What Is the Musculocutaneous Nerve?
The musculocutaneous nerve (neck 5 to neck 7) starts from the lateral bundle of the brachial plexus, penetrates into the coracus brachialis, and descends between the biceps brachii and the brachialis muscle. The branches are distributed in the coracus brachii, biceps brachii and At the outer edge of the biceps tendon, it penetrates near the elbow and becomes the lateral cutaneous nerve of the forearm. Branches of the musculocutaneous nerve:
The musculocutaneous nerve (neck 5 to neck 7) starts from the lateral bundle of the brachial plexus, penetrates into the coracus brachialis, and descends between the biceps brachii and the brachialis muscle. The branches are distributed in the coracus brachii, biceps brachii and At the outer edge of the biceps tendon, it penetrates near the elbow and becomes the lateral cutaneous nerve of the forearm. Branches of the musculocutaneous nerve:
Branch of brachio-brachial muscle, 1 to 3 branches, of which 1 to 2 branches are more common. The first branch is mostly 4 to 6 cm below the midpoint of the clavicle. Most of the branches are single branches to the muscle.
Biceps brachii, 1 to 5 branches, of which 2 to 3 are more common. The first branch of this muscle is issued 10 to 15 cm below the midpoint of the clavicle. Each head has its own separate branch, several Those are rare. There is also a separate supply for extra heads.
Brachial muscle branch, 1 to 5 branches, of which 2 to 3 branches are more common. The first muscular branch is mostly divided at 14.0-22.5cm below the midpoint of the clavicle, which is the last muscle branch of the musculocutaneous nerve.
- Chinese name
- Musculocutaneous nerve
- Foreign name
- Cutaneous nerve
- Types of
- noun
- Field
- medicine
- Make up
- Nerve 5, 6, and 7 nerve fiber composition
Musculocutaneous nerve anatomy
Musculocutaneous neuromuscular nerve walking and variation
When the upper limb is abducted at 60 degrees, the distance from the origin of the musculocutaneous nerve (that is, the point emitted from the outside of the brachial plexus) to the coracoid process is (41.89 ± 13.55) mm, which has a large variation. After it is sent out, the trunk runs along the outside of the axillary artery. The majority of those who pass through the coracalis brachialis muscle pass through the coracoid muscle at a distance of (58.07 ± 38.74) mm from the coracoid process. The number of branches of the musculocutaneous nerve is more common than four, which respectively control the corac and brachial muscles, and the biceps brachii.
Measurement parameters | Minimum to maximum | x ± s |
Anteroposterior diameter | 0.16 3.00 | 1.97 ± 1.16 |
Left and right diameter | 2.22 4.48 | 3.21 ± 1.17 |
length | 8.88 105.92 | 50.07 ± 46.08 |
Starting position | 26.08 57.94 | 41.89 ± 13.55 |
First branch point position | 35.00 103.88 | 58.07 ± 38.74 |
Measurements of various parameters of the musculocutaneous nerve (mm)
Musculocutaneous nerve
There are communication branches in the upper limbs, all of which are from the musculocutaneous nerve to the median nerve. The differences in the diameters of the traffic branches were small, and both were smaller than the diameter of the trunk of the musculocutaneous nerve, and the lengths were significantly different (77.91 ± 32.09) mm.
Measurement parameters | Minimum to maximum | x ± s |
length | 61.46 99.38 | 77.91 ± 32.09 |
Starting diameter | 0.68 1.54 | 1.07 ± 0.71 |
End point diameter | 0.78 1.86 | 1.39 ± 0.91 |
Starting position | 91.60 129.40 | 112.56 ± 31.73 |
Measurement results of musculocutaneous nerve and median nerve branch (mm)
Myocutaneous nerve injury
Injury of the musculocutaneous nerve and its muscular branches can cause forearm flexion and weakness. In the past, the phrenic nerve, intercostal nerve, and branches of the brachial plexus were mostly used to coincide with the cutaneous nerve. According to clinical observations, simply repairing the biceps branch can meet the basic elbow flexion function. Therefore, the branch of the musculocutaneous nerve can be used as a graft to repair adjacent biceps brachii, and the lateral cutaneous nerve of the terminal forearm can be used as a graft to repair nerves in other parts, such as nerves.
