Origin: Greater trochanter and linea aspera of femur
Inserts: Patella by patellar tendon
Action: Extend leg at knee
Term
Vastus Medialis
Definition
Origin: Medial surface and linea aspera of femur
Inserts: Patella by the patellar tendon
Action: Extend leg at knee
Term
Vastus Intermedius
Definition
Origin: Anterior and lateral surfaces of femur
Inserts: Patella by patellar tendon
Action: Extend leg at knee
Term
Tibialis Anterior
Definition
Origin: Surface and body of tibia
Inserts: First metatarsal bone and first cuneiform
Action: Dorsiflex and invert foot
Term
Extensor Hallucis Longus
Definition
Origin: Anterior surface of fibula and interosseous ligament
Inserts: Distal phalanx of digit 1
Action: dorsiflex foot
Term
Extensor Digitorum Longus
Definition
Origin: Proximolateral surface of tibia and anterior surface of fibula
Inserts: Extensor digits 2-5
Action Extend digits 2-5 and dorsiflex foot
Term
Gastrocnemius
Definition
Origin: Lateral and medial epicondyle at femur
Inserts: Poseterior surface of calcaneus
Action: Plantar flex foot, flex knee joint
Term
Soleus
Definition
Origin: Posterior of fibula and tibia
Inserts: Calcaneus
Action: Plantar flex foot
Term
Tibialis Posterior
Definition
Origin: tibia and fibula and interosseous ligament
Insertion: Distal tendon behind medial malleolus, navicular, cuneiform, cuboid bones, metatarsal bones 2-4
Action: Plantar flex and invert foot
Term
Flexor Hallucis Longus
Definition
Origin: Posterior fibula
Inserts: Distal phalanx of great toe, tendon passes behind medial malleolus
Action: Flex distal phalanx of great toe
Term
Flexor Digitorum Longus
Definition
Origin: Posterior surface of tibia
Inserts: Tendon passes behind medial malleolus, distal phalanges 2-5
Action: Flex joint of distal phalanges of digits 2-5
Term
Peroneous Longus
Definition
Origin: Lateral head of tibia and head and body of fibula
Action: Plantar flex and evert foot
Inserts: First cuneiform and metatarsal 1
Term
Peroneous Brevis
Definition
Origin: Lower aspect of fibula
Inserts: Metatarsal 5
Action: Plantar flex and evert foot
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