Major Muscles of the human Body : ACTION, ORIGIN, INSERTION

November 10, 2012 | By | Reply More

Major Muscles of the human Body : ACTION, ORIGIN, INSERTION

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HEAD AND NECK MUSCLES

MUSCLE

ACTION

ORIGIN

INSERTION

Frontalis Draws scalp forward, raises eyebrows, wrinkles forehead Epicranial aponeurosis Skin superior to supraorbital margin
Occipitalis Draws scalp backward Occipital bone and mastoid process Epicranial aponeurosis
Orbicularis Oris Closes and protrudes lip, compresses lips against teeth Muscle fibers around mouth Skin at corner of mouth
Orbicularis Oculi Closes eye Medial wall of orbit Circular path around orbit
Temporalis Elevates and retracts mandible Temporal and frontal bones Coronoid process and ramus of mandible
Masseter Elevates and retract mandible Zygomatic arch Angle and ramus of mandible
Buccinator Blowing and sucking actions, holds cheek against teeth, assists in mastication Alveolar processes of maxilla and mandible Blends into fibers of Orbicularis oris
Sternocleidomastoid Rotation and flexion of head Sternum and clavicle Mastoid process

 

Muscles of the Vertebral Column

MUSCLE

ACTION

ORIGIN

INSERTION

Erector Spinae Extend and Rotate the spine Spinous processes Processes of adjacent vertebrae and ribs
Quadratus Lumborum Together depress ribs, alone laterally flex spine Iliac crest 12th rib and transverse processes of lumbar vertebrae

 

 

 

ABDOMINAL AND THORACIC MUSCLES

MUSCLE

ACTION

ORIGIN

INSERTION

Rectus Abdominis Flexion of spine, compresses abdomen Pubic crest and pubic symphisis Cartilage of ribs 5-7 and xiphoid process
External Oblique Compresses abdomen, rotation, lateral bending Inferior 8 ribs Iliac crest and linea alba
Internal Oblique Iliac crest and lumbodorsal fascia Cartilage of lower 3-4 ribs and linea alba
Transverse Abdominis Compresses abdomen Ribs 6-12, iliac crest, lumbodorsal fascia Linea alba and pubis
Internal Intercostals Depresses ribs on forced exhalation Superior border of rib below Inferior border of rib above
External Intercostals Elevates ribs during inhalation Inferior border of rib above Superior border of rib below
Pectoralis Major Adducts and medially rotates arm Clavicle, sternum, cartilage of ribs 2-6 Greater tubercle, and intertubercular sulcus of humerus
Latissimus Dorsi Extends, adducts, and medially rotates arm at shoulder, draws arm inferiorly and posterior Spinous process T6-L5, inferior 4 ribs, lombodorsal fascia Intertubercular sulcus of humerus
Trapezius Elevates, adducts, depresses, and rotates scapula, extends head Occipital bone, ligamentum nuchae, processes of C7– T12 Clavicle, acromion process, spine of scapula

 

 

ARM AND SHOULDER MUSCLES

MUSCLE

ACTION

ORIGIN

INSERTION

Deltoid Abducts arm, rotates arm Lat. clavicle, acromion, spine of scapula Deltoid tuberosity of humerus
Rotater Cuff MusclesSupraspinatus 

Infraspinatus

 

Teres minor

 

Subscapularis

 

(all stabilize position)Abduction of humerusLateral Rotation of humerus

Lateral Rotation of humerus

Medial Rotation of humerus

Scapula Humerus (near head)
Biceps Brachii Flexion and supination of upper arm Supraglenoid tubercle and coracoid process Radial tuberosity
Triceps Brachii Extension of forearm Infraglenoid tubercle, lateral and posterior humerus, and posterior humerus Olecranon of ulna
Brachioradialis Flexes forearm, supinates and pronates Distal medial and lateral borders of humerus Superior to styloid process of radius
Flexor Carpi Flexes and adducts hand Medial epicondyle of humerus and superior posterior border of ulna Carpals, 5th metacarpal
Extensor Carpi Extends and adducts hand Lateral epicondyle of humerus, posterior border of ulna 5th metacarpal

 

 

HIP and THIGH MUSCLES

MUSCLE

ACTION

ORIGIN

INSERTION

Gluteus Maximus Extends and laterally rotates thigh at hip joint Iliac crest, sacrum, coccyx Gluteal tuberosity
Tensor fasciae latae Flexion/Med Rotation at hip Iliac Crest Iliotibial tract
Rectus FemorisVastus Lateralis

 

Vastus Medialis

 

Vastus Intermedius

Extend leg at knee, flexes thigh at hip Anterior inferior iliac spine Patella via quad tendon and tibial tuberosity via patellar tendon
Extend leg at knee Greater trochanter and linea aspera
Linea aspera
Anterior and lateral surfaces of body of femur
Sartorius Flexes leg at knee, laterally rotates thigh Anterior superior iliac spine Medial surface of body of tibia
Gracilis Adducts and medially rotates thigh at hip, flexes leg at knee Pubis symphisis and pubic arch Medial surface of body of tibia
Hamstrings:Biceps Femoris 

Semitendinosus

 

Semimembranosus

Flexes leg at knee, extends thigh at hip Ischial tuberosity, linea aspera Head of fibula, lateral condyle of tibia
Flexes leg at knee, extends thigh at hip Ischial tuberosity Proximal, medial surface of tibia
Flexes leg at knee, extends thigh at hip Ischial tuberosity Medial condyle of tibia
Iliopsois Group Flexes hip with trunk stabilized Illiac crest and anterior lumbar spine Anterior, superior aspect of femur

 

 

LOWER LEG MUSCLES

MUSCLE

ACTION

ORIGIN

INSERTION

Tibialis Anterior Dorsiflexes and inverts foot Body and lateral condyle of tibia 1st cuniform and 1st metatarsal
Gastrocnemius Plantar flexes foot, flexes leg at knee Lateral and medial condyles of femur Calcaneous via Achilles tendon
Soleus Plantar flexes foot, flexes leg at knee Head of fibula and medial tibia Calcaneous via Achilles tendon

 

 

Category: Anatomy, Medical

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