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lary nerve of the brachial plexus penetrate were seen under the FDP and descended in

through the outer border of the first rib to the front of the IM (Figure 16 and Table 3).
axilla. When dissecting deeper, the fibrous BLOA runs along the longitudinal ar-

capsule of the shoulder joint was found to rangement of the triceps brachii and could
overly the articular cartilage of the humeral be palpated in the volunteers. In the cadav-
head in the glenoid fossa (Figure 15 and Table 2). ers, BLOA was seen between the LaTB and

the LoTB by the fleshy parts to the tendons.
The BLs
When dissecting deeper at the proximal part

BLIF could be palpated at the line run- of this line, RN was found to pass inferolaterally
ning lateral to Bra and medially to FCR and into the radial groove with the PBA. At the
PL in the volunteers. In the cadavers, the BLIF groove, RN gives off branches to the LoTB

ran between the lateral border of Bra and the and the long slender branches then descend
medial border of FCR and PL at the superfi- through the medial head of the triceps to the
cial level. Deeper dissection at the neck of anconeus muscle (Table 3).

the radius in the cubital fossa showed BLIF BLOF runs along the origin to the ten-
was at the point of the brachial artery (BA) don of the ED and could be palpated in the
that divides into the radial and ulnar arteries. volunteers. At a superficial level in the ca-

At the intermediate level, the MN and its davers, BLOF could be mapped to the origin
branches pass through the deep surface of the to the tendon of the ED, where the RN rami-

FDS. Deeper dissection showed that the BLIF fies to supply the surrounding muscles. When
also corresponds to the AIA and the AIN which dissecting deeper, the PIN with the PIA

Table 3. The BLIF, BLOA, BLOF and the structures correlation in the cadavers.

Lines Muscles Vessels Nerves (N)

BLIF muscular origins to the tendons -brachial artery that divides -median (superficial level)
of the anterior compartment of into the radial and ulnar arteries -anterior interosseous
forearm (superficial level) (deep level)
-anterior interosseous
(deep level)
BLOA -triceps brachii profunda brachii radial
BLOF -extensor digitorum -posterior interosseous
(superficial level)
-supinator (deep level)