1 / 28

LIF101 Anatomy

LIF101 Anatomy. Lecture 12: Gluteal and Thigh Muscles. Gluteal Muscles. Gluteus maximus largest, most superficial Gluteus medius medium size, under gluteus maximus Gluteus minimus smallest, under gluteus medius. Gluteus Maximus. Originates at sacrum and coccyx

anaya
Download Presentation

LIF101 Anatomy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LIF101Anatomy Lecture 12: Gluteal and Thigh Muscles

  2. Gluteal Muscles • Gluteus maximus • largest, most superficial • Gluteus medius • medium size, under gluteus maximus • Gluteus minimus • smallest, under gluteus medius

  3. Gluteus Maximus • Originates at sacrum and coccyx • Inserts on posterior femur and iliotibial band

  4. Gluteus Maximus • FUNCTION: • Extends thigh backward, rotates it outward

  5. Gluteus Medius • Originates at lateral surface of ilium, under iliac crest • Inserts on greater trochanter of femur

  6. Gluteus Medius • FUNCTION: • Abducts the thigh

  7. Muscles of the Thigh • Three Groups, Three Compartments: • Extensor group (in anterior compartment) • Adductor group (in medial compartment) • Flexor group (in posterior compartment) • Abductor group (in lateral compartment) • Also: • Ilium-to-knee “muscle window”

  8. Ilium-to-Knee Muscle Window • Sartorius • Tensor Fasciae Latae (with iliotibial band) • Proximal meeting of these two muscles creates anatomical landmark (and window.) • Extensor group looks out the window.

  9. Ilium-to-Knee Muscle Window • Sartorius • Origin: A.S.I.S. • Insertion: medial tibia • Rotates thigh inward and outward • Longest muscle in the human body

  10. Ilium-to-Knee Muscle Window • Tensor fasciae latae • Origin: A.S.I.S. • Insertion: iliotibial band on lateral thigh • FUNCTION: • Provides tension for iliotibial band • Also abducts thigh

  11. Extensor Group of Thigh • A.K.A. “quadriceps” • “Looks out” through ilium-to-knee muscle window • Includes: • Rectus femorus • Vastus lateralis • Vastus medialis • Forms suprapatellar bulge Function of thigh extensor group: All muscles above extend leg

  12. Adductor Group of Thigh • A.K.A. “groin muscles” • Pectineus • Adductor longus • Adductor magnus • Gracilis (gracilis = L. slender) FUNCTION: All muscles listed above adduct thigh

  13. Flexor Group of Thigh • On posterior surface of thigh • A.K.A. “hamstrings” • Include (from left to right on right leg): • Semimembranosus • Semitendinosus • Biceps femoris (long and short heads) All above muscles flex leg

  14. Flexor Group of Thigh • Insertion tendons of the two medial muscles form medial wall of popliteal fossa. • Insertion tendon of lateral muscle forms lateral wall of popliteal fossa.

  15. On lateral side of the leg, tendons of iliotibial band and biceps femoris form distinct surface landmarks.

  16. Surface Landmarks of the Thigh • Anterior: • Hollow notch just below A.S.I.S. (formed by?) • Suprapatellar bulge (distal end of vastus medialis ) • Posterior • Popliteal fossa (padded with adipose tissue) • Tendons on either side • Lateral • Iliotibial band (inserts on lateral tibia) • Biceps femoris tendon (inserts on head of fibula)

  17. Assignments • Reading: • Peck, pp. 128 – 137

More Related