Nerve roots of the long thoracic nerve

The video tutorial explains the role of the long thoracic nerve, which originates from the C5, C6, and C7 nerve roots of the brachial plexus. It supplies the serratus anterior muscle, enabling anterolateral movement of the scapula along the ribs. This movement allows us to raise our arms above 90 degrees, effectively lifting them 'to heaven.' The key takeaway is to remember the nerve roots C5, C6, and C7 for arm-raising functionality.

What is the primary role of the long thoracic nerve?

• To supply the deltoid muscle

• To supply the triceps muscle

• To supply the serratus anterior muscle

• To supply the biceps muscle

Which movement is facilitated by the contraction of the serratus anterior muscle?

• Anterolateral movement of the scapula

• Lateral movement of the arm

• Flexion of the elbow

• Extension of the wrist

What is the function of the serratus anterior muscle in relation to arm movement?

• It flexes the forearm

• It stabilizes the shoulder joint

• It assists in raising the arm above 90 degrees

• It helps in rotating the arm

From which nerve roots does the long thoracic nerve originate?

• C1, C2, C3

• C3, C4, C5

• C5, C6, C7

• C7, C8, T1

What is the mnemonic to remember the nerve roots of the long thoracic nerve?

• C345

• C123

• C789

• C567