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Anatomy 430- ARC Moore
Muscles- Origins, Insertions, and Actions
98
Anatomy
Undergraduate 4
11/08/2012

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Term
Frontalis
Definition
O- epicranial aponeurosis
I- skin of eyebrow, bridge of nose
A- raises eyebrows, wrinkles forehead
Term
Occipitalis
Definition
O- superior nuchal line, adjacent temporal bone
I- epicranial aponeurosis
A- tenses and pulls scalp posteriorly
Term
Temporoparietalis
Definition
O- fascia around the external ear
I- epicranial aponeurosis
A- tenses scalp and moves ear
Term
Orbicularis Oculi
Definition
O- medial margin or orbit
I- skin around eyelids
A- closes eye
Term
Buccinator
Definition
O- molar region of maxilla and mandible
I- Orbicularis oris at angle of mouth
A- compresses cheek and retracts angle of mouth
Term
Zygomaticus Major
Definition
O- zygomatic bone
I- corner of mouth
A- retracts/elevates angle of mouth (smiling)
Term
Zygomaticus Minor
Definition
O- Zygomaticus
I- upper lip
A- elevates upper lip
Term
Depressor Labii Inferioris *
Definition
Depresses lower lip
Term
Levator Labii Superioris *
Definition
elevates upper lip
Term
Mentalis *
Definition
protrudes lower lip
Term
Orbicularis Oris *
Definition
compresses, purses lips
Term
Depressor Anguli Oris *
Definition
depresses angle of the mouth
Term
Risorius *
Definition
draws angle of mouth laterally
Term
Platysma
Definition
O- upper thoracic fascia
I- mandible and corner of mouth
A- tenses skin of neck, depress mandible and lip
Term
Temporalis
Definition
O- temporal bone
I- coronoid process of mandible
A- elevates mandible (closes jaw)
Term
Masseter
Definition
O- zygomatic arch
I- ramus of mandible
A- elevates mandible (close jaw- prime mover)
Term
Pterygoids
Definition
O- pterygoid process
I- madnible (medial ramus)
A- chewing- side to side grinding
Term
Inferior Rectus
Definition
O- sphenoid (around optic canal)
I- inferior surface of eyeball
A- rotate eye down (look down)
Term
Medial Rectus
Definition
O- Sphenoid (around optic canal)
I- medial surface of eye
A- rotate eye medially (adduction)
Term
Superior Rectus
Definition
O- sphenoid
I- superior surface of eye
A- rotate eye up
Term
Inferior Oblique
Definition
O- maxillary bone (of orbit)
I- inferior/lateral surface of eye
A- rotate eye up and laterally
Term
Superior Oblique
Definition
O- Sphenoid
I- superior/lateral surface of eye (via trochlea)
A- rotate eye down and laterally
Term
Lateral Rectus
Definition
O- Sphenoid
I- lateral surface of eye
A- rotate eye laterally (abduction)
Term
Sternocleidomastoid
Definition
O- manubrium, sternal end of clavicle
I- mastoid process (temp b) and superior nuchal line (occip b)
A- laterally flex head (1), rotate head to opposite shoulder (1), flex head/neck (both)
Term
Scalenes
Definition
O- transverse process (cervical)
I- ribs 1 and 2
A- rotate, flex neck / elevates ribs 1 and 2
Term
Splenius (capitus and cervicis)
Definition
O- spin process C7-T6, lig nuchae
I- occiptal bone/ mastoid process
A- rotate, laterally flex neck, together extend neck
Term
Quadratus Lumborum
Definition
O- Iliac Crest
I- transverse process of lumbar vert
A- each laterally flexes spine (vert column)
Term
Erector Spinae Group
(spinalis group, longissiumus group, iliocostalis group)
Definition
O- vertebra, ribs, sacral & iliac crests
I- vertebrae, ribs, and occiptal bone A- extend neck, extend and laterally flex spine
Term
Diaphragm
Definition
O- xiphoid process, costal cartilage, lumbar vertabrae
I- central tendinous sheet
A- breathing (contract to inhale/ relax to exhale). Contraction also compresses abdominal cavity
Term
External Intercostal
Definition
O- inferior border of superior rib
I- superior border of inferior rib
A- elevates ribs to expend ribcage or inspiration
Term
Internal Intercostals
Definition
O- superior border of inferior rib
I- inferior border of superior rib
A- depress ribs/ compress ribcage for expiration
Term
Rectus Abdominis
Definition
O- pubic crest and symphasis
I- costal cart 5-7 and xiphoid process
A- flexes trunk (spine) and compresses abdomen
Term
External Oblique
Definition
O- ribs 5-12
I- linea alba (LA) and iliac crest
A- rotates spine, lateral flexion, and compress abd
Term
Internal Oblique
Definition
O- lumbar fascia (LF), iliac crest
