Thoracic Spinal Nerves Anatomy Quiz

Study Notes

Spinal Nerve Anatomy

The anterior ramus of the 1st thoracic (T1) spinal nerve bifurcates into a large superior and a small inferior part.
The superior part integrates with the brachial plexus, vital for upper limb innervation.
The inferior part becomes the 1st intercostal nerve.

Atypical Features of Intercostal Nerves

1st and 2nd intercostal nerves run along the internal surface of the 1st and 2nd ribs, differing from typical pathways through costal grooves.
The 1st intercostal nerve typically lacks an anterior cutaneous branch and may not have a lateral cutaneous branch.
When present, the lateral cutaneous branch of the 1st intercostal nerve innervates the axilla skin and may connect with the intercostobrachial nerve or the medial cutaneous nerve of the arm.

Intercostobrachial Nerve

The 2nd intercostal nerve provides a significant lateral cutaneous branch, called the intercostobrachial nerve.
The intercostobrachial nerve exits from the 2nd intercostal space at the midaxillary line (MAL) and travels into the axilla and arm.
It typically innervates the floor of the axilla and collaborates with the medial cutaneous nerve of the arm.

Thoraco-Abdominal Nerves

The 7th to 11th intercostal nerves, after branching laterally, extend across the costal margin to supply abdominal skin and muscles, transitioning from intercostal to thoraco-abdominal nerves.
Anterior cutaneous branches of these nerves penetrate the rectus sheath, indicating their role in abdominal wall innervation.

Description

Test your knowledge on the anatomy of the thoracic spinal nerves, focusing specifically on the 1st thoracic (T1) spinal nerve and its divisions into the intercostal nerves. This quiz covers atypical features and the connections of these nerves to the brachial plexus and upper limb. Perfect for students of anatomy and physiology.