Explains how the arm is divided into anterior and posterior osteofascial compartments by the intermuscular septa, and where the bicipital grooves and their superficial veins lie. Lists the structures passing through the medial septum and each groove, then covers the anterior region's surface, fascia, muscles and neurovascular bundle. Also describes the posterior compartment's skin, superior and inferior neurovascular bundles, and the radial canal with its boundaries and contents, with a labelled picture of the parts.
Topic 27 of 40 in the MU Sofia syllabus for Anatomy (Topographic) (Medicine, Year 2). The free AceMed note covers it in 3 sections, about 637 words (4 min of reading), with 15 flashcards.
In this note
THE ARM
Anterior Region :
Posterior Compartment :
THE ARM
257 +258
The arm is divided by the medial and lateral intermuscular septa into two osteofascial compartments: the anterior and posterior compartments of the arm. The medial and lateral bicipital grooves are located above the junctions of the medial and lateral intermuscular septa with the brachial fascia. Superficial veins run in both grooves and distally are joined by the cutaneous nerves of the forearm.
Parts
1 Anterior compartment of arm (compartimentum brachii anterius) – the anterior group of the arm muscles
2 Posterior compartment of arm (compartimentum brachii posterius) – the posterior group of the arm muscles
3 Medial intermuscular septum of arm – structures passing anteriorly:
3.1 Brachial vein and artery
3.2 Musculocutaneous nerve
3.3 Median nerve
3.4 Ulnar nerve (only in the proximal half of the arm)
4 Medial bicipital groove – contains:
4.1 Basilic vein
4.2 Medial cutaneous nerve of forearm
5 Lateral bicipital groove – passing superficially and ventral to it:
5.1 Cephalic vein
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