I- ribs 9-12, costal cart, linea alba, pubic crest
A- rotates spine, lateral flexion, compress abd
Term
Transverse Abdominis
Definition
O- Lumbar fascia, costal cart 6-12, and iliac crest
I- linea Alba and pubic crest
A- compresses abdomen
Term
Pectoralis Minor
Definition
O- ribs 3-5
I- coracoid process of scapula
A- abduct and depress scapula, elevates ribs
Term
Serratus Anterior
Definition
O- ribs 1-8
I- medial border of scapula
A- abduct scapula (rotate scapula up)
Term
Levator Scapulae
Definition
O-transverse process (C1-4)
I- medial border of scapula
A- elevates scapula (rotates scapula down)
Term
Rhomboideus Major
Definition
O- spinous process of superior thoracic vert
I- medial border of scapula
A- adduct scapula (rotate scapula down)
Term
Rhomboideus Minor
Definition
O- spinous process of C7 and T1
I- medial border of scapula
A- adduct scapula (rotate scapula down)
Term
Trapezius
Definition
O- occipital bone (ligamentum nuchae), and spinous process of thoracic vertebrae
I- spine and acromion process of scapula, lateral clavicle
A- Upper Fibers= extend neck and elevate scapula
Middle Fibers= adduct scapula
Lower Fibers= depress scapula
Term
Supraspinatus
(rotator cuff muscle)
Definition
o-supraspinus fossa of scapula
I- greater tubercle of humerous
A- weak abduction, stabilize GH joint
Term
Infraspinatus
(rotator cuff muscle)
Definition
O- infraspinus fossa of scapula
I- greater tubercle of humerus
A- laterally rotates arm, stabilize GH joint
Term
Teres Minor
(rotator cuff muscle)
Definition
O- lateral border of scapula
I- greater tubercle of humerous
A- adduct and laterally rotates arm, Stabilize GH joint
Term
Subscapularis
(rotator cuff muscle)
Definition
O- Subscapular fossa of scapula
I- lesser tubercle of humerus
A- medially rotates arm, stabilize GH joint
Term
Pectoralis Major (GH joint)
Definition
O- medial clavicle, sternum, ribs 1-6
I- humerus: intertubercular groove and greater tubercle
A- shoulder (arm) flexion, adduction, horizontal flexion (adduction), Medial rotation
Term
Deltoid (GH joint)
Definition
O- Acromion process, spine of scapula, and clavicle
I- deltoid tuberosity of humerous
A- anterior fibers= flexes shoulder
posterior fibers= extend shoulder
all fibers= shoulder abduction
Term
Latissimus Dorsi (GH joint)
Definition
O- Ribs 8-12, spin. process of T and L vert, thoracolumbar fascia and iliac crest
I- intertubercular groove of humerus
A- shoulder extensionm, adduction, horizontal extension ( horizontal abduction) med rotation
Term
Teres Major (GH joint)
Definition
O- lat border/ inferior angle of scapula
I- interrubercular groove of humerus
A- med rotates, adducts and extends arm (synergist for Latissimus Dorsi)
Term
Coracobrachialis (GH joint)
Definition
O- coracoid process of scapula
I- med surface of humerus
A- adduct, flex shoulder (synergist; pec major)
Term
Triceps Brachii
Definition
O- infraglenoid tubercle and humerus
I- olecranon process of Ulna
A- elbow (forearm)extension (agonist)
Term
Anconeus
Definition
O- Lateral epicondyle of humerus
I- olecranon process of ulna
A- elbow extension (synergist of triceps)
Term
Biceps Brachii
Definition
O- Coracoid process and supraglenoid rubercle of scapula
I- radial tuberosity
A- elbow flexion (agonist) and supinates forearm
Term
Brachialis
Definition
O- distal humerus
I- coronoid process of ulna
A- elbow flexion (synergist of biceps)
Term
Brachioradialis
Definition
O- distal humerus
I- styloid process of radius
A- elbow flexion(Synergist of biceps)
Term
Supinator *
Definition
A- supinates forearm
Term
Pronator Quadratus *
Definition
A- pronates forearm
Term
Flexor Carpi Radialis
Definition
O- Medial epicondyle of humerus
I- metacarpals 2 and 3
A- flex and abduct wrist
Term
Palmaris Longus
Definition
O- Medial epicondyle of humerus
I- palmar aponeurosis
A- flex wrist
Term
Flexor Carpi Ulnaris
Definition
O- Medial epicondyle of humerus
I- metacarpal 5 and pisiform
A- flex and adduct wrist
Term
Extensor Carpi Radialis Longus
Definition
O- lateral supracondylar ridge of humerus
I- metacarpal 2
A- extend and abduct wrist
Term
Extensor Carpi Radialis Brevis
Definition
O- Lateral epicondyle of humerus
I- metacarpal 3
A- extend and abduct wrist
Term
Extensor Carpi Ulnaris
Definition
O- lateral epicondyle of humerus
