Muscle Knowledge: SERRATUS ANTERIOR
Origin: Anterior surfaces of the first 8 or 9 ribs.
Insertion: Anterior surface of medial bonder of scapula.
Actions: Abducts scapula and upwardly rotates it while abducting the arm; stabilizes scapula by holding it to chest wall.
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Muscle Knowledge: Splenius Cervicis
Origin: Spinous process of c1-c3.
Insertion: Transverse process of c1-c3.
Actions: Bilateral actions:Extends and hyper-extends head and neck.
Unilateral actions: Laterally flexes and rotates head and neck to same side.
Muscle Knowledge: SPLENIUS CAPITIS
Origin: Inferior half of ligamentum nuchae (C3-cC) and spinus processes of C7-T3 (possibly to T6).
Insertion: Superior nuchal line of occipital bone and mastoid process of temporal bone.
Actions: Bilateral action: Extends head and neck. Unilateral action: Laterally flexes and rotates head and neck to the same side.
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Muscle Knowledge: GASTROCNEMIUS
ORIGIN: Medial Head: Medial condyle of femur and area just above condyle. Lateral head: Lateral condyle of femur and area just above condyle.
INSERTION: Posterior calcaneus via calcaneal tendon.
ACTION: Extends leg at knee; (also plantar flexes foot).
Muscle Knowledge: VASTUS LATERALIS
ORIGIN: Greater trochanter. It also attches to the lateral lip of liniea aspera of femur.
INSERTION: Quadriceps tendon to base of patella and onto tibial tuberosity via patellar ligament.
ACTION: Extends leg at knee; (part of quadriceps group).
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Muscle Knowledge: VASTUS INTERMEDIUS
ORIGIN: Anterior and lateral surfaces of femur.
INSERTION: Quadriceps tendon to base of patella onto tibial tuberosity via the patella ligament.
ACTION: Extends leg at knee; (part of quadiceps group).
Photo Courtesy of DIAKADI Body
Muscle Knowledge:Vastus Medialis
ORIGIN: Intetrochanteric line. It also attaches to the medial lip of linea aspera of femur.
INSERTION: Quadriceps tendon to base of patella onto tibial tuberosity via the patella ligament.
ACTION: Extends leg at knee.
Photo Courtesy of DIAKADI Body
Muscle Knowledge: Sartorius
ORIGIN: Anterior superior iliac spine and the region just below it.
INSERTION: Proximal tibia, medial to tibial tuberosity.
ACTION: Flexes leg at knee.
Photo Courtesy of DIAKADI Body
Biceps Femoris: Long Head
ORIGIN: Ischial tuberosity of os coxa.
INSERTION: Head of fibula and lateral condyle of tibia.
ACTION: Flexes: Leg at knee and laterally rotates let at knee when knee is flexed.
Photo Courtesy of DIAKADI Body
Muscle Knowledge: Psoas
ORIGIN: Bodies and base of transverse processes of L1-L5.
INSERTION: Lesser trochanter of femur.
ACTION: Flexes and laterally rotates thigh at hip; flexes vertebral column (torso).
Photo Courtesy of DIAKADI Body