Gluteal Region and Posterior Thigh Flashcards Preview

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Flashcards in Gluteal Region and Posterior Thigh Deck (53):
1

The region that is posterior to the pelvis that is involved in extension, abduction, and medial and lateral rotation of the thigh

Gluteal Region

2

Group of muscles known as the hamstring that extend the thigh and flex the leg

Hamstrings

3

The most superficial of the gluteal muscles, largest and heaviest in gluteal region

Gluteus Maximus

4

Origin and insertion of gluteus maximus

Origin: Dorsal Ilium, Sacrum, Coxas, Sacrotuberous Ligament

Insertion: IT Band and Gluteal Tuberosity

5

Main action of the gluteus maximus

Extension and lateral rotation of the thigh

6

Innervation of the gluteus maximus

Inferior Gluteal Nerve

7

Gluteus Medius originates between what on the ala?

Posterior and anterior Line

8

Gluteus minimus originates between what on the ala?

Anterior and inferior Lines

9

Actions of the gluteus medius and minimus (locomotion

Abduct the thigh and medial rotation

Most important function is walking mechanism

10

What do the prevent happening during walking?

Sagging of the unsupported side for raising the unsupported foot

11

Origin of gluteus medius:

Insertion:

Origin: Between posterior and anterior gluteal lines side of ilium

Insertion Lateral aspect of greater trochanter

12

Origin of the gluteus minimus

Origin: Between anterior and inferior gluteal lines

Insertion: Anterior aspect of greater trochanter

13

Innervation of the gluteus medius and minimus

Superior Gluteal Nerve

14

When the gluteus medius and minimus are inactive owing to injury of the superior gluteal nerve, the supporting and steadying action of these muscles is lost and the pelvis falls to the side of the raised or unsupported limb. This is the

Trendelenberg Sign

15

Where do all of the lateral rotaters insert near or in?

Greater Trochanter

16

Lateral rotator that is narrow and triangular shaped and exits from the pelvis through the greater sciatic foramen

All other rotators are located inferior to the piriformis, sciatic nerve exits inferior.

Important for locating other structure

Piriformis

17

Origin and insertion of the piriformis

Origin: Anterior surface of the sacrum

Insertion: Greater trochanter

18

Innervation of the piriformis

Ventral rami of S1, S2, and L5

19

Action of the piriformis (primary and other action)

Lateral rotations and helps in abduction

20

The white tendon of this muscle is in the gluteal region, and the muscle is located inside the pelvis and exits the lesser sciatic foramen

Obturator Internus

21

Origin and insertion of the obturator internus

Origin: Obturator membrane in margins of obturator foramen

Insertion: Greater Trochanter

22

Innervation of the obturator internus

Ventral Rami of L5 and S1

23

Action of the obturator internus

Lateral rotation of the thigh

24

Muscles that insert into the obturator internus tendon that often cover the internus tendon

Gemullus superior and inferior

25

Origin and insertion of the superior gemellus

Origin: ischial spine

Insertion:Obturator internus tendon into greater trochanter

26

Origin and insertion of the inferior gemellus

Origin: Ischial Tuberosity

Insertion: Obturator internus tendon to greater trochanter

27

Innervation of the superior and inferior gemellus

Ventral Rami of L5 and S1

28

Action of superior gemellus and inferior gemellus

Lateral rotation

29

Square shaped muscle inferior to inferior gemellus

Quadratus femoris

30

Origin and insertion of the quadratus femoris

Ischial tuberosity

Greater trochanter and trochanteric crest

31

Innervation of the quadratus femoris

Ventral Rami of L5 and S1

32

What action is the quadratus femoris a strong participant in?

Lateral Rotation of the thigh

33

Muscle that arises from the outside of the pelvis anteriorly over the obturator foramen.

Obturator Externus

34

Origin and insertion of the obturator externus

Origin: Obturator foramen

Inserts: Trochanteric fossa of the femur

35

Innervation of the obturator externus

Obturator nerve (innervates adductor/medial compartment of the thigh)

36

Action of the obturator externus

Lateral rotation and stabilizing the femur in the acetabulum

37

Gluteomuscular injections occur because

The muscle is thick and large so it provides a large area for the absorption of drugs

be careful of sciatic nerve! Do it superiorly in upper outer quadrant

38

The 3 (or 4) muscles of the hamstrings

Biceps Femoris
Semimembranosus
Semitendinosus

39

Innervation of the hamstrings except the short head of the biceps femoris which is innervated by the common fibular nerve

Sciatic nerve

40

Laterally located muscle that has a long and short head.

Which head crosses the hip and knee joint?

Which head crosses only the knee joint?

Biceps femoris

Long head

Short head

41

Origin and insertion of the long head

Origin: Ischial tuberosity

Insertion:head of the fibula

42

Origin and insertion of the short head

Origin: Linea aspera

Insertion: head of the fibula

43

Innervation of short head and long head

Long head: sciatic

Short head: Common fibular

44

Action of long head

Action of short head

Extend the thigh and flex the knee

Flex the knee

45

Medially located muscle in the thigh with a long chord like tendon

Semitendinosus

46

Origin and insertion of the semitendinosus

Origin: Ischial tuberosity

Insertion: Medial side of tibia via pes anserinus

47

Innervation of the semitendinosus

Sciatic nerve

48

Action of the semitendinosus

Extension of the thigh and flexion of the knee, slight rotation too

49

`Muscle that lies deep to the semitendinosus, is a thicker muscle. Has a wide flat band of insertion

Semimembranosus

50

Origin and insertion of the semimembranosus

Origin: Ischial tuberosity

Insertion: Medial condyle of the tibia to form obliue popliteal ligament

51

What does the semimembranosus continue on to form?

Oblique popliteal ligament

52

Innervation of the semimembranosus

Sciatic nerve via tibial portion

53

Action of the semimembranosus

Extend the thigh, flex the knee, medial rotation (slight)