I- metacarpal 5
A- extend and adduct wrist
Term
Abductor Pollicis Longus *
Definition
A- abduct thumb and wrist
Term
Extensor Digitorum *
Definition
Extend fingers and wrist
Term
Extensor Pollicis Longus and brevis *
Definition
A- extend thumb
Term
Flexor Pollicis Longus *
Definition
A- flex thumb
Term
Flexor Digitorum Superficialis *
Definition
A- Flex fingers and wrist
Term
Flexor digitorum profundus *
Definition
A- flex fingers and wrist
Term
Iliacus (Iliopsoas)
Definition
O- Iliac Fossa
I- Lesser trochanter of femur (via iliopsoas tendon)
A- flex hip and lumbar vertebrae (trunk)
Term
Psoas major (Iliopsoas)
Definition
O- T12-L5 transverse processes
I- lesser trochanter of femur (via Iliopsoas tendon)
A- flex hip and lumbar vertebrae
Term
Tensor Fascia Latae
Definition
O- Iliac Crest and ASIS
I- Iliotibial tract (IT)
A- flex, abduct, medially rotate hip (thigh)
Term
Gluteus Minimus and Medius
Definition
O- illium
I- greater trochanter of femur
A- abducts and medially rotates hip
Term
Gluteus Maximus
Definition
O- dorsal ilium, sacrum, coccyx
I- femur (gluteal tuberosity) and IT tract
A- extend, abduct and laterally rotates hip
Term
Adductor Magnus
Definition
O- inferior pubic ramus, ischial tuberosity
I- linea aspera of femur
A- posterior part of magnus extends hip. All adduct, flex and medially rotate hip
Term
Adductor Longus
Definition
O- inferior pubic ramus
I- linea aspera of femur
A- adduct, flex and medially rotate hip
Term
Adductor Brevis
Definition
O- inferior pubic ramus
I- linea aspera of femur
A- adduct, flex and medially rotate hip
Term
Pectineus
Definition
O- superior ramus of pubis
I- proximal femur
A- adduct, flex and medially rotate hip
Term
Gracilis
Definition
O- inferior ramus of pubis
I- medial and proximal tibia
A- adduct hip, flex and medially rotate knee
Term
Piriformis
Definition
O- sacrum
I- greater trochanter of femur
A- abduct and laterally rotate hip, stabiize hip
Term
Sartorius
Definition
O- ASIS
I- medial tibia (near tibial tuberosity)
A- flex knee, flex abduct and laterally rotate hip
Term
Biceps Femoris (hamstrings)
Definition
O- ischial tuberosity and linea aspera
I- fibula head, lateral condyle of tibia
A- flex knee (leg), extend, laterally roatate hip
Term
Semimembranosus (hamstrings)
Definition
O- ischial tuberosity
I- medial condyle of tibia
A- flex knee, extend and medially rotate hip
Term
Semitendinosus
Definition
O- Ischial tuberosity
I- proximal, medial tibia
A- flex knee, extend and medially rotate hip
Term
Rectus Femoris
Definition
O- AIIS
I- tibial tuberosity via quadriceps tendon- patella- patellar ligament
A- extend knee, flex hip
Term
Vastus Intermedius
Definition
O- Femur, distal linea aspera
I- tibial tuberosity via quadriceps ligament-- patella- patellar ligament
A- extend knee
Term
Vastus lateralis
Definition
O- femur, proximal linea aspera
I- tibial tuberosity via quadriceps tendon- patella- patellar ligament
A- extend knee
Term
Vastus Medialis
Definition
O- Linea Aspera
I- tibial tuberosity via quadriceps tendon- patella- patellar ligament
A- extend knee
Term
Gastrocnemius
Definition
O- femoral condyles
I- calcaneous cia calcaneal tendon
A- plantar flex ankle (foot) and flex knee
Term
Soleus
Definition
O- superior tibia and fibula and interosseous membrane (IM)
I- calcaneous via calcaneal tendon
A- plantar flex ankle
Term
Tibialis Posterior
Definition
O- superior tibia and fibula and interosseous membrane (IM)
I- tarsals and matatarsals (under arch)
A- Plantar flex and invert ankle
Term
Tibialis Anterior
Definition
O- lateral condyle and proximal tibia, IM
I- medial cuneiform and metatarsal 1
A- plantar flex and invert ankle
Term
Fibularis Longus (Peroneus)
Definition
O- head and proximal shaft of fibula
I- Medial cuneiform and matatarsal 1
A- plantarflex and evert ankle
Term
Fibularis Brevis (Peroneus)
Definition
O- distal fibula
I- proximal metatarsals 5
A- plantarflex and evert ankle
Term
Flexor Digitorum Longus *
Definition
A- flex toes 2-5, invert and plantar flex ankle
Term
Flexor Hallucis Longus *
Definition
A- flex hallux, plantar flex ankle
Term
Extensor Digitorum Longus *
Definition
A- extend toes 2-5, dorsflex ankle
Term
Extensor Hallucis Longus *
Definition
A- extend hallux, dorsiflex ankle
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