Muscles of the Abdomen & Thigh

Muscles – Abdomen

Muscle

Description

Contraction

External Oblique

Slants down from rib to pelvis.

  • Exhalation

  • Defacation

  • Urination

  • Childbirth

Internal Oblique

  • Deep to external & internal obliques

  • Runs up from pelvis to ribs.

  • Exhalation

  • Defacation

  • Urination

  • Childbirth

Transverse Abdominis

  • Deep to external and internal obliques.

  • Exhalation

  • Defacation

  • Urination

  • Childbirth

Rectus Abdominis

  • (6-pack) 8-pack

  • Connects pubic bone to sternum.

  • Exhalation

  • Defacation

  • Urination

  • Childbirth

Muscles – Thigh

Muscle

Description

Contraction

Psoas Major

  • Connects lumbar to thigh.

  • Connects ilium to femur.

  • Flex thigh.

Iliacus

  • Lies laterally to psoas major.

  • Connects ilium to femur.

  • Flex thigh.

Gluteus Maximus

  • Largest muscle in the body.

  • Connects sacrum and ilium to femur.

  • Extends thigh at hip.

Gluteus Medius

  • Deep to maximus.

  • Abducts and rotates thigh medially.

Gluteus Minimus

  • Deep to medius.

  • Abducts and rotates thigh medially.

Tensor Fascia (Latae)

  • Connects ilium to fascia in the thigh.

  • Abducts and rotates thigh medially.

Adductor Longus

  • Connects pubic bone to femur.

  • Adducts thigh.

  • Rotates thigh laterally.

Adductor Magnus

  • Connects ischium to femur.

  • Adducts thigh.

  • Rotates thigh laterally.

Gracilis

  • Connects pubic bone to tibia.

  • Adducts thigh.

  • Rotates thigh laterally.

  • Flexes leg at the knee.

Muscles – Lower Leg

Muscle

Description

Contraction

Biceps Femoris

  • Hamstrings.

  • Connects the proximal ends of fibula and tibia.

  • Rotates thigh laterally.

Semitendinosus

  • Hamstring.

  • Connects ischium to tibia.

  • Rotates thigh medially.

Semimembranosus

  • Hamstring.

  • Connects ischium to tibia.

  • Rotates thigh medially.

Sartorius

  • Longest muscle that passes obliquely across the thigh.

  • Rotates thigh laterally. (Crossing your leg)

Quadriceps Femoris

  • 4 parts.

  • Vastus lateralis.

  • Vastus medialis

  • Vastus intermedius

  • Rectus Femurus

  • Extends leg at knee.

Muscles – Foot

Muscle

Description

Contraction

Tibialis Anterior

  • Connects surface of tibia to tarsals.

  • Inversion of the foot.

Peroneus Tertius

  • Connects the fibula to lateral side of the foot.

  • Eversion of the foot.

Extensor Digitorum Longus

  • Behind the fibialis anterior.

  • Attaches the femur to toes.

  • Eversion of the foot.

Gastrocnemius

  • Calf muscles

  • Attaches femur to archilled tendon.

  • Plantar flexion.

Soleus

  • Deep to gastrocnemius.

  • Plantar flexion.

Flexor Digitorum Longus

  • Posterior surface of tibia.

  • Attaches to the bottom of foot.

  • Plantar flexion.

  • Flexes toes.

Tibialis Posterior

  • Connects the fibula to the tarsals.

  • Inversion of foot.

Peroneus Longus

  • Connects fibula and fibularis to tarsals.

  • Eversion of foot.

Muscle That Move The Forearm

Muscle

Description

Contraction

Biceps Brachii

  • 2 muscles – Short head and long head.

  • Anterior surface to arm.

  • Flexes arm and rotates hand laterally.

Brachilais (Deep)

[Articulating down into the radius]

  • Deep to bicep.

  • Elbow flexor

  • Bend elbow/flex.

Brachioradialis (Deep)

[Trigger point]

  • Connects humerus to the radius.

  • Elbow flexor

Supinator (Deep)

  • Deep tissue.

  • Origin – Lateral epicondyle.

  • Insertion – Ulna and radius.

  • Rotates arm laterally.

Pronator Teres (Deep)

  • Same as supinator.

  • Rotates arm medially.

Pronator Quadratus (Deep)

  • Distal end of ulna and end of radius.

  • Assists pronator.

Tricpes Brachii

  • Muscle on the back of upper arm and head.

  • Elbow extension.

Muscles That Move the Hand

Muscle

Description

Contraction

Flexor Carpi Radialis (Superficial)

Extends from distal end of the humerus into the hand.

Flexes and abducts the wrist.

Flexor Carpi Ulnaris (Superficial)

Connects humerus and ulna to the carpal and metacarpals.

Flexes and abducts the wrist.

Palmaris Longus (Superficial)

Located beneath f.e radialis and f.c. ulnaris.

Flexes and abducts the wrist.

Flexor Digitorum Profundus (Deep)

Connects ulna to phalanges.

Flexes joints in fingers.

Extensor Carpi Radialis Longus

Extensor Carpi Radialis Brevis

Extensor Carpi Ulnaris

Connects humerus to hand.

Extends the wrist.

Extensor Digitorum

Connects humerus to phalanges.

Extends the fingers.

Muscles of the Pectoral Girdle

Muscle

Description

Contraction

Trapezius

Large triangular muscle in the upper back.

Raises scapula and shoulder.

Rhomboideus Major

Deep in trapezius.

Adducts to scapula. (Brings scapulas together)

Levator (Scapulae)

Runs vertically through neck.

Elevates the scapula.

Serratus Anterior

Located on the side of the chest inferior to the armpits.

Pulls scapula down and thrusts shoulders forward.

Pectoralis Minor

Deep in pectoralis major.

Raises ribs and helps during breathing.

Muscles that Move the Upper Limb

Muscle

Description

Contraction

Coracobrachialis

Extends from the scapula to the humerus.

Flexes and adducts upper arm.

Pectoralis Major

Upper chest.

Pulls arm across chest – adduction.

Teres Major

Connects scapula to humerus.

Extends humerus and adducts arms.

Latissimus Dorsi

Curves from lower back into armpit.

Extends and adducts arms.

Supraspinatus

Located above the spine of scapula.

Abducts upper arms.

Deltoid

Covers the shoulder joint.

Abducts the upper arm extends and extends the humerus and flexes the humerus.

Subscapularis

Covers the anterior surface of scapula.

Rotates the upper arm.

Medially.

Infraspinatus

Inferior to the spine of scapula.

Rotate the arm laterally.

Teres Minor

Connects the scapula to humerus.

Rotates the upper arm laterally.

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