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Transverse Section of Arm - Cadaveric Anatomy : Dr G Bhanu Prakash

In this video i have covered Transverse section midway between glenohumeral and elbow joints to show the compartments of the arm

Lets read narrative here
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Here is image of transverse section of arm.
Look at this thumb which is present on lateral aspect
Little finger is present on medial side which gives medial orientation. We can also appreciate medial and lateral epicondyles which are the bony landmarks
Let me show you the orientation to identify the structures seen. Just have look at the humerus (shaft). The posterior surface of humerus is flat and anterior is more like convex with tapering margin, which gives a triangular appearance.
Any cross section of the limb can be identified by taking bone as a reference. So, the bone helps to understand the orientation of the specimen.
This is the cross section which is taken below the midway between glenohumeral joint (shoulder joint) and elbow joint to show the compartments of the arm.
This cross section is just below the midway because the section is below the attachment of deltoid. As we know that, the deltoid attaches to deltoid tuberosity and coracobrachialis is on the medial aspect of shaft of humerus at the level of deltoid tuberosity. Absence of these two muscles explains that this section is taken just below the midway.
We can clearly demarcate anterior and posterior compartments with the help of intermuscular septa. Here is the medial intermuscular septum and this is the lateral intermuscular septum. Now we can tell that this is the anterior compartment and this one is the posterior compartment.
You can see the muscle adherent to shaft of the humerus on anterior surface and posterior surface as well.
The muscle which is adherent to anterior surface is brachialis. Brachialis gets origin from lower part of the anterior surface of shaft of the humerus. The muscle which is superficial to brachialis is biceps brachii. Biceps muscle has no attachment on the humerus as it gets origin from scapula and inserts into radius (radial tuberosity).
In the posterior compartment the muscle bulk is formed by triceps (medial head, lateral head and long head are seen). This section is taken at the radial groove/spiral groove which contains radial nerve and profunda brachii vessels which are in close association of shaft of humerus. Radial nerve lies close to lateral intermuscular septum. In its further course radial nerve pierces the lateral intermuscular septum to come forward towards the lateral side of arm
We can also appreciate a neurovascular bundle on anteromedial aspect which contains the median nerve along with brachial artery along with veins, more medially ulnar nerve is well demonstrated which lies on most medial aspect just behind the intermuscular septum.

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