PSIO 201 5th Edition Lecture 25Outline of Last Lecture Muscle Gross Anatomy IIOutline of Current Lecture I. Muscle Gross Anatomy IIII. Thigh MusclesCharacteristic DescriptionDirection of muscle fibersRectus: Fibers run parallel to the midline Transverse: Fibers run perpendicular to the midline Oblique: Fibers run diagonal to the midlineSize Maximus: Largest Minimus: Smallest Longus: LongestLocationNamed for the bone(s) to which the muscle attaches, or region within which the muscle is found.Shape Deltoid: Triangular shape Rhomboid: Diamond shape Trapezius: Trapezoid shapeNumber of origins Biceps: Two origins Triceps: Three origins Quadriceps: Four originsAction Named for the action that the muscle performs.III. ActionCurrent Lecture Muscles that move the thighThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Muscle LocationIliopsoas: Iliacus and Psoas majorMuscles of the anterior hip. The iliacus originates on the ilium and psoas major originates on the lowervertebrae. Both muscles insert on the proximal femur.Tensor fascia lataeMuscle of the lateral hip and thigh that originates on the iliac crest and inserts on the proximal lateral tibia via the iliotibial tract.Gluteus maximusLarge, superficial muscle of the posterior hip that originates on the ilium and sacrum and inserts on thegluteal tuberosity of the femur.Gluteus mediusDeep to the gluteus maximus, the gluteus medius originates on the posterior ilium and inserts on the greater trochanter of the femur.Gluteus minimusDeep to the gluteus medius, the gluteus minimus originates on the posterior ilium and inserts on the greater trochanter of the femur.GracilisMuscle of the medial thigh that originates on the pubis and inserts on the medial surface of the proximal tibia.Adductor magnusA deep adductor muscle that originates on the ischium and pubis and inserts on the linea aspera of the femur.Adductor longus Originates on the pubis and inserts on the linea aspera of the femur. Adductor brevis Originates on the pubis and inserts on the linea aspera of the femur.PSIO 201 Required Handout Department of PhysiologyMuscles that move the leg and footThe structure of the knee joint allows for flexion and extension, while the ankle joint allows for flexion, extension, eversion and inversion.TABLE 10: Muscles that move the legMuscleLocationActionQuadriceps femorisMuscle of the anterior thigh that originates on the anterior ilium and inserts on the Flexes the thigh and extends the leg.Rectus femorisVastus lateralisVastus medialisVastus intermediustibial tuberosity via the patellar ligament.Originates on the proximal femur and inserts on the tibial tuberosity.Originates on the linea aspera of the femur and inserts on the tibial tuberosity.Originates on the anterior and lateral surfaces of the body of the femur and inserts on the tibial tuberosity.Extends the leg.Extends the leg.Extends the leg.SartoriusCalled the “tailor’s muscle”, the sartorius is the longest muscle in the body. It originates on the ilium and inserts on the medial body of the tibia.Flexes the leg, and flexes and laterally rotates the thigh.Hamstrings groupBiceps
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