Muscles of the Gluteal Region (Nursing)

by Darren Salmi, MD, MS

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    00:01 Now we can move on to what muscles are creating these movements.

    00:06 Now the first thing we're going to talk about are some things we actually introduced a long time ago when we were talking about the core when we were talking about the back.

    00:14 That's going to be some prominent hip flexors.

    00:18 So here we have a large muscle attaching to the lumbar vertebra called the psoas major.

    00:23 And another one sitting right in that depression of the iliac bone the ilium called the iliacus.

    00:30 And together there tend to be called the Iliopsoas because it kind of act as one muscle.

    00:37 And because they crossed the hip joint, they have an action at the hip joint and that action is hip flexion.

    00:43 So if we turn around to a lateral point of view, this is where we're going to find our hip abductors.

    00:50 Here we have a muscle with a funny name the tensor fascia latae.

    00:56 And tensor might give you an idea it's tensing something, and what does fascia latae mean? Well, it's this long flat band called the Iliotibial band.

    01:06 And that's why it gets its name because it has this unusually broad and flat connection that gets its own name iliotibial band.

    01:16 And that tells you a little bit about where it's going because we saw ilio what that's referring to.

    01:22 We haven't seen yet but we know that the tibia is something that must be further down, and it's going to be out in the leg, it's a bone called the tibia.

    01:33 If we zoom in a little bit closer, though, we're going to see some other ones in the lateral compartment that do quite a bit more.

    01:41 They also are going to do hip extension, as well as hip abduction and rotation.

    01:46 So they're doing a lot and these are some big muscles here.

    01:49 These are our gluteal muscles or glutes.

    01:53 The first and largest is the gluteus maximus.

    01:58 Next in size is the gluteus medius.

    02:01 And then the smallest one is going to be gluteus minimus.

    02:07 Now we'll rotate around to a posterior view and see the external rotators or lateral rotators.

    02:15 They're all lined up in a row in parallel to give you an idea that they're all kind of doing the same thing.

    02:21 The first is the piriformis.

    02:23 Then we have the superior gemellus, obturator internus, inferior gemellus, which looks a lot like superior gemellus because it comes from the word for twin like Gemini.

    02:37 Quadratus femoris, quadratus referring to its rectangular shape.

    02:43 And they're great because they are external rotators and that's a great motion to have.

    02:48 But they're also useful because there's some sacral nerves giving off important branches in this vicinity as well.

    02:56 So we see that there's something called the Pudendal nerve that's going off and supplying the area known as the perineum.

    03:03 Then we have the superior gluteal nerve, which is taking care of our gluteus medius and minimus.

    03:10 Then are inferior gluteal nerve that's taking care of our gluteus maximus.

    03:16 Then we have a self explanatory nerve, the posterior cutaneous nerve of the thigh.

    03:21 So that's going to provide our skin sensation in the posterior thigh.

    03:27 Which by the way, it's the same thing when we talked about arm and forearm, our lower limb has two components.

    03:33 It has a thigh from the hip to the knee, and then a leg from the knee down to the foot.

    03:40 So you're probably used to saying leg meaning everything below the hip.

    03:43 But for right now we're sticking with the anatomic terms of thigh and then beyond the knee is where we have the leg.

    03:52 Finally, we have this really big nerve that's going to go on all the way down for the rest of the lower limb called the sciatic nerve.

    04:00 And it's going to take care of most of the external rotators and most of our posterior thigh muscles.

    About the Lecture

    The lecture Muscles of the Gluteal Region (Nursing) by Darren Salmi, MD, MS is from the course Anatomy of the Musculoskeletal System (Nursing).

    Included Quiz Questions

    1. Psoas major
    2. Iliacus
    3. Iliopsoas
    4. Tensor fasciae latae
    5. Gluteus maximus
    1. Inferior gluteal nerve
    2. Superior gluteal nerve
    3. Pudendal nerve
    4. Sciatic nerve
    5. Posterior cutaneous nerve of the thigh

    Author of lecture Muscles of the Gluteal Region (Nursing)

     Darren Salmi, MD, MS

    Darren Salmi, MD, MS

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