Thigh Muscle Videos - Origins, Insertions, and Actions

Posted on 03 Mar 2016 21:16



The videos and information in this article provide an overview of the muscles of upper leg, which is known as the thigh.

This first video presents the muscles of the front part or anterior compartment of the thigh.

Quadriceps and Illiopsoas Muscles Anterior Thigh Muscles Video

Sartorius Muscle

Origin: Anterior superior iliac spine.

Insertion: anterior medial condyle of tibia.

Action: flexion of hip, flexion of knee, external rotation of thigh during, flexion of hip and knee

Rectus Femoris Muscle

The rectus femoris is the only two-joint quadriceps muscle which crosses the knee and hip joint thus being able to both extend the knee and flex the hip.

Origin: anterior inferior iliac spine.

Insertion: superior aspect of patella and patellar tendon to tibial tuberosity.

Action: extension of knee, flexion of hip

Vastus Lateralis Muscle

Origin: intertrochanteric lin, anterior and inferior borders of greater trochanter, gluteal tuberosity,
upper half of linea aspera and lateral intermuscular septum.

Insertion: lateral border of patella and petellar tendon to tibial tuberosity.

Action: extension of knee.

Vastus Medialis Muscle

Origin: entire length of linea aspera and medial condyloid ridge.

Insertion: upper border of patella and patellar tendon to tibial tuberosity.

Action: extension of knee.

Vastus Intermedius Muscle

Origin: upper two-thirds of anterior surface of femur.

Insertion: upper border of patella and patellar tendon to tibial tuberosity.

Action: extension of knee.

Illiacus Muscle

The illiacus and psoas major and minor(below), because of their common function, are collectively referred to as the illiopsoas muscle.

Origin: inner surface illiac fossa of lllium.

Insertion: lesser trochanter of femur.

Action: flexion of hip and lateral rotation of thigh (femur).

Psoas Major Muscle

Origin: lumbar vetebrae 1-5, sides of last thoracic (T12) vetebrae, and intervertebral fibrocartilages and base of sacrum.

Insertion: lesser trochanter of femur.

Action: flexion of hip, external rotation of femur.

Psoas Minor Muscle (not shown in video)

Origin: same as psoas major.

Insertion pectineal line and illiopectineal eminence.

Action: flexion of hip, external rotation of the femur.

The following video covers the muscles of the medial thigh.

Medial Thigh Muscles Video: Gracilis, Pectineus, and Adductors Magnus, Longus and Brevis

Gracilis Muscle

Origin: descending ramus of pubis.

Insertion: anterior medial surface of tibia below the condyle.

Action: adduction of hip, flexion of knee, internal rotation of hip.

Adductor Magnus Muscle

Origin: ramus of pubis and ischium and ischial tuberosity.

Insertion: entire length of linea aspera and adductor tubercle.

Action: adduction of hip external rotation as hip adducts.

Pectineus Muscle

Origin: one inch wide pectineal line in front of pubis just above crest.

Insertion: proximal femur at lesser trochanter down to linea aspera.

Action: adduction of hip, flexion of hip, internal rotation of hip.

Adductor Longus

Origin: anterior pubis just below crest.

Insertion: middle third of linea aspera.

Action: adduction of hip, assists in flexion of hip.

Adductor Brevis Muscle

Origin: front of inferior pubic ramus just below origin of longus.

Insertion: pectineal line of femur and upper half of medial lip of linea aspera.

Action: adduction of hip, external rotation of hip during adduction.

The following video covers the muscles of the posterior, or back part, of the thigh, known as the "hamstrings." These are the biceps femoris, semitendinosus, and semimembranosus muscles.

Biceps Femoris Muscle

The biceps femoris muscle, as its name implies, has two heads, a long head and a short head, which have two different origins but the same insertion.

Origin:

Long head: ischial tuberosity.
Short head: lower half of linea aspera and lateral condyloid ridge of femur.

Insertion: Head of the fibula and lateral condyle of the tibia.

Action: Extension of thight at the hip, flexion of knee, some external rotation of the hip and the knee joint.

Semitendinosus

Origin: ischial tuberosity.

Insertion: Upper anterior medial surface of the tibia.

Action: Extension of thigh at the hip, flexion of knee, some interntal rotation of hip and knee joint.

Semimembranosus

Origin: ischial tuberosity.

Insertion: Posteromedial (posterior-medial) surface of the medial tibial condyle.

Action: Extension of thigh at the hip, flexion of knee, some interntal rotation of hip and knee joint.

This page created 03 Mar 2016 21:16
Last updated 29 Apr 2016 20:57

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