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Flashcards in The Gluteal Region Deck (16):
0

What does the gluteus maximus do?

How is it innervated?

Extends the thigh and assists in lateral rotation
It steadies the thigh and assists in rising from the sitting position

Inferior gluteal nerve (L5-S2)

1

What does the gluteus medius do?

How is it innervated?

Abducts and medially rotates the thigh
Keeps the pelvis level when the ipsilateral limb is weight-bearing

Superior gluteal nerve (L5,S1)

2

What does the gluteus minimus do?

How is it innervated?

Abducts and medially rotates the thigh
Keeps the pelvis level when the ipsilateral limb is weight-bearing

Superior gluteal nerve (L5,S1)

3

What does the tensor fasciae latae do?

Abducts and medially rotates the thigh
Keeps the pelvis level when the ipsilateral limb is weight-bearing

Superior gluteal nerve (L5,S1)

4

What does the piriformis do?

How is it innervated?

Lateral rotation of the extended thigh
Abduction of the flexed thigh
Steadies the femoral head in the acetabulum

Nerve to piriformis (S1 and S2)

5

What does the obturator internus do?

How is it innervated?

Laterally rotates the extended thigh
Abducts the flexed thigh
Steadies the head of the femur in the acetabulum

Nerve to obturator internus (L5,S1)

6

What do the superior and inferior gemelli do?

How are they innervated?

Laterally rotate then extended thigh
Abduct the flexed thigh
Steady the head of the femur in the acetabulum

Superior: nerve to obturator internus (L5,S1)
Inferior: nerve to quadratus femoris (L5,S1)

7

What does the quadratus femoris do?

How is it innervated?

Laterally rotates the thigh
Steadies the head of the femur in the acetabulum

Nerve to quadratus femoris (L5,S1)

8

What are the nine muscles of the gluteal region?

Superficial: Gluteus Maximus, Gluteus minimus, Gluteus medius
Tensor fasciae latae
Deep: Piriformis, Obturator internus, Superior gemellus, Inferior gemellus, Quadratus femoris

9

What is the course of the superior gluteal nerve?

Enters the gluteal region via the greater sciatic foramen superior to piriformis
Courses laterally between gluteus medius and gluteus minimus as far as the tensor fasciae latae

10

What is the course of the inferior gluteal nerve?

Enters the gluteal region through the greater sciatic foramen, inferior to piriformis
Runs deep to gluteus maximus
It divides into several branches

11

What happens when there is injury to the superior gluteal nerve?

Motor loss -> paralysis of gluteus minimus and gluteus medius
When a standing person is asked to lift one foot off the ground and stand on one foot, the gluteus medius and gluteus minimus normally contracts as soon as the contralateral foot leaves the floor. This prevents the tipping of the pelvis to the unsupported side. With damage. Pp, the pelvis on the unsupported side descends.

12

What are the nerve roots of the sciatic nerve?

Which two bony landmarks can be used to locate the sciatic nerve?

L4 to S3

Greater trochanter of the femur
Ischial tuberosity

13

What is the course of the sciatic nerve?

Descends from the lumbosacral plexus
Travels through the greater sciatic foramen inferior to piriformis
Descends between the superficial and deep gluteal muscles
At the apex of the popliteal fossa, it bifurcates in to the common fibular and tibial nerves

14

How can we divide the gluteal region into quadrants?

Vertically through the highest point on the iliac crest
The other line passes horizontally through the first line midway between the highest point of the iliac crest and the horizontal plane through the ischial tuberosity. This forms upper and lower, lateral and medial quadrants

15

Which quadrant does the sciatic nerve run through?

Where are intramuscular injections located to avoid damage to the sciatic nerve?

It curves through the lower medial quadrant and descends laterally

Upper lateral quadrant