Muscles of Gluteal Region

Question 1

Gluteus Maximus (Origin-3, Insertion-2, Innervation, Action-3)

Answer 1

Origin:

• Ilium
• Dorsal surface of sacrum & coccyx
• Sacrotuberous ligament

Insertion:

• Most fibers end in IT band
• Some fibers insert on gluteal tuberosity

Innervation: Inferior gluteal nerve

Action:

• Extends thigh
• Assists in lateral rotation
• Assists in rising from sitting position

Question 2

Gluteus Medius (Origin, Insertion, Innervation, Action-3)

Answer 2

Origin: External surface of ilium (between anterior and posterior gluteal lines)

Insertion: Lateral surface of greater trochanter of femur

Innervation: Superior gluteal nerve

Action:

• Abducts thigh
• Medially rotates thigh
• Keeps pelvis level when opposite leg is raised

Question 3

Gluteus Minimus

Answer 3

Origin: External surface of ilium between anterior and inferior gluteal lines

Insertion: Anterior surface of greater trochanter of femur

Innervation: Superior gluteal nerve

Action:

• Abducts thigh
• Medially rotates thigh
• Keeps pelvis level when opposite leg is raised