Arm in Cross Section

by James Pickering, PhD

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    00:01 In this lecture, we're going to carry on looking at the upper limb and we're going to look at the arm.

    00:07 So, let's start off by looking at the cross-section of the arm.

    00:14 So, this is important as it helps us to compartmentalize the arm which is the superior aspect of the upper limb.

    00:21 It's not the forearm which is more inferiorly located.

    00:24 So, we're looking at the region around biceps and triceps.

    00:27 It's important though to look at the - in cross-sections to appreciate the compartments that are located.

    00:35 So, surrounding all the musculature within the arm, we have a tight layer of fascia, the brachial fascia and that lies deep to the subcutaneous tissue.

    00:47 We also have an important bone that runs through the arm and that is the humerus.

    00:52 You can see that in the middle of the diagram here.

    00:56 And then, running between the brachial fascia and the humerus, we have two intermuscular septums, the lateral and the medial.

    01:04 And this helps to separate the arm into two compartments.

    01:08 Here on the screen above, we have the anterior compartment.

    01:12 So, this arm has been cut as if you're laying supine on your bed and your arm has been cut in cross-section and then, you're looking at it by standing at the patient's feet.

    01:23 So, at the top of the screen, we can see the anterior compartment and then, at the bottom of the screen, we can see the posterior compartment.

    01:31 And you can see there, there are a number of muscles that have been indicated.

    01:35 So, anteriorly, we have biceps brachii and brachialis. We can also see a small muscle which is coracobrachialis.

    01:42 Posteriorly, we see triceps brachii and we can see within the intermuscular sector, we can see a number of nerve and blood vessels.

    01:51 We'll look at these muscles in much more detail moving forward.

    About the Lecture

    The lecture Arm in Cross Section by James Pickering, PhD is from the course Anatomy of the Arm.

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    Author of lecture Arm in Cross Section

     James Pickering, PhD

    James Pickering, PhD

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