Isolated and Integrated Muscle Functions

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fit-103 assignment.1.2

Anterior Tibialis

front of shin, flexes ankle

Posterior Tibialis

just behind the medial malleoulus or ankle toward the midline of the body

Soleus

a broad flat muscle in the calf of the leg under the gastrocnemius muscle

Gastrocnemius

the muscle in the back part of the leg that forms the greater part of the calf, responsible for the plantar flexion of the foot

Peroneus Longus

Plantar flexion and eversion of foot; stabilizes the lateral ankle and arch of the foot

Biceps Femoris - Long Head

a muscle of the posterior (the back) thigh

Biceps Femoris - Short Head

flexes the leg at the knee, laterally rotates the leg when knee is flexed

Semimebranosus

Under the inner margin of the top of the tibia, flexes leg, extends thigh

Semitendinosus

Flexes leg at the knee and extends thigh at the hip; belongs to the hamstring group

Vastus Lateralis

extends and stabilizes knee

Vastus Medialis

Extends leg at the knee; part of the quadriceps group

Vastus Intermedius

Extends knee. O: Anterior and lateral surfaces of femoral shaft. I: Patella, tibial tuberosity, lateral and medial condyles of tibia.

Rectus Femoris

anterior inferior iliac spine; ilium, quadriceps tendon, extends knee; helps iliopsoas flex thigh at hip

Adductor Longus

Adducts and flexes thigh at the hip; assists in medial rotation

Adductor Magnus - Anterior Fibers

Origin: Posterior fibers: Ischial tuberosity Anterior fibers: Ramus of ischium and pubis Insertion: From a line extending from the gluteal tuberosity along the linea aspera, medial supracondylar line and adductor tubercle on medial condyle of femur. Isolated function: -Assists in concentric acceleration of femoral adduction, flexion and internal rotation. -The adductor magnus assists in concentric acceleration of hip extension. Integrated function: -Assists in dynamic stabilization of the lumbo-pelvic-hip complex during functional movements. -Assists in eccentric deceleration of femoral abduction, extension and external rotation. -The adductor magnus assists in eccentric deceleration of hip flexion.

Adductor Magnus - Posterior Fibers

Origin: Posterior fibers: Ischial tuberosity Anterior fibers: Ramus of ischium and pubis Insertion: From a line extending from the gluteal tuberosity along the linea aspera, medial supracondylar line and adductor tubercle on medial condyle of femur. Isolated function: -Assists in concentric acceleration of femoral adduction, flexion and internal rotation. -The adductor magnus assists in concentric acceleration of hip extension. Integrated function: -Assists in dynamic stabilization of the lumbo-pelvic-hip complex during functional movements. -Assists in eccentric deceleration of femoral abduction, extension and external rotation. -The adductor magnus assists in eccentric deceleration of hip flexion.

Adductor Brevis

originates on ramus of pubis, inserts on lesser trochanter to upper part of linea aspera, adducts thigh at hip, assists in thigh flexion and medial rotation of hip, innervated by obturaror nerve

Gracilis

Adducts thigh at the hip and flexes leg at the knee; assists in medial rotation

Pectineus

originates on superior surface of pubis, inserts on femur, adducts thigh at hip, assists in thigh flexion and medial rotation of hip, innervated by femoral and obturator nerves

Gluteus Medius

the middle of the three gluteal muscles

Gluteus Minimus

the innermost of the three gluteal muscles

Gluteus Maximus

the outermost of the three gluteal muscles, butt.

Tensor Fascia Latae

to tense the fascia lata, flex the hip, and extend the knee

Psoas

either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh

Iliacus

Flexes thigh at the hip

Sartorius

a muscle in the thigh that helps to rotate the leg into the sitting position assumed by a tailor, the longest muscle in the human body.

Piriformis

Abducts and laterally rotates thigh at the hip

Rectus Abdominis

Flexes trunk, Abs

External Oblique

Compresses abdomen; laterally flexes and rotates vertebral column

Internal Oblique

Supports abdominal viscera against pull of gravity; stabilizes vertebral column during heavy lifting; maintains posture; compresses abdominal organs, thus aiding in forceful expiration of contents during childbirth, urination, defecation, and vomiting; unilateral contraction causes ipsilateral rotation of waist.

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