Superficial gluteal Muscles

Question 1

Main function

Answer 1

external rotators of thigh

Question 2

List the muscles

Answer 2

• Gluteus Maximus
• Gluteus Medius
• Gluteus Minimus
• Tensor Fascia Latae

Question 3

Gluteus Maximus: origin, insertion, innervation, function

Answer 3

Origin: space behind post. gluteal line 
Insertion: 70% - IT tract; 30% gluteal tuberosity 
Innervation: Inferior gluteal n. L5, S1, S2
Function: 
 - stand from sitting
 - stairs + walking 
 - rotate femur externally + abduct 
 - extend + lock knee via IT tract

Question 4

Gluteus Medius: origin, insertion, innervation, function

Answer 4

Origin: between anterior and posterior gluteal lines
Insertion: lateral + elongate facet of greater trochanter
Innervation: Superior gluteal n. L4, L5, S1
Function: main abductor thigh @ hip joint + med rotate thigh

Question 5

Gluteus Minimus: origin, insertion, innervation, function

Answer 5

Origin: between anterior and inferior gluteal lines
Insertion: anterolateral + linear facet of greater trochanter
Innervation: Superior gluteal n. L4, L5, S1
Function: med rotate thigh + abductor thigh

Question 6

Tensor Fascia Latae: origin, insertion, innervation

Answer 6

Origin: between ASIS and iliac tubercle
Insertion: IT tract
Innervation: Superior gluteal n. L4, L5, S1

Question 7

Trendelenburg Sign

Answer 7

weak or paralysed abductors

- damage to sup. gluteal n. due to pelvic fracture or surgery