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LARGE MUSCLES FRONTALIS The frontalis (sometimes also referred to as the "frontal portion") is a thin quadrilateral muscle that is intimately adherent.

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Presentation on theme: "LARGE MUSCLES FRONTALIS The frontalis (sometimes also referred to as the "frontal portion") is a thin quadrilateral muscle that is intimately adherent."— Presentation transcript:

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3 LARGE MUSCLES

4 FRONTALIS The frontalis (sometimes also referred to as the "frontal portion") is a thin quadrilateral muscle that is intimately adherent to the superficial fascia. Origin – Galea aponuerotica (a flat tendon attached to both the frontalis and occipitalis muscles) Insertion – Integument (skin) above the orbits of the eyes. Action – Draws the scalp forward, raises eyebrows, and wrinkles the skin of the forehead horizontally

5 TRAPEZIUS The Trapiezius is a large, superficial muscle at the back of the neck and the upper part of the thorax, or chest. The right and left trapezius together form a trapezium, an irregular four-sided figure. Origin - the occipital bone at the base of the skull, the ligaments on either side of the seven cervical (neck) vertebrae (ligamentum nuchae), and the seventh cervical and all thoracic vertebrae Insertion - the posterior of the clavicle (collarbone) and on the spine of the scapula (shoulder blade)shoulde Action - support of the shoulders and limbs and rotation of the scapula necessary to raise the arms above shoulder level.

6 DELTOID The Deltoid is a large triangular muscle covering the shoulder joint and serving to abduct (take away from) and flex and extend and rotate the arm Origin - from the lateral third of the clavicle, the lateral border of acromion process, and the lower border of spine of scapula Insertion - the side of the shaft of the humerus Action - the abduction, flexion, extension, and rotation of the arm

7 PECTORALIS MAJOR o The pectoralis major is a large, fan-shaped muscle. It covers much of the front upper chest Origin – The sternum (breastbone) including the second to sixth ribs Insertion – The clavicle (collarbone) and converges on the humerus just below the shoulder Action – Moves the arm across the body

8 TRICEPS BRACHII –The large muscle on the back of the human upper limb. It is called a three-headed muscle because there are three bundles of muscle, each of different origin, joining together at the elbow. upper limb –Origin of Long Head: Infraglenoid tubercle of scapula –Origin of Medial Head: Posterior Humerus –Origin of Lateral Head: Posterior Humerus – Insertion – Olecranon process of ULNA –Action – extends forearm, adducts (brings together) shoulder

9 BICEPS BRACHII –The biceps brachii is a muscle located on the upper arm. It has two heads: The Long Head (outer) and the Short Head (inner)musclearm –ORIGIN: Scapula –Supraglenoid Tuberosity [1 ] –Coracoid Process [2 –INSERTION: Radius –Tubercle [1, 2 ] –Fascia of forearm –Bicipital Aponeurosis –ACTION:Rotate the forearm (supination) and Flexion of the Elbow

10 LATISSIMUS DORSI It is the widest and most powerful muscle of the back. It is a large, flat, triangular muscle covering the lower back ORIGIN: the lower half of the vertebral column and iliac crest (hipbone)vertebral column INSERTION: the front of the upper part of the humerus ACTION: draws the upper arm downward and backward and rotates it inward, as exemplified in the downstroke in swimming the crawl. In climbing it joins with the abdominal and pectoral muscles to pull the trunk upward. The two latissimus dorsi muscles also assist in forced respiration by raising the lower ribs.

11 ABDOMINALS The Abdominals are composed of several muscles: the Rectus Abdominus, Transverse Abdominus, and the External and Internal Obliques. Rectus Abdominus muscle is commonly known as the "six-pack" muscle of the abs ACTION: FLEX THE SPINE as in a crunching motion. Transverse Abdominus (also known as the Transversus) is the deepest muscle of the core (meaning it's underneath all the other muscles). It wraps laterally around the abdominal area. ACTION: Acts as a natural weight belt keeping your insides intact External and Internal Obliques run diagonally on the body, allowing for angled movement. ACTION: Work to rotate the torso and stabilize the abdomen

12 GLUTEUS MAXIMUS The gluteus maximus is the uppermost of the three muscles. It is the largest of the gluteal muscles and one of the strongest muscles in the human bodymusclesstrongest muscleshumanbody ORIGIN: Outer surface of ilium behind posterior gluteal line and posterior third of iliac crest lumbar fascia, lateral mass of sacrum, sacrotuberous ligament and coccyx INSERTION: Deepest quarter into gluteal tuberosity of femur, remaining three quarters into iliotibial tract (anterior surface of lateral condyle of tibia) ACTION: Extends and laterally rotates hip. Maintains knee extended via iliotibial tract

13 SARTORIUS A narrow muscle of the thigh, the longest in the human body, that passes obliquely across the front of the thigh and helps rotate the leg to the cross-legged position ORIGIN: superior to the anterior superior iliac spineanterior superior iliac spine INSERTION: anteromedial surface of the upper tibia in the pes anserinustibiapes anserinus ACTION: Flexion of knee, Flexion of Leg

14 BICEPS FEMORIS A muscle of the posterior (the back) thigh. As its name implies, it has two parts, one of which (the long head) forms part of the hamstrings muscle groupthighhamstrings ORIGIN: Long head: upper inner quadrant of posterior surface of ischial tuberosity. Short head: middle third of linea aspera, lateral supracondylar ridge of femur INSERTION: Styloid process of head of fibula. lateral collateral ligament and lateral tibial condyle ACTION: Flexes and laterally rotates knee. Long head extends hip

15 RECTUS FEMORIS Rectus femoris muscle is one of the four quadriceps muscles of the human body. (The others are the vastus medialis, the vastus intermedius (deep to the rectus femoris), and the vastus lateralis. All four combine to form the quadriceps tendonquadriceps muscleshuman bodyvastus medialisvastus intermediusrectus femorisvastus lateralis ORIGIN: Straight head: anterior inferior iliac spine. Reflected head: ilium above acetabulum INSERTION: Quadriceps tendon to patella, via ligamentum patellae into tubercle of tibia ACTION: Extends leg at knee. Flexes thigh at hip

16 GASTROCNEMIUS The gastrocnemius muscle is a very powerful superficial muscle that is in the back part of the lower leg and also called the calf.muscle ORIGIN: Lower posterior surface of the femur above the medial condyle and lateral condyle of the femur INSERTION: Posterior surface of the calcaneus via the achilles tendon ACTION: Plantar flexion Ex: Jumping

17 ACHILLES TENDON The Achilles is the tendonous extension of three muscles in the lower leg: gastrocnemius, soleus, and plantarisplantaris Begins Mid-Calf INSERTION: inserted into the middle part of the posterior surface of the calcaneus ACTION: The primary function of the Achilles tendon is to transmit the power of the calf to the foot enabling walking and running. If it has to do with upright, bipedal motion, the Achilles tendon is a part of that activity.


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