muscle descriptions

44 terms by trice5808

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O= manubrium of sternum and medial clavicle
I= mastoid process, and occipital bone
A=flexes & laterally rotates head


O= Zygomatic arch
I= Angle of ramus of mandible
A= moves Jaw


O=Manubrium of sternum & medial end of clavicle
I=Lower margin of hyoid
A=Depresses larynx and hyoid


O=Posterior manubrium of sternum
I=Thyroid cartilage
A= Pulls larynx and hyoid downward


O=Lower margin of mandible & mastoid Process
I=Connective tissue of hyoid
A= Opens mouth and depresses mandible


O=Occipital bone C7 and all T vertebrae
I=Acromion & spine and lateral clavicle
A=Shrugging shoulder, adduct, elevate scapula

Levator Scapulae

O=C1-C4 transverse process
I= medial border of Scapula/superior to spine
A=Elevates/Adducts Scapula

Rhomboida Major and Minor

O=Spinous Process C7-T5
I=Medial border scapula
A=Squaring shoulders, Stabilize scapula


O=Embraces trapezius insert points, clavical acrom & spin
I=Deltoid tuberosity of humerus
A=arm abduction

Latissimus Dorsi

O= from T6-L5 and iliac crest
I=Humerous intertubercular sulcus,
A= Arm extension, adduction, medial rotation at shoulder

Teres Major

O=Posterior scapula at inferior angle
I=Crest of lesser tubercle of humerus
A= Extends medially ortates adducts humerus


O=Subscapular fossa of scapula
I=Lesser tubercle of humerus
A=Holds head of humerus in glenoid cavity, medial rotation


O=Supaspinous fossa of scapula
I=Superior aspect of greater tubercle of humerus
A=Abducts arm at shoulder


O=Infraspious fossa of scapula
I=greater tubercle of humerus
A=Rotates humerus laterally

Teres minor

O=Lateral border of dorsal scapula
I=greater tubercle of humerus inferior to Infraspinatus
A= rotates humerus laterally

Pectoralis Major

O=Sternal end of Clavicle cartilage of ribs 1-6
I=Fibers converge to insert on great tubercle of humerus
A=Arm flextion & Medial rotation/adduction of arm

Pectoralis Minor

O=Anterior surface of ribs 3-5
I=Coracoid process of scapula
A=Draws scapula forward and down

Biceps brachii

O=short head-coracoid process
Long head supraglenoid tubercle of scapula
I=Radial tuberosity
A=Flexes elbow, supinates forearm


O=Front of distal humerus
I=Coronoid process of ulna
A=Flexes forearm


O=Lateral supracondylar ridge
I=Base of styloid process of radius
A= Flexes arm at elbow

Triceps brachii

O=Long House-Infraglenoid tubercle of scapula
Lateral head-posterior shaft of humerus
Medial head-posterior humerus
I=Common tendon to olecranon process of ulna
A=Forearm extention

Transversus abdominis

O=Lumbar fascia & cartilages of last 6 ribs
I=Linea alba
A=Compresses abdomen

Internal Obliques

O=Lumbar facia & iliac crest
I=Linea alba, pubic crest & last 3 ribs
A=Flex vertebral column

External oblique

O=Fleshy strips from lower 8ribs
I=Fibers insert into linea alba
A=Flex vertebral column

Rectus abdominis

O=Pubic crest and symphysis
I=Xiphoid process & costal cartilages of ribs 5-7
A=Flex and rotate lumbar region


O=Anterior superior iliac spine of coccyx
I=winds around medial knee and inserts on medial tibia
A=Flexes, abducts leg at knee

Tensor Fasciae Latae

O=Anterior iliac crest
I=Iliotibial tract
A=Steadies the trunk on the thigh


O=Interior border of pubic symphysis
I=Proximal, medial surface of tibia
A=Flex leg at knee


O=Superior ramus of the pubis
I=Posterior femur below lesser trochanter
A=Adducts and flexes thigh

Adductor longus

O=Pubis near pubic symphysis
I=Linea aspera
A=Adducts, flexes thigh

Adductor magnus

O=Ischial & Pubic rami & ischial tuberosity
I=Broad area- linea aspera & supracondylar line of femur
A=anterior portion-adducts, medial rotates thigh
Posterior portion- with hamstring to extend thigh


O=Posterior superior tibia and fibula
I=Posterior calcaneus via calcaneal
A=Plantar flexes foot


O=Medial & lateral condyles of femu
I=Posterior calcaneus via calcaneal tendon
A=Plantar flexes flexes foot

Tibialis anterior

O= Lateral condyle and upper shaft of tibia
I= Inferior surface of 1st metatarsal
A=Dorsiflexion of foot

Vastus Lateralis (quad)

O=Greater trochanter of femur
I=Patella & tibial tuberosity
A=Extends knee

Vastus medialis (quad)

O=Medial suprcondylar line of femur
I=Patella and tibial tuberosity
A=Extends knee

Vastus Intermedius (quad)

O=Anterior/lateral surface of femur
I= tibial tuberosity
A=extends knee

Rectus femoris (quad)

O=Anterior inferior iliac spine above acetabulum
I=Patella and tibial tuberosity
A=Extends knee

Biceps femoris (hamstring)

O=Ischial tuberosity
I=Common tendon for both heads w/ insertion of on head of fibula and lateral condyle of tibia
A=Extends thigh, flexes knee

Semitendinosus (hamstring)

O=Ischial tuberosity
I=Medial upper tibial shaft
A=extends thigh, flexes knee

Semimembranosus (hamstring)

O=Ischial tuberosity
I=Medial condyle of tibia
A=extends thigh, flexes knee

Gluteus maximus

O=Dorsal ilium, sacrum and coccyx
I=Gluteal tuberosity on head of femur
A=Extensor of thigh

Gluteus medius

O=Lateral surface of ilium
I=Lateral of greater trochanter of femur
A=Abducts, medially rotates thigh

Gluteus minimus

O=External surface of ilium
I=Anterior greater trochanter of femur
A=Abducts and medially rotates thigh

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